This is information on a product in full production.
October 2016 DocID025083 Rev 5 1/115
STM32F303x6/x8
ARM®Cortex®-M4 32b MCU+FPU, up to 64KB Flash, 16KB SRAM
2 ADCs, 3 DACs, 3 comp., op-amp 2.0 - 3.6 V
Datasheet - production data
Features
•Core: ARM® Cortex®-M4 32-bit CPU with FPU
(72 MHz max), single-cycle multiplication and
HW division, 90 DMIPS (from CCM), DSP
instruction
•Memories
– Up to 64 Kbytes of Flash memory
– 12 Kbytes of SRAM with HW parity check
– Routine booster: 4 Kbytes of SRAM on
instruction and data bus with HW parity
check (CCM)
•CRC calculation unit
•Reset and supply management
– Low-power modes: Sleep, Stop, Standby
–V
DD,VDDA voltage range: 2.0 to 3.6 V
– Power-on/Power-down reset (POR/PDR)
– Programmable voltage detector (PVD)
–V
BAT supply for RTC and backup registers
•Clock management
– 4 to 32 MHz crystal oscillator
– 32 kHz oscillator for RTC with calibration
– Internal 8 MHz RC (up to 64 MHz with PLL
option)
– Internal 40 kHz oscillator
•Up to 51 fast I/O ports, all mappable on
external interrupt vectors, several 5 V-tolerant
•Interconnect Matrix
•7-channel DMA controller
•Up to two ADC 0.20 µs (up to 21 channels) with
selectable resolution of 12/10/8/6 bits, 0 to
3.6 V conversion range, single-
ended/differential mode, separate analog
supply from 2.0 to 3.6 V
•Temperature sensor
•Up to three 12-bit DAC channels with analog
supply from 2.4 V to 3.6 V
•Three ultra-fast rail-to-rail analog comparators
with analog supply from 2 V to 3.6 V
•One operational amplifiers that can be used in
PGA mode, all terminals accessible with
analog supply from 2.4 to 3.6 V
•Up to 18 capacitive sensing channels
supporting touchkeys, linear and rotary touch
sensors
•Up to 11 timers
– One 32-bit timer and one 16-bit timer with
up to 4 IC/OC/PWM or pulse counter and
quadrature (incremental) encoder input
– One 16-bit 6-channel advanced-control
timer, with up to 6 PWM channels,
deadtime generation and emergency stop
– One 16-bit timer with 2 IC/OCs,
1 OCN/PWM, deadtime generation,
emergency stop
– Two 16-bit timers with IC/OC/OCN/PWM,
deadtime generation and emergency stop
– Two watchdog timers (independent,
window)
– SysTick timer: 24-bit downcounter
– Up to two 16-bit basic timers to drive DAC
•Calendar RTC with alarm, periodic wakeup
from Stop
•Communication interfaces
– CAN interface (2.0 B Active) and one SPI
–One I
2C with 20 mA current sink to support
Fast mode plus, SMBus/PMBus
– Up to 3 USARTs, one with ISO/IEC 7816
interface, LIN, IrDA, modem control
•Debug mode: serial wire debug (SWD), JTAG
LQFP32 (7 x 7 mm)
LQFP48 (7 x 7 mm)
LQFP64 (10 x 10 mm)
www.st.com
STM32F303x6/x8
2/115 DocID025083 Rev 5
•96-bit unique ID •All packages ECOPACK®2
Table 1. Device summary
Reference Part number
STM32F303x6 STM32F303K6/C6/R6
STM32F303x8 STM32F303K8/C8/R8
DocID025083 Rev 5 3/115
STM32F303x6/x8 Contents
5
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 ARM® Cortex®-M4 core with FPU with embedded Flash
and SRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.1 Embedded Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.2 Embedded SRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.3 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 Cyclic redundancy check calculation unit (CRC) . . . . . . . . . . . . . . . . . . . 14
3.4 Power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.1 Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.2 Power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4.4 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5 Interconnect matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.6 Clocks and startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.7 General-purpose inputs/outputs (GPIOs) . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.8 Direct memory access (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.9 Interrupts and events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.9.1 Nested vectored interrupt controller (NVIC) . . . . . . . . . . . . . . . . . . . . . . 19
3.9.2 Extended interrupt/event controller (EXTI) . . . . . . . . . . . . . . . . . . . . . . 19
3.10 Fast analog-to-digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.10.1 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.10.2 Internal voltage reference (VREFINT) . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.10.3 VBAT battery voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.10.4 OPAMP2 reference voltage (VOPAMP2) . . . . . . . . . . . . . . . . . . . . . . . . 21
3.11 Digital-to-analog converter (DAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.12 Operational amplifier (OPAMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.13 Ultra-fast comparators (COMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.14 Timers and watchdogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Contents STM32F303x6/x8
4/115 DocID025083 Rev 5
3.14.1 Advanced timer (TIM1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.14.2 General-purpose timers (TIM2, TIM3, TIM15, TIM16, TIM17) . . . . . . . . 23
3.14.3 Basic timers (TIM6 and TIM7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.14.4 Independent watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.14.5 Window watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.14.6 SysTick timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.15 Real-time clock (RTC) and backup registers . . . . . . . . . . . . . . . . . . . . . . 24
3.16 Communication interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.16.1 Inter-integrated circuit interface (I2C) . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.16.2 Universal synchronous / asynchronous
receivers / transmitters (USARTs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.16.3 Serial peripheral interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.16.4 Controller area network (CAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.17 Infrared transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.18 Touch sensing controller (TSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.19 Development support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.19.1 Serial wire JTAG debug port (SWJ-DP) . . . . . . . . . . . . . . . . . . . . . . . . . 30
4 Pinout and pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5 Memory mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1 Parameter conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1.1 Minimum and maximum values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1.2 Typical values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1.3 Typical curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1.4 Loading capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1.5 Input voltage on a pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1.6 Power-supply scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1.7 Measurement of the current consumption . . . . . . . . . . . . . . . . . . . . . . . 46
6.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.3 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.3.1 General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.3.2 Operating conditions at power-up / power-down . . . . . . . . . . . . . . . . . . 50
6.3.3 Characteristics of the embedded reset and power-control block . . . . . . 50
6.3.4 Embedded reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
DocID025083 Rev 5 5/115
STM32F303x6/x8 Contents
5
6.3.5 Supply current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.3.6 Wakeup time from low-power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.3.7 External clock source characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.3.8 Internal clock source characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.3.9 PLL characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
6.3.10 Memory characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
6.3.11 EMC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
6.3.12 Electrical sensitivity characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
6.3.13 I/O current injection characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
6.3.14 I/O port characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
6.3.15 NRST pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
6.3.16 Timer characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.3.17 Communication interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
6.3.18 ADC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6.3.19 DAC electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
6.3.20 Comparator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
6.3.21 Operational amplifier characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
6.3.22 Temperature sensor (TS) characteristics . . . . . . . . . . . . . . . . . . . . . . . 100
6.3.23 VBAT monitoring characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
7.1 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
7.2 LQFP32 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
7.3 LQFP48 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
7.4 LQFP64 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
7.5 Thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111
7.5.1 Reference document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
7.5.2 Selecting the product temperature range . . . . . . . . . . . . . . . . . . . . . . 111
8 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
List of tables STM32F303x6/x8
6/115 DocID025083 Rev 5
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table 2. STM32F303x6/8 family device features and peripherals count . . . . . . . . . . . . . . . . . . . . . 11
Table 3. VDDA ranges for analog peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 4. STM32F303x6/8 peripheral interconnect matrix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 5. Timer feature comparison. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 6. Comparison of I2C analog and digital filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 7. STM32F303x6/8 I2C implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 8. USART features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 9. STM32F303x6/8 SPI implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 10. Capacitive sensing GPIOs available on STM32F303x6/8 devices. . . . . . . . . . . . . . . . . . . 28
Table 11. Capacitive sensing GPIO available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 12. No. of capacitive sensing channels available on STM32F303x6/8 devices . . . . . . . . . . . . 30
Table 13. Legend/abbreviations used in the pinout table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 14. STM32F303x6/8 pin definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 15. Alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 16. STM32F303x6/8 peripheral register boundary addresses . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 17. Voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 18. Current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 19. Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 20. General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 21. Operating conditions at power-up / power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 22. Embedded reset and power control block characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 23. Programmable voltage detector characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 24. Embedded internal reference voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 25. Internal reference voltage calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 26. Typical and maximum current consumption from VDD supply at VDD = 3.6V . . . . . . . . . . . 53
Table 27. Typical and maximum current consumption from the VDDA supply . . . . . . . . . . . . . . . . . . 54
Table 28. Typical and maximum VDD consumption in Stop and Standby modes. . . . . . . . . . . . . . . . 54
Table 29. Typical and maximum VDDA consumption in Stop and Standby modes. . . . . . . . . . . . . . . 55
Table 30. Typical and maximum current consumption from VBAT supply. . . . . . . . . . . . . . . . . . . . . . 55
Table 31. Typical current consumption in Run mode, code with data processing
running from Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 32. Typical current consumption in Run mode, code with data processing
running from Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 33. Typical current consumption in Sleep mode, code running from Flash or RAM. . . . . . . . . 59
Table 34. Switching output I/O current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 35. Peripheral current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 36. Low-power mode wakeup timings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 37. Wakeup time using USART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 38. High-speed external user clock characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 39. Low-speed external user clock characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 40. HSE oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Table 41. LSE oscillator characteristics (fLSE = 32.768 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 42. HSI oscillator characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 43. LSI oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 44. PLL characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 45. Flash memory characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Table 46. Flash memory endurance and data retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
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STM32F303x6/x8 List of tables
7
Table 47. EMS characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Table 48. EMI characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 49. ESD absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 50. Electrical sensitivities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 51. I/O current injection susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 52. I/O static characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 53. Output voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table 54. I/O AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 55. NRST pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Table 56. TIMx characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Table 57. IWDG min./max. timeout period at 40 kHz (LSI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Table 58. WWDG min./max. timeout value at 72 MHz (PCLK). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Table 59. I2C analog filter characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Table 60. SPI characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Table 61. ADC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Table 62. Maximum ADC RAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 63. ADC accuracy - limited test conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Table 64. ADC accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Table 65. ADC accuracy at 1MSPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table 66. DAC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table 67. Comparator characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table 68. Operational amplifier characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Table 69. Temperature sensor (TS) characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Table 70. Temperature sensor (TS) calibration values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Table 71. VBAT monitoring characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Table 72. LQFP32 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Table 73. LQFP48 package mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Table 74. LQFP64 package mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Table 75. Package thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Table 76. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Table 77. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
List of figures STM32F303x6/x8
8/115 DocID025083 Rev 5
List of figures
Figure 1. STM32F303x6/8 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 2. Clock tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 3. Infrared transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 4. LQFP32 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 5. LQFP48 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 6. LQFP64 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 7. STM32F303x6/8 memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 8. Pin loading conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 9. Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 10. Power-supply scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 11. Scheme of the current-consumption measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 12. Typical VBAT current consumption (LSE and RTC ON/LSEDRV[1:0] = ’00’) . . . . . . . . . . . 56
Figure 13. High-speed external clock source AC timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Figure 14. Low-speed external clock source AC timing diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 15. Typical application with an 8 MHz crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 16. Typical application with a 32.768 kHz crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Figure 17. HSI oscillator accuracy characterization results for soldered parts . . . . . . . . . . . . . . . . . . 70
Figure 18. TC and TTa I/O input characteristics - CMOS port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Figure 19. TC and TTa I/O input characteristics - TTL port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Figure 20. 5V- tolerant (FT and FTf) I/O input characteristics - CMOS port . . . . . . . . . . . . . . . . . . . . 77
Figure 21. 5V-tolerant (FT and FTf) I/O input characteristics - TTL port . . . . . . . . . . . . . . . . . . . . . . . 77
Figure 22. I/O AC characteristics definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Figure 23. Recommended NRST pin protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Figure 24. SPI timing diagram - slave mode and CPHA = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 25. SPI timing diagram - slave mode and CPHA = 1(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 26. SPI timing diagram - master mode(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 27. ADC typical current consumption in single-ended and differential modes . . . . . . . . . . . . . 88
Figure 28. ADC accuracy characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Figure 29. Typical connection diagram using the ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Figure 30. 12-bit buffered /non-buffered DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Figure 31. Maximum VREFINT scaler startup time from power-down . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Figure 32. OPAMP Voltage Noise versus Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure 33. LQFP32 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Figure 34. Recommended footprint for the LQFP32 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Figure 35. LQFP32 marking example (package top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Figure 36. LQFP48 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Figure 37. Recommended footprint for the LQFP48 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Figure 38. LQFP48 marking example (package top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Figure 39. LQFP64 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Figure 40. Recommended footprint for the LQFP64 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Figure 41. LQFP64 marking example (package top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
DocID025083 Rev 5 9/115
STM32F303x6/x8 Introduction
43
1 Introduction
This datasheet provides the ordering information and the mechanical device characteristics
of the STM32F303x6/8 microcontrollers.
This document should be read in conjunction with the STM32F303xx, STM32F358xx and
STM32F328xx advanced ARM®-based 32-bit MCUs reference manual (RM00316)
available from the STMicroelectronics website www.st.com.
For information on the Cortex®-M4 core with FPU, refer to:
•ARM® Cortex®-M4 Processor Technical Reference Manual available from the
www.arm.com website.
•STM32F3xxx and STM32F4xxx Cortex®-M4 programming manual (PM0214) available
from the www.st.com website.
Description STM32F303x6/x8
10/115 DocID025083 Rev 5
2 Description
The STM32F303x6/8 family incorporates the high-performance ARM® Cortex®-M4 32-bit
RISC core operating at up to 72 MHz frequency embedding a floating point unit (FPU),
high-speed embedded memories (up to 64 Kbytes of Flash memory, 12 Kbytes of SRAM),
and an extensive range of enhanced I/Os and peripherals connected to two APB buses.
The STM32F303x6/8 microcontrollers offer up to two fast 12-bit ADCs (5 Msps), up to three
ultra-fast comparators, an operational amplifier, three DAC channels, a low-power RTC, one
general-purpose, 32-bit timer, one timer dedicated to motor control, and four
general-purpose, 16-bit timers. They also feature standard and advanced communication
interfaces: one I2C, one SPI, up to three USARTs and one CAN.
The STM32F303x6/8 family operates in the –40 to +85 °C and –40 to +105 °C temperature
ranges from a 2.0 to 3.6 V power supply. A comprehensive set of power-saving modes
allows the design of low-power applications.
The STM32F303x6/8 family offers devices in 32, and 64-pin packages.
Depending on the device chosen, different sets of peripherals are included.
DocID025083 Rev 5 11/115
STM32F303x6/x8 Description
43
Table 2. STM32F303x6/8 family device features and peripherals count
Peripheral STM32F303Kx STM32F303Cx STM32F303Rx
Flash (Kbytes) 32 64 32 64 32 64
SRAM on data bus (Kbytes) 12
Core coupled memory SRAM on
instruction bus (CCM SRAM) (Kbytes) 4
Timers
Advanced control 1 (16-bit)
General purpose 4 (16-bit)
1 (32 bit)
Basic 2 (16-bit)
SysTick timer 1
Watchdog timers
(independent,
window)
2
PWM channels
(all)(1) 20 22 22
PWM channels
(except
complementary)
14 16 16
Comm. interfaces
SPI 1
I2C1
USART 2 3 3
CAN 1
GPIOs
Normal I/Os (TC,
TTa) 10 20 26
5-Volt tolerant I/Os
(FT,FTf) 15 17 25
Capacitive sensing channels 14 17 18
DMA channels 7
12-bit ADCs
Number of channels
2
9
2
15
2
21
12-bit DAC channels 3
Ultra-fast analog comparator 2 3
Operational amplifiers 1
CPU frequency 72 MHz
Operating voltage 2.0 to 3.6 V
Operating temperature Ambient operating temperature: - 40 to 85 °C / - 40 to 105 °C
Junction temperature: - 40 to 125 °C
Packages LQFP32 LQFP48 LQFP64
1. This total considers also the PWMs generated on the complementary output channels.
Description STM32F303x6/x8
12/115 DocID025083 Rev 5
Figure 1. STM32F303x6/8 block diagram
1. AF: alternate function on I/O pins.
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DocID025083 Rev 5 13/115
STM32F303x6/x8 Functional overview
43
3 Functional overview
3.1 ARM® Cortex®-M4 core with FPU with embedded Flash
and SRAM
The ARM Cortex-M4 processor with FPU is the latest generation of ARM processors for
embedded systems. It has been developed to provide a low-cost platform that meets the
needs of MCU implementation, with a reduced pin count and low-power consumption, while
delivering outstanding computational performance and an advanced response to interrupts.
The ARM 32-bit Cortex-M4 RISC processor with FPU features exceptional code-efficiency,
delivering the high performance expected from an ARM core, with memory sizes usually
associated with 8- and 16-bit devices.
The processor supports a set of DSP instructions which allows efficient signal processing
and complex algorithm execution.
Its single precision FPU speeds up software development by using metalanguage
development tools, while avoiding saturation.
With its embedded ARM core, the STM32F303x6/8 family is compatible with all ARM tools
and software.
Figure 1 shows the general block diagram of the STM32F303x6/8 family devices.
3.2 Memories
3.2.1 Embedded Flash memory
All STM32F303x6/8 devices feature up to 64 Kbytes of embedded Flash memory available
for storing programs and data. The Flash memory access time is adjusted to the CPU clock
frequency (0 wait state from 0 to 24 MHz, 1 wait state from 24 to 48 MHz and 2 wait states
above).
3.2.2 Embedded SRAM
The STM32F303x6/8 devices feature 12 Kbytes of embedded SRAM with hardware parity
check. The memory can be accessed in read/write at CPU clock speed with 0 wait states,
allowing the CPU to achieve 90 Dhrystone Mips at 72 MHz when running code from CCM
(core coupled memory) RAM.
The SRAM is organized as follows:
•4 Kbytes of SRAM on instruction and data bus with parity check (core coupled memory
or CCM) and used to execute critical routines or to access data
•12 Kbytes of SRAM with parity check mapped on the data bus.
Functional overview STM32F303x6/x8
14/115 DocID025083 Rev 5
3.2.3 Boot modes
At startup, BOOT0 pin and BOOT1 option bit are used to select one of the three boot
options:
•Boot from user Flash memory
•Boot from System Memory
•Boot from embedded SRAM
The boot loader is located in System Memory. It is used to reprogram the Flash memory by
using USART1 (PA9/PA10), USART2 (PA2/PA3), I2C1 (PB6/PB7).
3.3 Cyclic redundancy check calculation unit (CRC)
The CRC (cyclic redundancy check) calculation unit is used to get a CRC code using a
configurable generator polynomial value and size.
Among other applications, CRC-based techniques are used to verify data transmission or
storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a means of
verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of
the software during runtime, to be compared with a reference signature generated at link-
time and stored at a given memory location.
3.4 Power management
3.4.1 Power supply schemes
•VSS, VDD = 2.0 to 3.6 V: external power supply for I/Os and the internal regulator. It is
provided externally through VDD pins.
•VSSA, VDDA = 2.0 to 3.6 V: external analog power supply for ADC, DACs, comparators
operational amplifiers, reset blocks, RCs and PLL.The minimum voltage to be applied
to VDDA differs from one analog peripherals to another. See the Table 3 below,
summarizing the VDDA ranges for analog peripherals. The VDDA voltage level must be
always greater or equal to the VDD voltage level and must be provided first.
•VDD18 = 1.65 to 1.95 V (VDD18 domain): power supply for digital core, SRAM and Flash
memory. VDD18 is internally generated through an internal voltage regulator.
•VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and
backup registers (through power switch) when VDD is not present.
3.4.2 Power supply supervisor
The device has an integrated power-on reset (POR) and power-down reset (PDR) circuits.
They are always active, and ensure proper operation above a threshold of 2 V. The device
Table 3. VDDA ranges for analog peripherals
Analog peripheral Min VDDAsupply Max VDDAsupply
ADC/COMP 2 V 3.6 V
DAC/OPAMP 2.4 V 3.6 V
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STM32F303x6/x8 Functional overview
43
remains in reset mode when the monitored supply voltage is below a specified threshold,
VPOR/PDR, without the need for an external reset circuit.
•The POR monitors only the VDD supply voltage. During the startup phase it is required
that VDDA should arrive first and be greater than or equal to VDD.
•The PDR monitors both the VDD and VDDA supply voltages, however the VDDA power
supply supervisor can be disabled (by programming a dedicated Option bit) to reduce
the power consumption if the application design ensures that VDDA is higher than or
equal to VDD.
The device features an embedded programmable voltage detector (PVD) that monitors the
VDD power supply and compares it to the VPVD threshold. An interrupt can be generated
when VDD drops below the VPVD threshold and/or when VDD is higher than the VPVD
threshold. The interrupt service routine can then generate a warning message and/or put
the MCU into a safe state. The PVD is enabled by software.
3.4.3 Voltage regulator
The regulator has three operation modes: main (MR), low-power (LPR), and power-down.
•The MR mode is used in the nominal regulation mode (Run)
•The LPR mode is used in Stop mode.
•The power-down mode is used in Standby mode: the regulator output is in high
impedance, and the kernel circuitry is powered down thus inducing zero consumption.
The voltage regulator is always enabled after reset. It is disabled in Standby mode.
3.4.4 Low-power modes
The STM32F303x6/8 supports three low-power modes to achieve the best compromise
between low power consumption, short startup time and available wakeup sources:
•Sleep mode
In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can
wake up the CPU when an interrupt/event occurs.
•Stop mode
Stop mode achieves the lowest power consumption while retaining the content of
SRAM and registers. All clocks in the 1.8 V domain are stopped, the PLL, the HSI RC
and the HSE crystal oscillators are disabled. The voltage regulator can also be put
either in normal or in low-power mode.
The device can be woken up from Stop mode by any of the EXTI line. The EXTI line
source can be one of the 16 external lines, the PVD output, the RTC alarm, COMPx,
I2C or USARTx.
•Standby mode
The Standby mode is used to achieve the lowest power consumption. The internal
voltage regulator is switched off so that the entire 1.8 V domain is powered off. The
PLL, the HSI RC and the HSE crystal oscillators are also switched off. After entering
Standby mode, SRAM and register contents are lost except for registers in the Backup
domain and Standby circuitry.
The device exits Standby mode when an external reset (NRST pin), an IWDG reset, a
rising edge on the WKUP pin, or an RTC alarm occurs.
Note: The RTC, the IWDG, and the corresponding clock sources are not stopped by entering Stop
or Standby mode.
Functional overview STM32F303x6/x8
16/115 DocID025083 Rev 5
3.5 Interconnect matrix
Several peripherals have direct connections between them. This allows autonomous
communication between peripherals, saving CPU resources thus power supply
consumption. In addition, these hardware connections allow fast and predictable latency.
Note: For more details about the interconnect actions, refer to the corresponding sections in the
RM0364 reference manual.
3.6 Clocks and startup
System clock selection is performed on startup, however the internal RC 8 MHz oscillator is
selected as default CPU clock on reset. An external 4-32 MHz clock can be selected, in
which case it is monitored for failure. If failure is detected, the system automatically switches
back to the internal RC oscillator. A software interrupt is generated if enabled. Similarly, full
interrupt management of the PLL clock entry is available when necessary (for example with
failure of an indirectly used external oscillator).
Several prescalers allow to configure the AHB frequency, the high-speed APB (APB2) and
the low-speed APB (APB1) domains. The maximum frequency of the AHB and the
Table 4. STM32F303x6/8 peripheral interconnect matrix
Interconnect source Interconnect
destination Interconnect action
TIMx
TIMx Timers synchronization or chaining
ADCx
DACx Conversion triggers
DMA Memory to memory transfer trigger
COMPx Comparator output blanking
COMPx TIMx Timer input: ocrefclear input, input capture
ADCx TIM1 Timer triggered by analog watchdog
GPIO
RTCCLK
HSE/32
MC0
TIM16 Clock source used as input channel for HSI and
LSI calibration
CSS
CPU (hard fault)
RAM (parity error)
COMPx
PVD
GPIO
TIM1
TIM15, 16, 17 Timer break
GPIO
TIMx External trigger, timer break
ADCx
DACx Conversion external trigger
DACx COMPx Comparator inverting input
DocID025083 Rev 5 17/115
STM32F303x6/x8 Functional overview
43
high-speed APB domains is 72 MHz, while the maximum allowed frequency of the low-
speed APB domain is 36 MHz.
TIM1 maximum frequency is 144 MHz.
Functional overview STM32F303x6/x8
18/115 DocID025083 Rev 5
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DocID025083 Rev 5 19/115
STM32F303x6/x8 Functional overview
43
3.7 General-purpose inputs/outputs (GPIOs)
Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as
input (with or without pull-up or pull-down) or as peripheral alternate function. Most of the
GPIO pins are shared with digital or analog alternate functions. All GPIOs are high current
capable except for analog inputs.
The I/Os alternate function configuration can be locked if needed, following a specific
sequence to avoid spurious writing to the I/Os registers.
Fast I/O handling allows I/O toggling up to 36 MHz.
3.8 Direct memory access (DMA)
The flexible general-purpose DMA is able to manage memory-to-memory, peripheral-to-
memory and memory-to-peripheral transfers. The DMA controller supports circular buffer
management, avoiding the generation of interrupts when the controller reaches the end of
the buffer.
Each of the 7 DMA channels is connected to dedicated hardware DMA requests, with
software trigger support for each channel. Configuration is done by software and transfer
sizes between source and destination are independent.
The DMA can be used with the main peripherals: SPI, I2C, USART, general-purpose timers,
DAC and ADC.
3.9 Interrupts and events
3.9.1 Nested vectored interrupt controller (NVIC)
The STM32F303x6/8 devices embed a nested vectored interrupt controller (NVIC) able to
handle up to 60 interrupt channels, that can be masked and 16 priority levels.
The NVIC benefits are the following:
•Closely coupled NVIC gives low latency interrupt processing
•Interrupt entry vector table address passed directly to the core
•Closely coupled NVIC core interface
•Allows early processing of interrupts
•Processing of late arriving higher priority interrupts
•Support for tail chaining
•Processor state automatically saved
•Interrupt entry restored on interrupt exit with no instruction overhead
The NVIC hardware block provides flexible interrupt management features with minimal
interrupt latency.
3.9.2 Extended interrupt/event controller (EXTI)
The external interrupt/event controller consists of 27 edge detector lines used to generate
interrupt/event requests and wake-up the system. Each line can be independently
configured to select the trigger event (rising edge, falling edge, both) and can be masked
Functional overview STM32F303x6/x8
20/115 DocID025083 Rev 5
independently. A pending register maintains the status of the interrupt requests. The EXTI
can detect an external line with a pulse width shorter than the internal clock period. Up to 51
GPIOs can be connected to the 16 external interrupt lines.
3.10 Fast analog-to-digital converter (ADC)
Two 5 MSPS fast analog-to-digital converters, with selectable resolution between 12 and 6
bit, are embedded in the STM32F303x6/8 family devices. The ADCs have up to 21 external
channels. Some of the external channels are shared between ADC1 and ADC2, performing
conversions in single-shot or scan modes. The channels can be configured to be either
single-ended input or differential input. In scan mode, automatic conversion is performed on
a selected group of analog inputs.
The ADCs also have internal channels: temperature sensor connected to ADC1 channel 16,
VBAT/2 connected to ADC1 channel 17, voltage reference VREFINT connected to both ADC1
and ADC2 channel 18 and VOPAMP2 connected to ADC2 channel 17.
Additional logic functions embedded in the ADC interface allow:
•Simultaneous sample and hold
•Interleaved sample and hold
•Single-shunt phase current reading techniques.
Three analog watchdogs are available per ADC. The ADC can be served by the DMA
controller.
The analog watchdog feature allows very precise monitoring of the converted voltage of
one, some or all selected channels. An interrupt is generated when the converted voltage is
outside the programmed thresholds.
The events generated by the general-purpose timers (TIM2, TIM3, TIM6, TIM15) and the
advanced-control timer (TIM1) can be internally connected to the ADC start trigger and
injection trigger, respectively, to allow the application to synchronize A/D conversion and
timers.
3.10.1 Temperature sensor
The temperature sensor (TS) generates a voltage VSENSE that varies linearly with
temperature.
The temperature sensor is internally connected to the ADC1_IN16 input channel which is
used to convert the sensor output voltage into a digital value.
The sensor provides good linearity but it has to be calibrated to obtain good overall
accuracy of the temperature measurement. As the offset of the temperature sensor varies
from chip to chip due to process variation, the uncalibrated internal temperature sensor is
suitable for applications that detect temperature changes only.
To improve the accuracy of the temperature sensor measurement, each device is
individually factory-calibrated by ST. The temperature sensor factory calibration data are
stored by ST in the system memory area, accessible in read-only mode.
3.10.2 Internal voltage reference (VREFINT)
The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the
ADC and Comparators. VREFINT is internally connected to the ADC1_IN18 and ADC2_IN18
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STM32F303x6/x8 Functional overview
43
input channels. The precise voltage of VREFINT is individually measured for each part by ST
during production test and stored in the system memory area. It is accessible in read-only
mode.
3.10.3 VBAT battery voltage monitoring
This embedded hardware feature allows the application to measure the VBAT battery voltage
using the internal ADC channel ADC1_IN17. As the VBAT voltage may be higher than VDDA,
and thus outside the ADC input range, the VBAT pin is internally connected to a bridge
divider by 2. As a consequence, the converted digital value is half the VBAT voltage.
3.10.4 OPAMP2 reference voltage (VOPAMP2)
OPAMP2 reference voltage can be measured using ADC2 internal channel 17.
3.11 Digital-to-analog converter (DAC)
One 12-bit buffered DAC channel (DAC1_OUT1) and two 12-bit unbuffered DAC channels
(DAC1_OUT2 and DAC2_OUT1) can be used to convert digital signals into analog voltage
signal outputs. The chosen design structure is composed of integrated resistor strings and
an amplifier in inverting configuration.
This digital interface supports the following features:
•Three DAC output channels
•8-bit or 12-bit monotonic output
•Left or right data alignment in 12-bit mode
•Synchronized update capability
•Noise-wave generation (only on DAC1)
•Triangular-wave generation (only on DAC1)
•Dual DAC channel independent or simultaneous conversions
•DMA capability for each channel
•External triggers for conversion
3.12 Operational amplifier (OPAMP)
The STM32F303x6/8 embeds an operational amplifier (OPAMP2) with external or internal
follower routing and PGA capability (or even amplifier and filter capability with external
components). When an operational amplifier is selected, an external ADC channel is used
to enable output measurement.
The operational amplifier features:
•8 MHz GBP
•0.5 mA output capability
•Rail-to-rail input/output
•In PGA mode, the gain can be programmed to 2, 4, 8 or 16.
Functional overview STM32F303x6/x8
22/115 DocID025083 Rev 5
3.13 Ultra-fast comparators (COMP)
The STM32F303x6/8 devices embed three ultra-fast rail-to-rail comparators (COMP2/4/6)
which offer the features below:
•Programmable internal or external reference voltage
•Selectable output polarity.
The reference voltage can be one of the following:
•External I/O
•DAC output
•Internal reference voltage or submultiple (1/4, 1/2, 3/4). Refer to Table 24: Embedded
internal reference voltage for values and parameters of the internal reference voltage.
All comparators can wake up from STOP mode, generate interrupts and breaks for the
timers.
3.14 Timers and watchdogs
The STM32F303x6/8 includes advanced control timer, 5 general-purpose timers, basic
timer, two watchdog timers and a SysTick timer. The table below compares the features of
the advanced control, general purpose and basic timers.
Table 5. Timer feature comparison
Timer type Timer Counter
resolution
Counter
type
Prescaler
factor
DMA
request
generation
Capture/
compare
Channels
Complementary
outputs
Advanced
control TIM1(1) 16-bit Up, Down,
Up/Down
Any integer
between 1
and 65536
Yes 4 Yes
General-
purpose TIM2 32-bit Up, Down,
Up/Down
Any integer
between 1
and 65536
Yes 4 No
General-
purpose TIM3 16-bit Up, Down,
Up/Down
Any integer
between 1
and 65536
Yes 4 No
General-
purpose TIM15 16-bit Up
Any integer
between 1
and 65536
Yes 2 1
General-
purpose
TIM16,
TIM17 16-bit Up
Any integer
between 1
and 65536
Yes 1 1
Basic TIM6, TIM7 16-bit Up
Any integer
between 1
and 65536
Yes 0 No
1. TIM1 can be clocked from the PLL x 2 running at up to 144 MHz when the system clock source is the PLL and AHB or
APB2 subsystem clocks are not divided by more than 2 cumulatively.
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STM32F303x6/x8 Functional overview
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3.14.1 Advanced timer (TIM1)
The advanced-control timer can be seen as a three-phase PWM multiplexed on 6 channels.
They have complementary PWM outputs with programmable inserted dead-times. They can
also be seen as complete general-purpose timers. The 4 independent channels can be
used for:
•Input capture
•Output compare
•PWM generation (edge or center-aligned modes) with full modulation capability
(0-100%)
•One-pulse mode output
In debug mode, the advanced-control timer counter can be frozen and the PWM outputs
disabled to turn off any power switches driven by these outputs.
Many features are shared with those of the general-purpose TIM timers (described in
Section 3.14.2 using the same architecture, so the advanced-control timers can work
together with the TIM timers via the Timer Link feature for synchronization or event chaining.
3.14.2 General-purpose timers (TIM2, TIM3, TIM15, TIM16, TIM17)
There are up to three general-purpose timers embedded in the STM32F303x6/8 (see
Table 5 for differences), that can be synchronized. Each general-purpose timer can be used
to generate PWM outputs, or act as a simple time base.
•TIM2 and TIM3
They are full-featured general-purpose timers:
– TIM2 has a 32-bit auto-reload up/down counter and 32-bit prescaler
– TIM3 has a 16-bit auto-reload up/down counter and 16-bit prescaler
These timers feature four independent channels for input capture/output compare,
PWM or one-pulse mode output. They can work together, or with the other general-
purpose timers via the Timer Link feature for synchronization or event chaining.
The counters can be frozen in debug mode.
All have independent DMA request generation and support quadrature encoders.
•TIM15, 16 and 17
They are three general-purpose timers with mid-range features.
They have 16-bit auto-reload upcounters and 16-bit prescalers.
– TIM15 has two channels and one complementary channel
– TIM16 and TIM17 have one channel and one complementary channel
All channels can be used for input capture/output compare, PWM or one-pulse mode
output.
The timers can work together via the Timer Link feature for synchronization or event
chaining. The timers have independent DMA request generation.
The counters can be frozen in debug mode.
3.14.3 Basic timers (TIM6 and TIM7)
The basic timers are mainly used for DAC trigger generation. They can also be used as
generic 16-bit timebases.
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24/115 DocID025083 Rev 5
3.14.4 Independent watchdog
The independent watchdog is based on a 12-bit downcounter and 8-bit prescaler. It is
clocked from an independent 40 kHz internal RC and as it operates independently from the
main clock, it can operate in Stop and Standby modes. It can be used either as a watchdog
to reset the device when a problem occurs, or as a free running timer for application timeout
management. It is hardware or software configurable through the option bytes. The counter
can be frozen in debug mode.
3.14.5 Window watchdog
The window watchdog is based on a 7-bit downcounter that can be set as free running. It
can be used as a watchdog to reset the device when a problem occurs. It is clocked from
the main clock. It has an early warning interrupt capability and the counter can be frozen in
debug mode.
3.14.6 SysTick timer
This timer is dedicated to real-time operating systems, but could also be used as a standard
down counter. It features:
•A 24-bit down counter
•Autoreload capability
•Maskable system interrupt generation when the counter reaches 0.
•Programmable clock source
3.15 Real-time clock (RTC) and backup registers
The RTC and the 5 backup registers are supplied through a switch that takes power from
either the VDD supply when present or the VBAT pin. The backup registers are five 32-bit
registers used to store 20 bytes of user application data when VDD power is not present.
They are not reset by a system or power reset, or when the device wakes up from Standby
mode.
The RTC is an independent BCD timer/counter. It supports the following features:
•Calendar with subsecond, seconds, minutes, hours (12 or 24 format), week day, date,
month, year, in BCD (binary-coded decimal) format.
•Reference clock detection: a more precise second source clock (50 or 60 Hz) can be
used to enhance the calendar precision.
•Automatic correction for 28, 29 (leap year), 30, and 31 days of the month.
•Two programmable alarms with wake up from Stop and Standby mode capability.
•On-the-fly correction from 1 to 32767 RTC clock pulses. This can be used to
synchronize it with a master clock.
•Digital calibration circuit with 1 ppm resolution, to compensate for quartz crystal
inaccuracy.
•Two anti-tamper detection pins with programmable filter. The MCU can be woken up
from Stop and Standby modes on tamper event detection.
•Timestamp feature which can be used to save the calendar content. This function can
be triggered by an event on the timestamp pin, or by a tamper event. The MCU can be
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STM32F303x6/x8 Functional overview
43
woken up from Stop and Standby modes on timestamp event detection.
•17-bit Auto-reload counter for periodic interrupt with wakeup from STOP/STANDBY
capability.
The RTC clock sources can be:
•A 32.768 kHz external crystal
•A resonator or oscillator
•The internal low-power RC oscillator (typical frequency of 40 kHz)
•The high-speed external clock divided by 32.
3.16 Communication interfaces
3.16.1 Inter-integrated circuit interface (I2C)
The devices feature an I2C bus interface which can operate in multimaster and slave mode.
It can support standard (up to 100 kHz), fast (up to 400 kHz) and fast mode + (up to 1 MHz)
modes.
It supports 7-bit and 10-bit addressing modes, multiple 7-bit slave addresses (2 addresses,
1 with configurable mask). It also includes programmable analog and digital noise filters.
In addition, it provides hardware support for SMBUS 2.0 and PMBUS 1.1: ARP capability,
Host notify protocol, hardware CRC (PEC) generation/verification, timeouts verifications and
ALERT protocol management. It also has a clock domain independent from the CPU clock,
allowing the I2C1 to wake up the MCU from Stop mode on address match.
The I2C interface can be served by the DMA controller.
The features available in I2C1 are showed below in Table 7.
Table 6. Comparison of I2C analog and digital filters
-Analog filter Digital filter
Pulse width of
suppressed spikes ≥ 50 ns Programmable length from 1 to 15
I2C peripheral clocks
Benefits Available in Stop mode
1. Extra filtering capability vs.
standard requirements.
2. Stable length
Drawbacks Variations depending on
temperature, voltage, process
Wakeup from Stop on address
match is not available when digital
filter is enabled.
Table 7. STM32F303x6/8 I2C implementation
I2C features(1) I2C1
7-bit addressing mode X
10-bit addressing mode X
Standard mode (up to 100 kbit/s) X
Fast mode (up to 400 kbit/s) X
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26/115 DocID025083 Rev 5
3.16.2 Universal synchronous / asynchronous
receivers / transmitters (USARTs)
The STM32F303x6/8 devices have three embedded universal synchronous
receivers/transmitters (USART1, USART2 and USART3).
The USART interfaces are able to communicate at speeds of up to 9 Mbits/s.
USART1 provides hardware management of the CTS and RTS signals. It supports IrDA SIR
ENDEC, the multiprocessor communication mode, the single-wire half-duplex
communication mode and has LIN Master/Slave capability.
All USART interfaces can be served by the DMA controller.
The features available in the USART interfaces are showed below in Table 8.
Fast Mode Plus with 20mA output drive I/Os (up to 1 Mbit/s) X
Independent clock X
SMBus X
Wakeup from STOP X
1. X = supported.
Table 7. STM32F303x6/8 I2C implementation (continued)
I2C features(1) I2C1
Table 8. USART features
USART modes/features(1)
1. X = supported.
USART1 USART2
USART3
Hardware flow control for modem X X
Continuous communication using DMA X X
Multiprocessor communication X X
Synchronous mode X X
Smartcard mode X -
Single-wire half-duplex communication X X
IrDA SIR ENDEC block X -
LIN mode X -
Dual clock domain and wakeup from Stop mode X -
Receiver timeout interrupt X -
Modbus communication X -
Auto baud rate detection X -
Driver Enable X X
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STM32F303x6/x8 Functional overview
43
3.16.3 Serial peripheral interface (SPI)
A SPI interface allows to communicate up to 18 Mbits/s in slave and master modes in full-
duplex and simplex communication modes. The 3-bit prescaler gives 8 master mode
frequencies and the frame size is configurable from 4 bits to 16 bits.
The features available in SPI1 are showed below in Table 9.
3.16.4 Controller area network (CAN)
The CAN is compliant with specifications 2.0A and B (active) with a bit rate up to 1 Mbit/s. It
can receive and transmit standard frames with 11-bit identifiers as well as extended frames
with 29-bit identifiers. It has three transmit mailboxes, two receive FIFOs with 3 stages and
14 scalable filter banks.
3.17 Infrared transmitter
The STM32F303x6/8 devices provide an infrared transmitter solution. The solution is based
on internal connections between TIM16 and TIM17 as shown in the figure below.
TIM17 is used to provide the carrier frequency and TIM16 provides the main signal to be
sent. The infrared output signal is available on PB9 or PA13.
To generate the infrared remote control signals, TIM16 channel 1 and TIM17 channel 1 must
be properly configured to generate correct waveforms. All standard IR pulse modulation
modes is obtained by programming the two timers of the output compare channels (see
Figure 3).
Table 9. STM32F303x6/8 SPI implementation
SPI features(1)
1. X = supported.
SPI1
Hardware CRC calculation X
Rx/Tx FIFO X
NSS pulse mode X
TI mode X
Functional overview STM32F303x6/x8
28/115 DocID025083 Rev 5
Figure 3. Infrared transmitter
3.18 Touch sensing controller (TSC)
The STM32F303x6/8 devices provide a simple solution for adding capacitive sensing
functionality to any application. These devices offer up to 18 capacitive sensing channels
distributed over 6 analog I/Os group.
Capacitive sensing technology is able to detect the presence of a finger near an electrode
which is protected from direct touch by a dielectric (glass, plastic,...). The capacitive
variation introduced by the finger (or any conductive object) is measured using a proven
implementation based on a surface charge transfer acquisition principle. It consists of
charging the electrode capacitance and then transferring a part of the accumulated charges
into a sampling capacitor until the voltage across this capacitor has reached a specific
threshold. To limit the CPU bandwidth usage this acquisition is directly managed by the
hardware touch sensing controller and only requires few external components to operate.
The touch sensing controller is fully supported by the STMTouch touch sensing firmware
library which is free to use and allows touch sensing functionality to be implemented reliably
in the end application.
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Table 10. Capacitive sensing GPIOs available on STM32F303x6/8 devices
Group Capacitive sensing group name Pin name
1
TSC_G1_IO1 PA0
TSC_G1_IO2 PA1
TSC_G1_IO3 PA2
TSC_G1_IO4 PA3
2
TSC_G2_IO1 PA4
TSC_G2_IO2 PA5
TSC_G2_IO3 PA6
TSC_G2_IO4 PA7
DocID025083 Rev 5 29/115
STM32F303x6/x8 Functional overview
43
3
TSC_G3_IO1 PC5
TSC_G3_IO2 PB0
TSC_G3_IO3 PB1
TSC_G3_IO4 PB2
4
TSC_G4_IO1 PA9
TSC_G4_IO2 PA10
TSC_G4_IO3 PA13
TSC_G4_IO4 PA14
5
TSC_G5_IO1 PB3
TSC_G5_IO2 PB4
TSC_G5_IO3 PB6
TSC_G5_IO4 PB7
6
TSC_G6_IO1 PB11
TSC_G6_IO2 PB12
TSC_G6_IO3 PB13
TSC_G6_IO4 PB14
Table 11. Capacitive sensing GPIO available
Group Capacitive sensing group
name Pin name
1
TSC_G1_IO1 PA0
TSC_G1_IO2 PA1
TSC_G1_IO3 PA2
TSC_G1_IO4 PA3
2
TSC_G2_IO1 PA4
TSC_G2_IO2 PA5
TSC_G2_IO3 PA6
TSC_G2_IO4 PA7
3
TSC_G3_IO1 PC5
TSC_G3_IO2 PB0
TSC_G3_IO3 PB1
TSC_G3_IO1 PC5
Table 10. Capacitive sensing GPIOs available on STM32F303x6/8 devices (continued)
Group Capacitive sensing group name Pin name
Functional overview STM32F303x6/x8
30/115 DocID025083 Rev 5
3.19 Development support
3.19.1 Serial wire JTAG debug port (SWJ-DP)
The ARM SWJ-DP Interface is embedded, and is a combined JTAG and serial wire debug
port that enables either a serial wire debug or a JTAG probe to be connected to the target.
The JTAG TMS and TCK pins are shared respectively with SWDIO and SWCLK and a
specific sequence on the TMS pin is used to switch between JTAG-DP and SW-DP.
4
TSC_G4_IO1 PA9
TSC_G4_IO2 PA10
TSC_G4_IO3 PA13
TSC_G4_IO4 PA14
5
TSC_G5_IO1 PB3
TSC_G5_IO2 PB4
TSC_G5_IO3 PB6
TSC_G5_IO4 PB7
6
TSC_G6_IO1 PB11
TSC_G6_IO2 PB12
TSC_G6_IO3 PB13
TSC_G6_IO4 PB14
Table 12. No. of capacitive sensing channels available on STM32F303x6/8 devices
Analog I/O group
Number of capacitive sensing channels
STM32F303xRx STM32F303xCx STM32F303xKx
G1 3 3 3
G2 3 3 3
G3 3 2 2
G4 3 3 3
G5 3 3 3
G6 3 3 0
Number of capacitive
sensing channels 18 17 14
Table 11. Capacitive sensing GPIO available (continued)
Group Capacitive sensing group
name Pin name
DocID025083 Rev 5 31/115
STM32F303x6/x8 Pinout and pin descriptions
43
4 Pinout and pin descriptions
Figure 4. LQFP32 pinout
Figure 5. LQFP48 pinout
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Pinout and pin descriptions STM32F303x6/x8
32/115 DocID025083 Rev 5
Figure 6. LQFP64 pinout
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DocID025083 Rev 5 33/115
STM32F303x6/x8 Pinout and pin descriptions
43
Table 13. Legend/abbreviations used in the pinout table
Name Abbreviation Definition
Pin name Unless otherwise specified in brackets below the pin name, the pin function during and
after reset is the same as the actual pin name
Pin type
S Supply pin
I Input only pin
I/O Input / output pin
I/O structure
FT 5 V tolerant I/O
FTf 5 V tolerant I/O, FM+ capable
TTa 3.3 V tolerant I/O directly connected to ADC
TT 3.3 V tolerant I/O
TC Standard 3.3 V I/O
B Dedicated BOOT0 pin
RST Bi-directional reset pin with embedded weak pull-up resistor
POR External power-on reset pin with embedded weak pull-up resistor,
powered from VDDA.
Notes Unless otherwise specified by a note, all I/Os are set as floating inputs during and after
reset
Pin
functions
Alternate
functions Functions selected through GPIOx_AFR registers
Additional
functions Functions directly selected/enabled through peripheral registers
Table 14. STM32F303x6/8 pin definitions
Pin Number
Pin name (function
after reset)
Pin type
I/O structure
Pin functions
LQFP
32
LQFP
48
LQFP
64
Alternate
functions Additional functions
- 1 1 VBAT S - Backup power supply
-22 PC13
(1) I/O TC TIM1_CH1N RTC_TAMP1/RTC_TS/
RTC_OUT/WKUP2
- 3 3 PC14 / OSC32_IN(1) I/O TC - OSC32_IN
- 4 4 PC15 / OSC32_OUT(1) I/O TC - OSC32_OUT
2 5 5 PF0 / OSC_IN I/O FT TIM1_CH3N OSC_IN
Pinout and pin descriptions STM32F303x6/x8
34/115 DocID025083 Rev 5
3 6 6 PF1 / OSC_OUT I/O FT - OSC_OUT
4 7 7 NRST I/O RST Device reset input / internal reset output
(active low)
- - 8 PC0 I/O TTa EVENTOUT, TIM1_CH1 ADC12_IN6
- - 9 PC1 I/O TTa EVENTOUT, TIM1_CH2 ADC12_IN7
- - 10 PC2 I/O TTa EVENTOUT, TIM1_CH3 ADC12_IN8
- - 11 PC3 I/O TTa EVENTOUT, TIM1_CH4,
TIM1_BKIN2 ADC12_IN9
- 8 12 VSSA/VREF- S - Analog ground/Negative reference voltage
5 9 13 VDDA/VREF+ S - Analog power supply/Positive reference voltage
6 10 14 PA0 I/O TTa
TIM2_CH1/
TIM2_ETR,
TSC_G1_IO1,
USART2_CTS,
EVENTOUT
ADC1_IN1(2),
RTC_TAMP2/WKUP1
7 11 15 PA1 I/O TTa
TIM2_CH2,
TSC_G1_IO2,
USART2_RTS_DE,
TIM15_CH1N,
EVENTOUT
ADC1_IN2(2), RTC_REFIN
8 12 16 PA2 I/O TTa
TIM2_CH3,
TSC_G1_IO3,
USART2_TX,
COMP2_OUT,
TIM15_CH1,
EVENTOUT
ADC1_IN3(2), COMP2_INM
9 13 17 PA3 I/O TTa
TIM2_CH4,
TSC_G1_IO4,
USART2_RX,
TIM15_CH2,
EVENTOUT
ADC1_IN4(2)
--18 VSS S - - -
--19 VDD S - - -
10 14 20 PA4(3) I/O TTa
TIM3_CH2,
TSC_G2_IO1,
SPI1_NSS,
USART2_CK,
EVENTOUT
ADC2_IN1(2), DAC1_OUT1,
COMP2_INM4, COMP4_INM4,
COMP6_INM4
11 15 21 PA5(3) I/O TTa
TIM2_CH1/
TIM2_ETR,
TSC_G2_IO2,
SPI1_SCK, EVENTOUT
ADC2_IN2(2), DAC1_OUT2,
OPAMP2_VINM
Table 14. STM32F303x6/8 pin definitions (continued)
Pin Number
Pin name (function
after reset)
Pin type
I/O structure
Pin functions
LQFP
32
LQFP
48
LQFP
64
Alternate
functions Additional functions
DocID025083 Rev 5 35/115
STM32F303x6/x8 Pinout and pin descriptions
43
12 16 22 PA6(3) I/O TTa
TIM16_CH1, TIM3_CH1,
TSC_G2_IO3,
SPI1_MISO,
TIM1_BKIN, ,
EVENTOUT
ADC2_IN3(2), DAC2_OUT1,
OPAMP2_VOUT
13 17 23 PA7 I/O TTa
TIM17_CH1, TIM3_CH2,
TSC_G2_IO4,
SPI1_MOSI,
TIM1_CH1N,
EVENTOUT
ADC2_IN4(2), COMP2_INP,
OPAMP2_VINP
- - 24 PC4 I/O TTa EVENTOUT, TIM1_ETR,
USART1_TX ADC2_IN5(2)
- - 25 PC5 I/O TTa
EVENTOUT,
TIM15_BKIN,
TSC_G3_IO1,
USART1_RX
ADC2_IN11, OPAMP2_VINM
14 18 26 PB0 I/O TTa
TIM3_CH3,
TSC_G3_IO2,
TIM1_CH2N,
EVENTOUT
ADC1_IN11, COMP4_INP,
OPAMP2_VINP
15 19 27 PB1 I/O TTa
TIM3_CH4,
TSC_G3_IO3,
TIM1_CH3N,
COMP4_OUT,
EVENTOUT
ADC1_IN12
- 20 28 PB2 I/O TTa TSC_G3_IO4,
EVENTOUT ADC2_IN12, COMP4_INM
- 21 29 PB10 I/O TT
TIM2_CH3, TSC_SYNC,
USART3_TX,
EVENTOUT
-
- 22 30 PB11 I/O TTa
TIM2_CH4,
TSC_G6_IO1,
USART3_RX,
EVENTOUT
COMP6_INP
16 23 31 VSS S - Digital ground
17 24 32 VDD S - Digital power supply
- 25 33 PB12 I/O TTa
TSC_G6_IO2,
TIM1_BKIN,
USART3_CK,
EVENTOUT
ADC2_IN13
- 26 34 PB13 I/O TTa
TSC_G6_IO3,
TIM1_CH1N,
USART3_CTS,
EVENTOUT
ADC1_IN13
- 27 35 PB14 I/O TTa
TIM15_CH1,
TSC_G6_IO4,
TIM1_CH2N,
USART3_RTS_DE,
EVENTOUT
ADC2_IN14, OPAMP2_VINP
Table 14. STM32F303x6/8 pin definitions (continued)
Pin Number
Pin name (function
after reset)
Pin type
I/O structure
Pin functions
LQFP
32
LQFP
48
LQFP
64
Alternate
functions Additional functions
Pinout and pin descriptions STM32F303x6/x8
36/115 DocID025083 Rev 5
- 28 36 PB15 I/O TTa
TIM15_CH2,
TIM15_CH1N,
TIM1_CH3N,
EVENTOUT
ADC2_IN15, COMP6_INM,
RTC_REFIN
- - 37 PC6 I/O FT EVENTOUT, TIM3_CH1,
COMP6_OUT -
- - 38 PC7 I/O FT EVENTOUT, TIM3_CH2, -
- - 39 PC8 I/O FT EVENTOUT, TIM3_CH3, -
- - 40 PC9 I/O FT EVENTOUT, TIM3_CH4, -
18 29 41 PA8 I/O FT
MCO, TIM1_CH1,
USART1_CK,
EVENTOUT
-
19 30 42 PA9 I/O FT
TSC_G4_IO1,
TIM1_CH2,
USART1_TX,
TIM15_BKIN,
TIM2_CH3, EVENTOUT
-
20 31 43 PA10 I/O FT
TIM17_BKIN,
TSC_G4_IO2,
TIM1_CH3,
USART1_RX,
COMP6_OUT,
TIM2_CH4, EVENTOUT
-
21 32 44 PA11 I/O FT
TIM1_CH1N,
USART1_CTS,
CAN_RX, TIM1_CH4,
TIM1_BKIN2,
EVENTOUT
-
22 33 45 PA12 I/O FT
TIM16_CH1,
TIM1_CH2N,
USART1_RTS_DE,
COMP2_OUT, CAN_TX,
TIM1_ETR, EVENTOUT
-
23 34 46 PA13 I/O FT
JTMS/SWDAT,
TIM16_CH1N,
TSC_G4_IO3, IR_OUT,
USART3_CTS,
EVENTOUT
-
-3547 VSS S - - -
-3648 VDD S - - -
24 37 49 PA14 I/O FTf
JTCK/SWCLK,
TSC_G4_IO4,
I2C1_SDA, TIM1_BKIN,
USART2_TX,
EVENTOUT
-
Table 14. STM32F303x6/8 pin definitions (continued)
Pin Number
Pin name (function
after reset)
Pin type
I/O structure
Pin functions
LQFP
32
LQFP
48
LQFP
64
Alternate
functions Additional functions
DocID025083 Rev 5 37/115
STM32F303x6/x8 Pinout and pin descriptions
43
25 38 50 PA15 I/O FTf
JTDI,
TIM2_CH1/TIM2_ETR,
TSC_SYNC, I2C1_SCL,
SPI1_NSS,
USART2_RX,
TIM1_BKIN,
EVENTOUT
-
- - 51 PC10 I/O FT EVENTOUT,
USART3_TX -
- - 52 PC11 I/O FT EVENTOUT,
USART3_RX -
- - 53 PC12 I/O FT EVENTOUT,
USART3_CK -
- - 54 PD2 I/O FT EVENTOUT, TIM3_ETR -
26 39 55 PB3 I/O FT
JTDO/TRACE
SWO, TIM2_CH2,
TSC_G5_IO1,
SPI1_SCK,
USART2_TX,
TIM3_ETR, EVENTOUT
-
27 40 56 PB4 I/O FT
NJTRST, TIM16_CH1,
TIM3_CH1,
TSC_G5_IO2,
SPI1_MISO,
USART2_RX,
TIM17_BKIN,
EVENTOUT
-
28 41 57 PB5 I/O FT
TIM16_BKIN,
TIM3_CH2,
I2C1_SMBA,
SPI1_MOSI,
USART2_CK,
TIM17_CH1,
EVENTOUT
-
29 42 58 PB6 I/O FTf
TIM16_CH1N,
TSC_G5_IO3,
I2C1_SCL,
USART1_TX,
EVENTOUT
-
30 43 59 PB7 I/O FTf
TIM17_CH1N,
TSC_G5_IO4,
I2C1_SDA,
USART1_RX,
TIM3_CH4, EVENTOUT
-
31 44 60 BOOT0 I B - -
- 45 61 PB8 I/O FTf
TIM16_CH1,
TSC_SYNC, I2C1_SCL,
USART3_RX, CAN_RX,
TIM1_BKIN,
EVENTOUT
-
Table 14. STM32F303x6/8 pin definitions (continued)
Pin Number
Pin name (function
after reset)
Pin type
I/O structure
Pin functions
LQFP
32
LQFP
48
LQFP
64
Alternate
functions Additional functions
Pinout and pin descriptions STM32F303x6/x8
38/115 DocID025083 Rev 5
- 46 62 PB9 I/O FTf
TIM17_CH1, I2C1_SDA,
IR_OUT, USART3_TX,
COMP2_OUT, CAN_TX,
EVENTOUT
-
32 47 63 VSS S - - -
14864 VDD S - - -
1. PC13, PC14 and PC15 are supplied through the power switch. Since the switch sinks only a limited amount of current (3 mA), the use of
GPIO PC13 to PC15 in output mode is limited:
- The speed should not exceed 2 MHz with a maximum load of 30 pF
- These GPIOs must not be used as current sources (e.g. to drive an LED).
After the first backup domain power-up, PC13, PC14 and PC15 operate as GPIOs. Their function then depends on the content of the Backup
registers which is not reset by the main reset. For details on how to manage these GPIOs, refer to the Battery backup domain and BKP
register description sections in the reference manual.
2. Fast ADC channel.
3. These GPIOs offer a reduced touch sensing sensitivity. It is thus recommended to use them as sampling capacitor I/O.
Table 14. STM32F303x6/8 pin definitions (continued)
Pin Number
Pin name (function
after reset)
Pin type
I/O structure
Pin functions
LQFP
32
LQFP
48
LQFP
64
Alternate
functions Additional functions
DocID025083 Rev 5 41/115
STM32F303x6/x8 Memory mapping
43
5 Memory mapping
Figure 7. STM32F303x6/8 memory map
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Memory mapping STM32F303x6/x8
42/115 DocID025083 Rev 5
- Table 16. STM32F303x6/8 peripheral register boundary addresses
Bus Boundary address Size
(bytes) Peripheral
AHB3 0x5000 0000 - 0x5000 03FF 1 K ADC1 - ADC2
-0x4800 1800 - 0x4FFF FFFF ~132 M Reserved
AHB2 0x4800 1400 - 0x4800 17FF 1 K GPIOF
-0x4800 1000 - 0x4800 13FF 1 K Reserved
AHB2
0x4800 0C00 - 0x4800 0FFF 1 K GPIOD
0x4800 0800 - 0x4800 0BFF 1 K GPIOC
0x4800 0400 - 0x4800 07FF 1 K GPIOB
0x4800 0000 - 0x4800 03FF 1 K GPIOA
-0x4002 4400 - 0x47FF FFFF ~128 M Reserved
AHB1
0x4002 4000 - 0x4002 43FF 1 K TSC
0x4002 3400 - 0x4002 3FFF 3 K Reserved
0x4002 3000 - 0x4002 33FF 1 K CRC
0x4002 2400 - 0x4002 2FFF 3 K Reserved
0x4002 2000 - 0x4002 23FF 1 K Flash interface
0x4002 1400 - 0x4002 1FFF 3 K Reserved
0x4002 1000 - 0x4002 13FF 1 K RCC
0x4002 0400 - 0x4002 0FFF 3 K Reserved
0x4002 0000 - 0x4002 03FF 1 K DMA1
-0x4001 8000 - 0x4001 FFFF 32 K Reserved
APB2
0x4001 4C00 - 0x4001 73FF 12 K Reserved
0x4001 4800 - 0x4001 4BFF 1 K TIM17
0x4001 4400 - 0x4001 47FF 1 K TIM16
0x4001 4000 - 0x4001 43FF 1 K TIM15
0x4001 3C00 - 0x4001 3FFF 1 K Reserved
0x4001 3800 - 0x4001 3BFF 1 K USART1
0x4001 3400 - 0x4001 37FF 1 K Reserved
0x4001 3000 - 0x4001 33FF 1 K SPI1
0x4001 2C00 - 0x4001 2FFF 1 K TIM1
0x4001 0800 - 0x4001 2BFF 9 K Reserved
0x4001 0400 - 0x4001 07FF 1 K EXTI
0x4001 0000 - 0x4001 03FF 1 K SYSCFG + COMP + OPAMP
-0x4000 9C00 - 0x4000 FFFF 25 K Reserved
DocID025083 Rev 5 43/115
STM32F303x6/x8 Memory mapping
43
APB1
0x4000 9800 - 0x4000 9BFF 1 K DAC2
0x4000 7800 - 0x4000 97FF 8 K Reserved
0x4000 7400 - 0x4000 77FF 1 K DAC1
0x4000 7000 - 0x4000 73FF 1 K PWR
0x4000 6800 - 0x4000 6FFF 2 K Reserved
0x4000 6400 - 0x4000 67FF 1 K bxCAN
0x4000 5800 - 0x4000 63FF 3 K Reserved
0x4000 5400 - 0x4000 57FF 1 K I2C1
0x4000 4C00 - 0x4000 53FF 2 K Reserved
0x4000 4800 - 0x4000 4BFF 1 K USART3
0x4000 4400 - 0x4000 47FF 1 K USART2
0x4000 3400 - 0x4000 43FF 2 K Reserved
0x4000 3000 - 0x4000 33FF 1 K IWDG
0x4000 2C00 - 0x4000 2FFF 1 K WWDG
0x4000 2800 - 0x4000 2BFF 1 K RTC
0x4000 1800 - 0x4000 27FF 4 K Reserved
0x4000 1400 - 0x4000 17FF 1 K TIM7
0x4000 1000 - 0x4000 13FF 1 K TIM6
0x4000 0800 - 0x4000 0FFF 2 K Reserved
0x4000 0400 - 0x4000 07FF 1 K TIM3
0x4000 0000 - 0x4000 03FF 1 K TIM2
-0x2000 3000 - 3FFF FFFF ~512 M Reserved
- 0x2000 0000 - 0x2000 2FFF 12 K SRAM
- 0x1FFF F800 - 0x1FFF FFFF 2 K Option bytes
- 0x1FFF D800 - 0x1FFF F7FF 8 K System memory
-0x1000 2000 - 0x1FFF D7FF ~256 M Reserved
- 0x1000 0000 - 0x1000 0FFF 4 K CCM RAM
-0x0804 0000 - 0x0FFF FFFF ~128 M Reserved
- 0x0800 0000 - 0x0800 FFFF 64 K Main Flash memory
-0x0004 0000 - 0x07FF FFFF ~128 M Reserved
- 0x0000 000 - 0x0000 FFFF 64 K
Main Flash memory, system
memory or SRAM depending
on BOOT configuration
Table 16. STM32F303x6/8 peripheral register boundary addresses (continued)
Bus Boundary address Size
(bytes) Peripheral
Electrical characteristics STM32F303x6/x8
44/115 DocID025083 Rev 5
6 Electrical characteristics
6.1 Parameter conditions
Unless otherwise specified, all voltages are referenced to VSS.
6.1.1 Minimum and maximum values
Unless otherwise specified, the minimum and maximum values are guaranteed in the worst
conditions of ambient temperature, supply voltage and frequencies by tests in production on
100% of the devices with an ambient temperature at TA = 25 °C and TA = TAmax (given by
the selected temperature range).
Data based on characterization results, design simulation and/or technology characteristics
are indicated in the table footnotes and are not tested in production. Based on
characterization, the minimum and maximum values refer to sample tests and represent the
mean value plus or minus three times the standard deviation (mean ±3 σ).
6.1.2 Typical values
Unless otherwise specified, typical data are based on TA = 25 °C, VDD = 3.3 V, VDDA =
3.3 V. They are given only as design guidelines and are not tested.
Typical ADC accuracy values are determined by characterization of a batch of samples from
a standard diffusion lot over the full temperature range, where 95% of the devices have an
error less than or equal to the value indicated (mean±2σ).
6.1.3 Typical curves
Unless otherwise specified, all typical curves are given only as design guidelines and are
not tested.
6.1.4 Loading capacitor
The loading conditions used for pin parameter measurement are shown in Figure 8.
6.1.5 Input voltage on a pin
The input voltage measurement on a pin of the device is described in Figure 9.
Figure 8. Pin loading conditions Figure 9. Pin input voltage
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DocID025083 Rev 5 45/115
STM32F303x6/x8 Electrical characteristics
100
6.1.6 Power-supply scheme
Figure 10. Power-supply scheme
Caution: Each power-supply pair (VDD/VSS, VDDA/VSSA etc..) must be decoupled with filtering
ceramic capacitors as shown above. These capacitors must be placed as close as possible
to, or below the appropriate pins on the underside of the PCB to ensure the good
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Electrical characteristics STM32F303x6/x8
46/115 DocID025083 Rev 5
6.1.7 Measurement of the current consumption
Figure 11. Scheme of the current-consumption measurement
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DocID025083 Rev 5 47/115
STM32F303x6/x8 Electrical characteristics
100
6.2 Absolute maximum ratings
Stresses above the absolute maximum ratings listed in Table 17: Voltage characteristics,
Table 18: Current characteristics, and Table 19: Thermal characteristics may cause
permanent damage to the device. These are stress ratings only and functional operation of
the device at these conditions is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
Table 17. Voltage characteristics(1)
Symbol Ratings Min. Max. Unit
VDD–VSS
External main supply voltage (including VDDA, VBAT
and VDD)-0.3
V
VDD–VDDA Allowed voltage difference for VDD > VDDA -0.4
VIN(2)
Input voltage on FT and FTf pins VSS − 0.3 VDD + 4.0
Input voltage on TTa VSS − 0.3 4.0
Input voltage on any other pin VSS − 0.3 4.0
Input voltage on Boot0 pin 0 9
|ΔVDDx| Variations between different VDD power pins - 50
mV
|VSSX − VSS| Variations between all the different ground pins(3) -50
VESD(HBM)
Electrostatic discharge voltage (human body
model)
see Section 6.3.12: Electrical
sensitivity characteristics -
1. All main power (VDD, VDDA) and ground (VSS, VSSA) pins must always be connected to the external power supply, in the
permitted range. The following relationship must be respected between VDDA and VDD:
VDDA must power on before or at the same time as VDD in the power up sequence.
VDDA must be greater than or equal to VDD.
2. VIN maximum must always be respected. Refer to Table 18: Current characteristics for the maximum allowed injected
current values.
3. Include VREF- pin.
Electrical characteristics STM32F303x6/x8
48/115 DocID025083 Rev 5
Table 18. Current characteristics
Symbol Ratings Max. Unit
ΣIVDD Total current into sum of all VDD_x power lines (source)(1) 140
mA
ΣIVSS Total current out of sum of all VSS_x ground lines (sink)(1) -140
IVDD Maximum current into each VDD_x power line (source)(1) 100
IVSS Maximum current out of each VSS _x ground line (sink)(1) 100
IIO(PIN)
Output current sunk by any I/O and control pin 25
Output current source by any I/O and control pin -25
ΣIIO(PIN)
Total output current sunk by sum of all I/Os and control pins(2) 80
Total output current sourced by sum of all I/Os and control pins(2) -80
IINJ(PIN)
Injected current on TT, FT, FTf and B pins(3) -5 /+0
Injected current on TC and RST pin(4) ±5
Injected current on TTa pins(5) ±5
ΣIINJ(PIN) Total injected current (sum of all I/O and control pins)(6) ±25
1. All main power (VDD, VDDA) and ground (VSS and VSSA) pins must always be connected to the external power supply, in the
permitted range.
2. This current consumption must be correctly distributed over all I/Os and control pins.The total output current must not be
sunk/sourced between two consecutive power supply pins referring to high pin count LQFP packages.
3. Positive injection is not possible on these I/Os and does not occur for input voltages lower than the specified maximum
value.
4. A positive injection is induced by VIN > VDD while a negative injection is induced by VIN< VSS. IINJ(PIN) must never be
exceeded. Refer to Table 17: Voltage characteristics for the maximum allowed input voltage values.
5. A positive injection is induced by VIN > VDDA while a negative injection is induced by VIN< VSS. IINJ(PIN) must never be
exceeded. Refer also to Table 17: Voltage characteristics for the maximum allowed input voltage values. Negative injection
disturbs the analog performance of the device. See note 2. below Table 61.
6. When several inputs are submitted to a current injection, the maximum ΣIINJ(PIN) is the absolute sum of the positive and
negative injected currents (instantaneous values).
Table 19. Thermal characteristics
Symbol Ratings Value Unit
TSTG Storage temperature range –65 to +150 °C
TJMaximum junction temperature 150 °C
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STM32F303x6/x8 Electrical characteristics
100
6.3 Operating conditions
6.3.1 General operating conditions
Table 20. General operating conditions
Symbol Parameter Conditions Min. Max. Unit
fHCLK Internal AHB clock frequency - 0 72
MHzfPCLK1 Internal APB1 clock frequency - 0 36
fPCLK2 Internal APB2 clock frequency - 0 72
VDD Standard operating voltage - 2 3.6
V
VDDA
Analog operating voltage
(OPAMP and DAC not used) Must have a potential equal to
or higher than VDD
23.6
Analog operating voltage
(OPAMP and DAC used) 2.4 3.6
VBAT Backup operating voltage - 1.65 3.6 V
VIN I/O input voltage
TC I/O –0.3 VDD+0.3
V
TT I/O -0.3 3.6
TTa I/O –0.3 VDDA+0.3
FT and FTf I/O(1) –0.3 5.5
BOOT0 0 5.5
PD
Power dissipation at TA = 85 °C for
suffix 6 or TA = 105 °C for suffix
7(2)
LQFP64 - 444 mW
PD
Power dissipation at TA = 85 °C for
suffix 6 or TA = 105 °C for suffix
7(3) LQFP48 - 364 mW
TA
Ambient temperature for 6 suffix
version
Maximum power dissipation –40 85
°C
Low power dissipation(4) –40 105
Ambient temperature for 7 suffix
version
Maximum power dissipation –40 105
°C
Low power dissipation(4) –40 125
TJ Junction temperature range
6 suffix version –40 105
°C
7 suffix version –40 125
1. To sustain a voltage higher than VDD+0.3 V, the internal pull-up/pull-down resistors must be disabled.
2. If TA is lower, higher PD values are allowed as long as TJ does not exceed TJmax (see Section 7.5: Thermal characteristics).
3. If TA is lower, higher PD values are allowed as long as TJ does not exceed TJmax (see Section 7.5: Thermal characteristics).
4. In low power dissipation state, TA can be extended to this range as long as TJ does not exceed TJmax (see Section 7.5:
Thermal characteristics).
Electrical characteristics STM32F303x6/x8
50/115 DocID025083 Rev 5
6.3.2 Operating conditions at power-up / power-down
The parameters given in Table 21 are derived from tests performed under the ambient
temperature condition summarized in Table 20.
6.3.3 Characteristics of the embedded reset and power-control block
The parameters given in Table 22 are derived from tests performed under ambient
temperature and VDD supply voltage conditions summarized in Table 20.
Table 21. Operating conditions at power-up / power-down
Symbol Parameter Conditions Min. Max. Unit
tVDD
VDD rise time rate
-
0∞
µs/V
VDD fall time rate 20 ∞
tVDDA
VDDA rise time rate
-
0∞
VDDA fall time rate 20 ∞
Table 22. Embedded reset and power control block characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
VPOR/PDR(1)
1. The PDR detector monitors VDD and also VDDA (if kept enabled in the option bytes). The POR detector
monitors only VDD.
Power on/power down
reset threshold
Falling edge 1.8(2)
2. The product behavior is guaranteed by design down to the minimum VPOR/PDR value.
1.88 1.96 V
Rising edge 1.84 1.92 2.0 V
VPDRhyst(1) PDR hysteresis - - 40 - mV
tRSTTEMPO(3)
3. Guaranteed by design, not tested in production.
POR reset
temporization - 1.5 2.5 4.5 ms
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STM32F303x6/x8 Electrical characteristics
100
6.3.4 Embedded reference voltage
The parameters given in Table 24 are derived from tests performed under ambient
temperature and VDD supply voltage conditions summarized in Table 20.
Table 23. Programmable voltage detector characteristics
Symbol Parameter Conditions Min.(1)
1. Data based on characterization results only, not tested in production.
Typ. Max.(1) Unit
VPVD0 PVD threshold 0
Rising edge 2.1 2.18 2.26
V
Falling edge 2 2.08 2.16
VPVD1 PVD threshold 1
Rising edge 2.19 2.28 2.37
Falling edge 2.09 2.18 2.27
VPVD2 PVD threshold 2
Rising edge 2.28 2.38 2.48
Falling edge 2.18 2.28 2.38
VPVD3 PVD threshold 3
Rising edge 2.38 2.48 2.58
Falling edge 2.28 2.38 2.48
VPVD4 PVD threshold 4
Rising edge 2.47 2.58 2.69
Falling edge 2.37 2.48 2.59
VPVD5 PVD threshold 5
Rising edge 2.57 2.68 2.79
Falling edge 2.47 2.58 2.69
VPVD6 PVD threshold 6
Rising edge 2.66 2.78 2.9
Falling edge 2.56 2.68 2.8
VPVD7 PVD threshold 7
Rising edge 2.76 2.88 3
Falling edge 2.66 2.78 2.9
VPVDhyst(2)
2. Guaranteed by design, not tested in production.
PVD hysteresis - - 100 - mV
IDD(PVD) PVD current
consumption - - 0.15 0.26 µA
Table 24. Embedded internal reference voltage
Symbol Parameter Conditions Min. Typ. Max. Unit
VREFINT Internal reference voltage –40 °C < TA < +105 °C 1.20 1.23 1.25 V
TS_vrefint
ADC sampling time when
reading the internal
reference voltage
-2.2--µs
VRERINT
Internal reference voltage
spread over the
temperature range
VDD = 31.8 V ±10 mV - - 10(1)
1. Guaranteed by design, not tested in production.
mV
TCoeff Temperature coefficient - - - 100(1) ppm/°C
Electrical characteristics STM32F303x6/x8
52/115 DocID025083 Rev 5
6.3.5 Supply current characteristics
The current consumption is a function of several parameters and factors such as the
operating voltage, ambient temperature, I/O pin loading, device software configuration,
operating frequencies, I/O pin switching rate, program location in memory and executed
binary code.
The current consumption is measured as described in Figure 11: Scheme of the current-
consumption measurement.
All Run-mode current consumption measurements given in this section are performed with a
reduced code that gives a consumption equivalent to CoreMark code.
Note: The total current consumption is the sum of IDD and IDDA.
Typical and maximum current consumption
The MCU is placed under the following conditions:
•All I/O pins are in input mode with a static value at VDD or VSS (no load)
•All peripherals are disabled except when explicitly mentioned
•The Flash memory access time is adjusted to the fHCLK frequency (0 wait state from 0
to 24 MHz,1 wait state from 24 to 48 MHz and 2 wait states from 48 to 72 MHz)
•Prefetch in ON (reminder: this bit must be set before clock setting and bus prescaling)
•When the peripherals are enabled fPCLK2 = fHCLK and fPCLK1 = fHCLK/2
•When fHCLK > 8 MHz, the PLL is ON and the PLL input is equal to HSI/2 (4 MHz) or
HSE (8 MHz) in bypass mode.
The parameters given in Table 26 to Table 30 are derived from tests performed under
ambient temperature and supply voltage conditions summarized in Table 20.
Table 25. Internal reference voltage calibration values
Calibration value name Description Memory address
VREFINT_CAL
Raw data acquired at
temperature of 30 °C
VDDA= 3.3 V
0x1FFF F7BA - 0x1FFF F7BB
DocID025083 Rev 5 53/115
STM32F303x6/x8 Electrical characteristics
100
Table 26. Typical and maximum current consumption from VDD supply at VDD = 3.6V
Symbol Parameter Conditions fHCLK
All peripherals enabled All peripherals disabled
Unit
Typ.
Max. @ TA(1)
Typ.
Max. @ TA(1)
25 °C 85 °C 105 °C 25 °C 85 °C 105 °C
IDD
Supply
current in
Run mode,
executing
from Flash
External
clock (HSE
bypass)
72 MHz 71.4 77.9 79.1 80.0 27.1 32.2 32.4 32.4
mA
64 MHz 63.9 70.6 71.3 71.5 24.2 27.0 27.5 27.7
48 MHz 49.5 56.6 57.1 57.7 18.7 21.4 21.6 21.9
32 MHz 34.0 38.6 38.9 39.2 12.9 14.6 14.9 15.9
24 MHz 25.9 30.2 30.4 30.6 10.0 11.1 11.2 12.3
8 MHz 9.3 14.1 14.3 14.4 3.3 4.0 4.4 5.1
1 MHz 3.5 8.9 9.1 9.5 0.7 0.9 1.0 1.2
Internal
clock (HSI)
64 MHz 61.6 68.1 68.8 70.1 24.1 27.0 27.1 27.2
48 MHz 48.1 54.6 54.8 55.1 18.6 21.6 21.7 21.9
32 MHz 33.3 37.8 37.9 38.0 12.7 14.4 14.9 16.0
24 MHz 25.7 29.8 29.8 30.0 10.0 11.1 11.2 12.3
8 MHz 9.7 12.2 12.3 12.8 3.4 3.8 4.2 5.0
Supply
current in
Run mode,
executing
from RAM
External
clock (HSE
bypass)
72 MHz 71.3 77.8(2) 78.7 78.9(2) 27.6 32.1(2) 32.2 32.3(2)
64 MHz 63.8 70.5 70.7 70.9 24.5 27.2 27.6 27.7
48 MHz 49.3 56.5 56.9 57.4 18.1 21.6 21.8 21.8
32 MHz 33.9 37.7 37.9 38.0 12.9 14.9 14.9 15.9
24 MHz 25.8 28.8 29.0 29.2 9.8 11.1 11.3 11.5
8 MHz 9.0 13.2 13.3 13.8 3.2 3.6 4.0 4.6
1 MHz 3.2 7.6 7.8 8.0 0.3 0.4 0.8 1.2
Internal
clock (HSI)
64 MHz 61.3 66.9 67.3 67.8 24.1 26.9 27.0 27.1
48 MHz 48.0 52.4 52.6 53.1 19.1 21.6 21.6 22.1
32 MHz 33.1 35.6 35.8 36.6 12.6 14.8 14.9 15.9
24 MHz 25.6 28.5 28.7 28.8 9.8 11.1 11.3 11.5
8 MHz 9.7 11.6 11.6 11.7 3.0 3.1 4.1 4.7
IDD
Supply
current in
Sleep
mode,
executing
from Flash
or RAM
External
clock (HSE
bypass)
72 MHz 55.5 58.7(2) 61.1 61.9(2) 7.0 7.3(2) 8.4 8.5(2)
mA
64 MHz 49.8 52.7 54.5 54.8 6.3 6.7 7.0 7.8
48 MHz 38.5 40.6 41.7 41.8 4.6 5.1 5.6 5.9
32 MHz 26.9 28.8 29.2 29.5 3.0 3.3 4.0 4.5
24 MHz 19.1 23.2 23.7 23.9 2.4 2.5 3.2 3.8
8 MHz 7.1 11.5 11.7 11.9 0.6 0.9 1.2 2.1
1 MHz 3.0 7.4 7.7 7.9 0.3 0.3 0.4 1.2
Internal
clock (HSI)
64 MHz 47.7 52.4 52.6 52.8 5.4 6.5 6.8 7.5
48 MHz 35.0 40.4 40.6 40.8 4.3 4.7 5.2 5.7
32 MHz 23.7 27.7 28.3 28.8 2.9 3.1 3.2 4.4
24 MHz 18.5 23.8 24.0 24.2 1.3 1.7 2.2 2.7
8 MHz 7.5 9.6 9.7 9.7 0.5 0.7 1.1 2.0
1. Data based on characterization results, not tested in production unless otherwise specified.
2. Data based on characterization results and tested in production with code executing from RAM.
Electrical characteristics STM32F303x6/x8
54/115 DocID025083 Rev 5
Table 27. Typical and maximum current consumption from the VDDA supply
Symbol Parameter Conditions
(1) fHCLK
VDDA = 2.4 V VDDA = 3.6 V
Unit
Typ.
Max. @ TA(2)
Typ.
Max. @ TA(2)
25 °C 85 °C 105 °C 25 °C 85 °C 105 °C
IDDA
Supply
current in
Run/Sleep
mode,
code
executing
from Flash
or RAM
HSE
bypass
72 MHz 224 252(3) 265 269(3) 245 272(3) 288 295(3)
µA
64 MHz 196 225 237 241 214 243 257 263
48 MHz 147 174 183 186 159 186 196 201
32 MHz 100 126 133 135 109 133 142 145
24 MHz 79 102 107 108 85 108 113 116
8 MHz 3 5 5 6 4 6 6 7
1 MHz 3 5 5 6 3 5 6 6
HSI clock
64 MHz 259 288 304 309 285 315 332 338
48 MHz 208 239 251 254 230 258 271 277
32 MHz 162 190 198 202 179 206 216 219
24 MHz 140 168 175 178 155 181 188 191
8 MHz 62 85 88 89 71 94 96 98
1. Current consumption from the VDDA supply is independent of whether the peripherals are on or off. Furthermore when the
PLL is off, IDDA is independent from the frequency.
2. Data based on characterization results, not tested in production.
3. Data based characterization results and tested in production with code executing from RAM.
Table 28. Typical and maximum VDD consumption in Stop and Standby modes
Symbol Parameter Conditions
Typ. @VDD (VDD=VDDA)Max.
(1)
Unit
2.0
V
2.4
V
2.7
V
3.0
V
3.3
V
3.6
V
TA =
25 °C
TA =
85 °C
TA =
105 °
C
IDD
Supply
current in
Stop mode
Regulator in run mode,
all oscillators OFF
17.5
1
17.6
8
17.8
4
18.1
7
18.5
7
19.3
930.6 232.5 612.2
µA
Regulator in low-power
mode, all oscillators
OFF
6.44 6.51 6.60 6.73 6.96 7.20 20.0 246.4 585.0
Supply
current in
Standby
mode
LSI ON and IWDG ON 0.73 0.89 1.02 1.14 1.28 1.44 - - -
LSI OFF and IWDG
OFF 0.55 0.66 0.75 0.85 0.93 1.01 4.9 7.0 7.9
1. Data based on characterization results, not tested in production unless otherwise specified.
DocID025083 Rev 5 55/115
STM32F303x6/x8 Electrical characteristics
100
Table 29. Typical and maximum VDDA consumption in Stop and Standby modes
Symbol Parameter Conditions
Typ. @VDD (VDD = VDDA)Max.
(1)
Unit
2.0
V
2.4
V
2.7
V
3.0
V
3.3
V
3.6
V
TA =
25 °C
TA =
85 °C
TA =
105 °
C
IDDA
Supply
current in
Stop mode
VDDA supervisor ON
Regulator in run/low-
power mode, all
oscillators OFF
1.67 1.79 1.91 2.04 2.19 2.35 2.5 5.9 6.2
µA
Supply
current in
Standby
mode
LSI ON and IWDG ON 2.06 2.24 2.41 2.60 2.80 3.04 - - -
LSI OFF and IWDG
OFF 1.54 1.68 1.78 1.92 2.06 2.22 2.6 3.0 3.8
Supply
current in
Stop mode
VDDA supervisor OFF
Regulator in run/low-
power mode, all
oscillators OFF
0.97 0.99 1.03 1.07 1.14 1.22 - - -
Supply
current in
Standby
mode
LSI ON and IWDG ON 1.36 1.44 1.52 1.62 1.76 1.91 - - -
LSI OFF and IWDG
OFF 0.86 0.88 0.91 0.95 1.03 1.09 - - -
1. Data based on characterization results, not tested in production.
Table 30. Typical and maximum current consumption from VBAT supply
Symbol Para
meter Conditions(1)
Typ.@VBAT
Max.
@VBAT= 3.6V(2)
Unit
1.65
V
1.8V 2V 2.4V 2.7V 3V 3.3V 3.6V TA=
25°C
TA=
85°
C
TA=
105°C
IDD_VBAT
Backup
domain
supply
current
LSE & RTC
ON; “Xtal
mode” lower
driving
capability;
LSEDRV[1:0]
= '00'
0.42 0.44 0.47 0.54 0.60 0.66 0.74 0.82 - - -
µA
LSE & RTC
ON; “Xtal
mode” higher
driving
capability;
LSEDRV[1:0]
= '11'
0.71 0.74 0.77 0.85 0.91 0.98 1.06 1.16 - - -
1. Crystal used: Abracon ABS07-120-32.768 kHz-T with a CL of 6 pF for typical values.
2. Data based on characterization results, not tested in production.
Electrical characteristics STM32F303x6/x8
56/115 DocID025083 Rev 5
Figure 12. Typical VBAT current consumption (LSE and RTC ON/LSEDRV[1:0] = ’00’)
Typical current consumption
The MCU is placed under the following conditions:
•VDD = VDDA = 3.3 V
•All I/O pins available on each package are in analog input configuration
•The Flash access time is adjusted to fHCLK frequency (0 wait states from 0 to 24 MHz,
1 wait state from 24 to 48 MHz and 2 wait states from 48 MHz to 72 MHz), and Flash
prefetch is ON
•When the peripherals are enabled, fAPB1 = fAHB/2, fAPB2 = fAHB
•PLL is used for frequencies greater than 8 MHz
•AHB prescaler of 2, 4, 8,16 and 64 is used for the frequencies 4 MHz, 2 MHz, 1 MHz,
500 kHz and 125 kHz respectively.
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DocID025083 Rev 5 57/115
STM32F303x6/x8 Electrical characteristics
100
Table 31. Typical current consumption in Run mode, code with data processing
running from Flash
Symbol Parameter Conditions fHCLK
Typ.
Unit
Peripherals
enabled
Peripherals
disabled
IDD
Supply current in
Run mode from
VDD supply
Running from HSE
crystal clock 8 MHz,
code executing from
Flash
72 MHz 47.2 25.2
mA
64 MHz 39.5 22.6
48 MHz 30.4 17.3
32 MHz 20.9 12.0
24 MHz 17.3 9.3
16 MHz 11.0 6.5
8 MHz 5.8 3.55
4 MHz 3.45 2.21
2 MHz 2.16 1.52
1 MHz 1.50 1.17
500 kHz 1.18 0.94
125 kHz 0.88 0.82
IDDA(1) (2)
Supply current in
Run mode from
VDDA supply
72 MHz 240.0 234.0
µA
64 MHz 209.9 208.6
48 MHz 154.5 153.5
32 MHz 104.1 103.6
24 MHz 80.2 80.0
16 MHz 56.8 56.6
8 MHz 1.14 1.14
4 MHz 1.14 1.14
2 MHz 1.14 1.14
1 MHz 1.14 1.14
500 kHz 1.14 1.14
125 kHz 1.14 1.14
1. VDDA supervisor is OFF.
2. When peripherals are enabled, the power consumption of the analog part of peripherals such as ADC, DAC, Comparators,
OpAmp etc. is not included. Refer to the tables of characteristics in the subsequent sections.
Electrical characteristics STM32F303x6/x8
58/115 DocID025083 Rev 5
Table 32. Typical current consumption in Run mode, code with data processing
running from Flash memory
Symbol Parameter Conditions fHCLK
Typ.
Unit
Peripherals
enabled
Peripherals
disabled
IDD
Supply current in
Run mode from
VDD supply
Running from HSE
crystal clock 8 MHz,
code executing from
Flash
72 MHz 70.6 25.2
mA
64 MHz 60.3 22.6
48 MHz 46.0 17.3
32 MHz 31.3 12.0
24 MHz 25.0 9.3
16 MHz 16.2 6.5
8 MHz 8.4 3.55
4 MHz 4.75 2.21
2 MHz 2.81 1.52
1 MHz 1.82 1.17
500 kHz 1.34 0.94
125 kHz 0.93 0.82
IDDA(1) (2)
Supply current in
Run mode from
VDDA supply
72 MHz 240.0 234.0
µA
64 MHz 209.9 208.6
48 MHz 154.5 153.5
32 MHz 104.1 103.6
24 MHz 80.2 80.0
16 MHz 56.8 56.6
8 MHz 1.14 1.14
4 MHz 1.14 1.14
2 MHz 1.14 1.14
1 MHz 1.14 1.14
500 kHz 1.14 1.14
125 kHz 1.14 1.14
1. VDDA supervisor is OFF.
2. When peripherals are enabled, the power consumption of the analog part of peripherals such as ADC, DAC, Comparators,
OpAmp etc. is not included. Refer to the tables of characteristics in the subsequent sections.
DocID025083 Rev 5 59/115
STM32F303x6/x8 Electrical characteristics
100
I/O system current consumption
The current consumption of the I/O system has two components: static and dynamic.
I/O static current consumption
All the I/Os used as inputs with pull-up generate current consumption when the pin is
externally held low. The value of this current consumption can be simply computed by using
the pull-up/pull-down resistors values given in Table 52: I/O static characteristics.
Table 33. Typical current consumption in Sleep mode, code running from Flash or RAM
Symbol Parameter Conditions fHCLK
Typ.
Unit
Peripherals
enabled
Peripherals
disabled
IDD
Supply current in
Sleep mode from
VDD supply
Running from HSE
crystal clock 8 MHz,
code executing from
Flash or RAM
72 MHz 28.5 6.3
mA
64 MHz 25.6 5.7
48 MHz 19.5 4.40
32 MHz 13.3 3.13
24 MHz 10.2 2.49
16 MHz 7.1 1.85
8 MHz 3.63 0.99
4 MHz 2.38 0.88
2 MHz 1.61 0.80
1 MHz 1.23 0.76
500 kHz 1.04 0.74
125 kHz 0.85 0.72
IDDA(1) (2)
Supply current in
Sleep mode from
VDDA supply
72 MHz 239.0 236.7
µA
64 MHz 209.4 207.8
48 MHz 154.0 152.9
32 MHz 103.7 103.2
24 MHz 80.1 79.8
16 MHz 56.7 56.6
8 MHz 1.14 1.14
4 MHz 1.14 1.14
2 MHz 1.14 1.14
1 MHz 1.14 1.14
500 kHz 1.14 1.14
125 kHz 1.14 1.14
1. VDDA supervisor is OFF.
2. When peripherals are enabled, the power consumption of the analog part of peripherals such as ADC, DAC, Comparators,
OpAmp etc. is not included. Refer to the tables of characteristics in the subsequent sections.
Electrical characteristics STM32F303x6/x8
60/115 DocID025083 Rev 5
For the output pins, any external pull-down or external load must also be considered to
estimate the current consumption.
Additional I/O current consumption is due to I/Os configured as inputs if an intermediate
voltage level is externally applied. This current consumption is caused by the input Schmitt
trigger circuits used to discriminate the input value. Unless this specific configuration is
required by the application, this supply current consumption can be avoided by configuring
these I/Os in analog mode. This is notably the case of ADC input pins which should be
configured as analog inputs.
Caution: Any floating input pin can also settle to an intermediate voltage level or switch inadvertently,
as a result of external electromagnetic noise. To avoid current consumption related to
floating pins, they must either be configured in analog mode, or forced internally to a definite
digital value. This can be done either by using pull-up/down resistors or by configuring the
pins in output mode.
I/O dynamic current consumption
In addition to the internal peripheral current consumption (see Table 35: Peripheral current
consumption), the I/Os used by an application also contribute to the current consumption.
When an I/O pin switches, it uses the current from the MCU supply voltage to supply the I/O
pin circuitry and to charge/discharge the capacitive load (internal or external) connected to
the pin:
where:
ISW is the current sunk by a switching I/O to charge/discharge the capacitive load
VDD is the MCU supply voltage
fSW is the I/O switching frequency
C is the total capacitance seen by the I/O pin: C = CINT+ CEXT+CS
ISW VDD fSW C××=
DocID025083 Rev 5 61/115
STM32F303x6/x8 Electrical characteristics
100
The test pin is configured in push-pull output mode and is toggled by software at a fixed
frequency.
Table 34. Switching output I/O current consumption
Symbol Parameter Conditions(1)
1. CS = 5 pF (estimated value).
I/O toggling
frequency (fSW)Typ. Unit
ISW
I/O current
consumption
VDD =3.3 V
Cext = 0 pF
C = CINT + CEXT+ CS
2 MHz 0.90
mA
4 MHz 0.93
8 MHz 1.16
18 MHz 1.60
36 MHz 2.51
VDD = 3.3 V
Cext = 10 pF
C = CINT + CEXT +CS
2 MHz 0.93
4 MHz 1.06
8 MHz 1.47
18 MHz 2.26
36 MHz 3.39
VDD = 3.3 V
Cext = 22 pF
C = CINT + CEXT +CS
2 MHz 1.03
4 MHz 1.30
8 MHz 1.79
18 MHz 3.01
36 MHz 5.99
VDD = 3.3 V
Cext = 33 pF
C = CINT + CEXT+ CS
2 MHz 1.10
4 MHz 1.31
8 MHz 2.06
18 MHz 3.47
36 MHz 8.35
VDD = 3.3 V
Cext = 47 pF
C = CINT + CEXT+ CS
2 MHz 1.20
4 MHz 1.54
8 MHz 2.46
18 MHz 4.51
36 MHz 9.98
Electrical characteristics STM32F303x6/x8
62/115 DocID025083 Rev 5
On-chip peripheral current consumption
The MCU is placed under the following conditions:
•All I/O pins are in analog input configuration
•All peripherals are disabled unless otherwise mentioned
•The given value is calculated by measuring the current consumption:
– With all peripherals clocked off
– With only one peripheral clocked on
•Ambient operating temperature at 25°C and VDD = VDDA = 3.3 V
Table 35. Peripheral current consumption
Peripheral
Typical consumption(1)
Unit
IDD
BusMatrix (2) 11.1 µA/MHz
DMA1 8.0 -
CRC 2.1 -
GPIOA 8.7 -
GPIOB 8.4 -
GPIOC 8.4 -
GPIOD 2.6 -
GPIOF 1.7 -
TSC 4.7 -
ADC1&2 17.4 -
APB2-Bridge (3) 3.3 -
SYSCFG 4.2 -
TIM1 32.3 -
USART1 20.3 -
TIM15 13.8 -
TIM16 9.7 -
TIM17 10.3 -
APB1-Bridge (3) 5.3 -
TIM2 43.4 -
TIM3 34.0 -
TIM6 9.7 -
TIM7 10.3 -
WWDG 6.9 -
USART2 18.8 -
USART3 19.1 -
I2C1 13.3 -
DocID025083 Rev 5 63/115
STM32F303x6/x8 Electrical characteristics
100
CAN 31.3 -
PWR 4.7 -
DAC 15.4 -
DAC2 8.6 -
SPI1 8.2 -
1. The power consumption of the analog part (IDDA) of peripherals such as ADC, DAC, Comparators, OpAmp
etc. is not included. Refer to the tables of characteristics in the subsequent sections.
2. BusMatrix is automatically active when at least one master is ON (CPU or DMA1).
3. The APBx bridge is automatically active when at least one peripheral is ON on the same bus.
Table 35. Peripheral current consumption (continued)
Peripheral
Typical consumption(1)
Unit
IDD
Electrical characteristics STM32F303x6/x8
64/115 DocID025083 Rev 5
6.3.6 Wakeup time from low-power mode
The wakeup times given in Table 36 are measured starting from the wakeup event trigger up
to the first instruction executed by the CPU:
•For Stop or Sleep mode: the wakeup event is WFE.
•WKUP1 (PA0) pin is used to wakeup from Standby, Stop and Sleep modes.
All timings are derived from tests performed under ambient temperature and VDD supply
voltage conditions summarized in Table 20.
6.3.7 External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO. The
external clock signal has to respect the I/O characteristics in Section 6.3.14. However, the
recommended clock input waveform is shown in Figure 13.
Table 36. Low-power mode wakeup timings
Symbol Parameter Conditions
Typ. @VDD, VDD = VDDA
Max. Unit
2.0 V 2.4 V 2.7 V 3 V 3.3 V 3.6 V
tWUSTOP
Wakeup from
Stop mode
Regulator in
run mode 4.3 4.1 4.0 3.9 3.8 3.7 4.5
µs
Regulator in
low-power
mode
7.8 6.7 6.1 5.9 5.5 5.3 9
tWUSTANDBY(1) Wakeup from
Standby mode
LSI and
IWDG OFF 74.4 64.3 60.0 56.9 54.3 51.1 103
tWUSLEEP
Wakeup from
Sleep mode -6-
CPU
clock
cycles
1. Data based on characterization results, not tested in production.
Table 37. Wakeup time using USART
Symbol Parameter Conditions Typ Max Unit
tWUUSART
Wakeup time needed to
calculate the maximum
USART baudrate allowing
to wakeup up from stop
mode when USART clock
source is HSI
Stop mode with
main regulator in
low power mode
-13.125
µs
Stop mode with
main regulator in
run mode
- 3.125
DocID025083 Rev 5 65/115
STM32F303x6/x8 Electrical characteristics
100
Figure 13. High-speed external clock source AC timing diagram
Low-speed external user clock generated from an external source
In bypass mode the LSE oscillator is switched off and the input pin is a standard GPIO. The
external clock signal has to respect the I/O characteristics in Section 6.3.14. However, the
recommended clock input waveform is shown in Figure 14
Table 38. High-speed external user clock characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
fHSE_ext
User external clock source
frequency(1)
1. Guaranteed by design, not tested in production.
-
1832MHz
VHSEH OSC_IN input pin high-level voltage 0.7VDD -V
DD V
VHSEL OSC_IN input pin low-level voltage VSS -0.3V
DD
tw(HSEH)
tw(HSEL)
OSC_IN high or low time(1) 15 - -
ns
tr(HSE)
tf(HSE)
OSC_IN rise or fall time(1) --20
Table 39. Low-speed external user clock characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
fLSE_ext
User External clock source
frequency(1)
1. Guaranteed by design, not tested in production.
-
- 32.768 1000 kHz
VLSEH
OSC32_IN input pin high-level
voltage 0.7VDD -V
DD
V
VLSEL
OSC32_IN input pin low-level
voltage VSS -0.3V
DD
tw(LSEH)
tw(LSEL)
OSC32_IN high or low time(1) 450 - -
ns
tr(LSE)
tf(LSE)
OSC32_IN rise or fall time(1) --50
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66/115 DocID025083 Rev 5
Figure 14. Low-speed external clock source AC timing diagram
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 4 to 32 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on design
simulation results obtained with typical external components specified in Table 40. In the
application, the resonator and the load capacitors have to be placed as close as possible to
the oscillator pins to minimize output distortion and startup stabilization time. Refer to the
crystal resonator manufacturer for more details on the resonator characteristics (frequency,
package, accuracy).
Table 40. HSE oscillator characteristics
Symbol Parameter Conditions(1)
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.
Min.(2)
2. Guaranteed by design, not tested in production.
Typ. Max.(2) Unit
fOSC_IN Oscillator frequency - 4 8 32 MHz
RFFeedback resistor - - 200 - kΩ
IDD HSE current consumption
During startup(3)
3. This consumption level occurs during the first 2/3 of the tSU(HSE) startup time.
--8.5
mA
VDD= 3.3 V, Rm= 30Ω,
CL=10 pF@8 MHz -0.4-
VDD= 3.3 V, Rm= 45Ω,
CL=10 pF@8 MHz -0.5-
VDD= 3.3 V, Rm= 30Ω,
CL=5 pF@32 MHz -0.8-
VDD= 3.3 V, Rm= 30Ω,
CL=10 pF@32 MHz -1-
VDD= 3.3 V, Rm= 30Ω,
CL=20 pF@32 MHz -1.5-
gmOscillator transconductance Startup 10 - - mA/V
tSU(HSE)(4)
4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz
oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly
with the crystal manufacturer.
Startup time VDD is stabilized - 2 - ms
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DocID025083 Rev 5 67/115
STM32F303x6/x8 Electrical characteristics
100
For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the
5 pF to 25 pF range (typ.), designed for high-frequency applications, and selected to match
the requirements of the crystal or resonator (see Figure 15). CL1 and CL2 are usually the
same size. The crystal manufacturer typically specifies a load capacitance which is the
series combination of CL1 and CL2. PCB and MCU pin capacitance must be included (10 pF
can be used as a rough estimate of the combined pin and board capacitance) when sizing
CL1 and CL2.
Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 15. Typical application with an 8 MHz crystal
1. REXT value depends on the crystal characteristics.
Low-speed external clock generated from a crystal/ceramic resonator
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on design
simulation results obtained with typical external components specified in Table 41. In the
application, the resonator and the load capacitors have to be placed as close as possible to
the oscillator pins to minimize output distortion and startup stabilization time. Refer to the
crystal resonator manufacturer for more details on the resonator characteristics (frequency,
package, accuracy).
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Electrical characteristics STM32F303x6/x8
68/115 DocID025083 Rev 5
Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Table 41. LSE oscillator characteristics (fLSE = 32.768 kHz)
Symbol Parameter Conditions(1)
1. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator
design guide for ST microcontrollers”.
Min.
(2)
2. Guaranteed by design, not tested in production.
Typ. Max.(
2) Unit
IDD LSE current consumption
LSEDRV[1:0]=00
lower driving capability -0.50.9
µA
LSEDRV[1:0]=10
medium low driving
capability
--1
LSEDRV[1:0]=01
medium high-driving
capability
--1.3
LSEDRV[1:0]=11
higher-driving capability --1.6
gm
Oscillator
transconductance
LSEDRV[1:0]=00
lower-driving capability 5- -
µA/V
LSEDRV[1:0]=10
medium low-driving
capability
8- -
LSEDRV[1:0]=01
medium high-driving
capability
15 - -
LSEDRV[1:0]=11
higher-driving capability 25 - -
tSU(LSE)(3)
3. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized
32.768 kHz oscillation is reached. This value is measured for a standard crystal and it can vary significantly
with the crystal manufacturer.
Startup time VDD is stabilized - 2 - s
DocID025083 Rev 5 69/115
STM32F303x6/x8 Electrical characteristics
100
Figure 16. Typical application with a 32.768 kHz crystal
Note: An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden
to add one.
6.3.8 Internal clock source characteristics
The parameters given in Table 42 are derived from tests performed under ambient
temperature and supply voltage conditions summarized in Table 20.
High-speed internal (HSI) RC oscillator
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Table 42. HSI oscillator characteristics(1)
1. VDDA = 3.3 V, TA = –40 to 105 °C unless otherwise specified.
Symbol Parameter Conditions Min. Typ. Max. Unit
fHSI Frequency - - 8 - MHz
TRIM HSI user trimming step - - - 1(2)
2. Guaranteed by design, not tested in production.
%
DuCy(HSI) Duty cycle - 45(2) -55
(2) %
ACCHSI
Accuracy of the HSI
oscillator (factory
calibrated)
TA = –40 to 105 °C –2.8(3)
3. Data based on characterization results, not tested in production.
-3.8
(3)
%
TA = –10 to 85 °C –1.9(3) -2.3
(3)
TA = 0 to 85 °C -1.9(3) -2
(3)
TA = 0 to 70 °C -1.3(3) -2
(3)
TA = 0 to 55 °C –1(3) -2
(3)
TA = 25 °C(4)
4. Factory calibrated, parts not soldered
–1 - 1
tsu(HSI)
HSI oscillator startup
time -1
(2) -2
(2) µs
IDDA(HSI)
HSI oscillator power
consumption - - 80 100(2) µA
Electrical characteristics STM32F303x6/x8
70/115 DocID025083 Rev 5
Figure 17. HSI oscillator accuracy characterization results for soldered parts
Low-speed internal (LSI) RC oscillator
6.3.9 PLL characteristics
The parameters given in Table 44 are derived from tests performed under ambient
temperature and supply voltage conditions summarized in Table 20.
Table 43. LSI oscillator characteristics(1)
1. VDDA = 3.3 V, TA = –40 to 105 °C unless otherwise specified.
Symbol Parameter Min. Typ. Max. Unit
fLSI Frequency 30 40 50 kHz
tsu(LSI)(2)
2. Guaranteed by design, not tested in production.
LSI oscillator startup time - - 85 µs
IDD(LSI)(2) LSI oscillator power consumption - 0.75 1.2 µA
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Symbol Parameter
Value
Unit
Min. Typ. Max.
fPLL_IN
PLL input clock(1)
1. Take care of using the appropriate multiplier factors so as to have PLL input clock values compatible with
the range defined by fPLL_OUT
.
1(2) -24
(2) MHz
PLL input clock duty cycle 40(2) -60
(2) %
fPLL_OUT PLL multiplier output clock 16(2) -72MHz
tLOCK PLL lock time - - 200(2) µs
Jitter Cycle-to-cycle jitter - - 300(2)
2. Guaranteed by design, not tested in production.
ps
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STM32F303x6/x8 Electrical characteristics
100
6.3.10 Memory characteristics
Flash memory
The characteristics are given at TA = –40 to 105 °C unless otherwise specified.
6.3.11 EMC characteristics
Susceptibility tests are performed on a sample basis during device characterization.
Functional EMS (electromagnetic susceptibility)
While a simple application is executed on the device (toggling 2 LEDs through I/O ports).
the device is stressed by two electromagnetic events until a failure occurs. The failure is
indicated by the LEDs:
•Electrostatic discharge (ESD) (positive and negative) is applied to all device pins until
a functional disturbance occurs. This test is compliant with the IEC 61000-4-2 standard.
•FTB: A Burst of Fast Transient voltage (positive and negative) is applied to VDD and
VSS through a 100 pF capacitor, until a functional disturbance occurs. This test is
compliant with the IEC 61000-4-4 standard.
A device reset allows normal operations to be resumed.
The test results are given in Table 47. They are based on the EMS levels and classes
defined in “EMC design guide for ST microcontrollers” application note (AN1709).
Table 45. Flash memory characteristics
Symbol Parameter Conditions Min. Typ. Max.(1)
1. Guaranteed by design, not tested in production.
Unit
tprog 16-bit programming time TA = –40 to +105 °C 40 53.5 60 µs
tERASE Page (2 KB) erase time TA = –40 to +105 °C 20 - 40 ms
tME Mass erase time TA = –40 to +105 °C 20 - 40 ms
IDD Supply current
Write mode - - 10 mA
Erase mode - - 12 mA
Table 46. Flash memory endurance and data retention
Symbol Parameter Conditions
Value
Unit
Min.(1)
1. Data based on characterization results, not tested in production.
NEND Endurance TA = –40 to +85 °C (6 suffix versions)
TA = –40 to +105 °C (7 suffix versions) 10 kcycles
tRET Data retention
1 kcycle(2) at TA = 85 °C
2. Cycling performed over the whole temperature range.
30
Years1 kcycle(2) at TA = 105 °C 10
10 kcycles(2) at TA = 55 °C 20
Electrical characteristics STM32F303x6/x8
72/115 DocID025083 Rev 5
Designing hardened software to avoid noise problems
EMC characterization and optimization are performed at component level with a typical
application environment and simplified MCU software. It should be noted that good EMC
performance is highly dependent on the user application and the software in particular.
Therefore it is recommended that the user applies EMC software optimization and
prequalification tests in relation with the EMC level requested for his application.
Software recommendations
The software flowchart must include the management of runaway conditions such as:
•Corrupted program counter
•Unexpected reset
•Critical Data corruption (control registers...)
Prequalification trials
Most of the common failures (unexpected reset and program counter corruption) can be
reproduced by manually forcing a low state on the NRST pin or the Oscillator pins for 1
second.
To complete these trials, ESD stress can be applied directly on the device, over the range of
specification values. When unexpected behavior is detected, the software can be hardened
to prevent unrecoverable errors occurring (see application note “Software techniques for
improving microcontrollers EMC performance” AN1015).
Electromagnetic Interference (EMI)
The electromagnetic field emitted by the device are monitored while a simple application is
executed (toggling 2 LEDs through the I/O ports). This emission test is compliant with
IEC 61967-2 standard which specifies the test board and the pin loading.
Table 47. EMS characteristics
Symbol Parameter Conditions Level/
Class
VFESD
Voltage limits to be applied on any I/O pin to
induce a functional disturbance
VDD = 3.3 V, LQFP100, TA =
+25°C,
fHCLK = 72 MHz
conforms to IEC 61000-4-2
2B
VEFTB
Fast transient voltage burst limits to be
applied through 100 pF on VDD and VSS
pins to induce a functional disturbance
VDD = 3.3 V, LQFP100, TA =
+25°C,
fHCLK = 72 MHz
conforms to IEC 61000-4-4
4A
DocID025083 Rev 5 73/115
STM32F303x6/x8 Electrical characteristics
100
6.3.12 Electrical sensitivity characteristics
Based on three different tests (ESD, LU) using specific measurement methods, the device is
stressed to determine its performance in terms of electrical sensitivity.
Electrostatic discharge (ESD)
Electrostatic discharges (a positive then a negative pulse separated by 1 second) are
applied to the pins of each sample according to each pin combination. The sample size
depends on the number of supply pins in the device (3 parts × (n+1) supply pins). This test
conforms to the JESD22-A114/C101 standard.
Static latch-up
Two complementary static tests are required on six parts to assess the latch-up
performance:
•A supply overvoltage is applied to each power supply pin
•A current injection is applied to each input, output and configurable I/O pin
These tests are compliant with EIA/JESD 78A IC latch-up standard.
Table 48. EMI characteristics
Symbol Parameter Conditions Monitored
frequency band
Max vs. [fHSE/fHCLK]
Unit
8/72 MHz
SEMI Peak level
VDD = 3.6 V, TA =25 °C,
LQFP100 package
compliant with IEC
61967-2
0.1 to 30 MHz 5
dBµV30 to 130 MHz 9
130 MHz to 1GHz 31
SAE EMI Level 4 -
Table 49. ESD absolute maximum ratings
Symbol Ratings Conditions Class Maximum
value(1)
1. Data based on characterization results, not tested in production.
Unit
VESD(HBM
)
Electrostatic discharge
voltage (human body model)
TA = +25 °C,
conforming to JESD22-
A114
22000
V
VESD(CD
M)
Electrostatic discharge
voltage (charge device
model)
TA = +25 °C,
conforming to JESD22-
C101
II 250
Table 50. Electrical sensitivities
Symbol Parameter Conditions Class
LU Static latch-up class TA = +105 °C conforming to JESD78A II level A
Electrical characteristics STM32F303x6/x8
74/115 DocID025083 Rev 5
6.3.13 I/O current injection characteristics
As a general rule, current injection to the I/O pins, due to external voltage below VSS or
above VDD (for standard, 3 V-capable I/O pins) should be avoided during normal product
operation. However, to give an indication of the robustness of the microcontroller in cases
when abnormal injection accidentally happens, susceptibility tests are performed on a
sample basis during device characterization.
Functional susceptibility to I/O current injection
While a simple application is executed on the device, the device is stressed by injecting
current into the I/O pins programmed in floating input mode. While current is injected into
the I/O pin, one at a time, the device is checked for functional failures.
The failure is indicated by an out of range parameter: ADC error above a certain limit (higher
than 5 LSB TUE), out of conventional limits of induced leakage current on adjacent pins (out
of –5 µA/+0 µA range), or other functional failure (for example reset occurrence or oscillator
frequency deviation). The test results are given in Table 51: I/O current injection
susceptibility.
Table 51. I/O current injection susceptibility
Symbol Description
Functional susceptibility
Unit
Negative
injection
Positive
injection
IINJ
Injected current on BOOT0 – 0 NA
mA
Injected current on PC0, PC1, PC2, PC3 (TTa pins)
and PF1 pin (FT pin) -0 +5
Injected current on PA0, PA1, PA2, PA3, PA4, PA5,
PA6, PA7, PC4, PC5, PB0, PB1, PB2, PB12, PB13,
PB14, PB15 with induced leakage current on other
pins from this group less than -100 µA or more than
+900 µA
-5 +5
Injected current on PB11, other TT, FT, and FTf pins – 5 NA
Injected current on all other TC, TTa and RESET
pins – 5 +5
DocID025083 Rev 5 75/115
STM32F303x6/x8 Electrical characteristics
100
Note: It is recommended to add a Schottky diode (pin to ground) to analog pins which may
potentially inject negative currents.
6.3.14 I/O port characteristics
General input/output characteristics
Unless otherwise specified, the parameters given in Table 52 are derived from tests
performed under the conditions summarized in Table 20. All I/Os are CMOS and TTL
compliant.
IINJ
Injected current on PB0, PB1, PB2, PB12, PB13,
PB14, PB15 with induced leakage current on other
pins from this group less than -50 µA
– 5 -
mA
Injected current on PC0, PC1, PC2, PC3, PA0, PA1,
PA2, PA3, PA4, PA5, PA6, PA7, PC4, PC5, PB2,
PB0, PB1, PB12, PB13, PB14, PB15 with induced
leakage current on other pins from this group less
than 400 µA
-+5
Injected current on any other FT and FTf pins – 5 NA
Injected current on any other pins – 5 +5
Table 51. I/O current injection susceptibility (continued)
Symbol Description
Functional susceptibility
Unit
Negative
injection
Positive
injection
Table 52. I/O static characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
VIL
Low-level input
voltage
TT, TC and TTa I/O - - 0.3 VDD+0.07 (1)
V
FT and FTf I/O - - 0.475 VDD-0.2 (1)
BOOT0 - - 0.3 VDD–0.3 (1)
All I/Os except BOOT0 - - 0.3 VDD (2)
VIH
High-level input
voltage
TTa and TT I/O 0.445 VDD+0.398 (1) --
FT and FTf I/O 0.5 VDD+0.2 (1) --
BOOT0 0.2 VDD+0.95 (1) --
All I/Os except BOOT0 0.7 VDD (2) --
Vhys
Schmitt trigger
hysteresis
TT, TC and TTa I/O - 200 (1) -
mVFT and FTf I/O - 100 (1) -
BOOT0 - 300 (1) -
Electrical characteristics STM32F303x6/x8
76/115 DocID025083 Rev 5
All I/Os are CMOS and TTL compliant (no software configuration required). Their
characteristics cover more than the strict CMOS-technology or TTL parameters. The
coverage of these requirements is shown in Figure 18 and Figure 19 for standard I/Os.
Figure 18. TC and TTa I/O input characteristics - CMOS port
Ilkg
Input leakage
current (3)
TC, FT, TT, FTf and TTa
I/O in digital mode
VSS ≤ VIN ≤ VDD
--±0.1
µA
TTa I/O in digital mode
VDD ≤ VIN ≤ VDDA
--1
TTa I/O in analog mode
VSS ≤ VIN ≤ VDDA
--±0.2
FT and FTf I/O(4)
VDD ≤ VIN ≤ 5 V --10
RPU
Weak pull-up
equivalent resistor(5) VIN = VSS 25 40 55 kΩ
RPD
Weak pull-down
equivalent resistor(5) VIN = VDD 25 40 55 kΩ
CIO I/O pin capacitance - - 5 - pF
1. Data based on design simulation.
2. Tested in production.
3. Leakage could be higher than the maximum value. If negative current is injected on adjacent pins. Refer to Table 51: I/O
current injection susceptibility.
4. To sustain a voltage higher than VDD +0.3 V, the internal pull-up/pull-down resistors must be disabled.
5. Pull-up and pull-down resistors are designed with a true resistance in series with a switchable PMOS/NMOS. This
PMOS/NMOS contribution to the series resistance is minimum (~10% order).
Table 52. I/O static characteristics (continued)
Symbol Parameter Conditions Min. Typ. Max. Unit
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STM32F303x6/x8 Electrical characteristics
100
Figure 19. TC and TTa I/O input characteristics - TTL port
Figure 20. 5V- tolerant (FT and FTf) I/O input characteristics - CMOS port
Figure 21. 5V-tolerant (FT and FTf) I/O input characteristics - TTL port
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Electrical characteristics STM32F303x6/x8
78/115 DocID025083 Rev 5
Output driving current
The GPIOs (general-purpose input/output) can sink or source up to +/-8 mA, and sink or
source up to +/- 20 mA (with a relaxed VOL/VOH).
In the user application, the number of I/O pins which can drive current must be limited to
respect the absolute maximum rating specified in Section 6.2:
•The sum of the currents sourced by all the I/Os on VDD, plus the maximum Run
consumption of the MCU sourced on VDD, cannot exceed the absolute maximum rating
ΣIVDD (see Table 18).
•The sum of the currents sunk by all the I/Os on VSS plus the maximum Run
consumption of the MCU sunk on VSS cannot exceed the absolute maximum rating
ΣIVSS (see Table 18).
Output voltage levels
Unless otherwise specified, the parameters given in Table 49: ESD absolute maximum
ratings are derived from tests performed under ambient temperature and VDD supply
voltage conditions summarized in Table 20. All I/Os (FT, TTa and TC unless otherwise
specified) are CMOS and TTL compliant.
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 22 and
Table 63, respectively.
Unless otherwise specified, the parameters given are derived from tests performed under
ambient temperature and VDD supply voltage conditions summarized in Table 20.
Table 53. Output voltage characteristics
Symbol Parameter Conditions Min. Max. Unit
VOL(1) Low-level output voltage for an I/O pin CMOS port(2)
IIO = +8 mA
2.7 V < VDD < 3.6 V
-0.4
V
VOH(3) High- level output voltage for an I/O pin VDD–0.4 -
VOL (1) Low-level output voltage for an I/O pin TTL port(2)
IIO = +8 mA
2.7 V < VDD < 3.6 V
-0.4
VOH (3) High-level output voltage for an I/O pin 2.4 -
VOL(1)(4) Low-level output voltage for an I/O pin IIO = +20 mA
2.7 V < VDD < 3.6 V
-1.3
VOH(3)(4) High-level output voltage for an I/O pin VDD–1.3 -
VOL(1)(4) Low-level output voltage for an I/O pin IIO = +6 mA
2 V < VDD < 2.7 V
-0.4
VOH(3)(4) High-level output voltage for an I/O pin VDD–0.4 -
VOLFM+(1)(4) Low-level output voltage for an FTf I/O pin
in FM+ mode
IIO = +20 mA
2.7 V < VDD < 3.6 V -0.4
1. The IIO current sunk by the device must always respect the absolute maximum rating specified in Table 18 and the sum of
IIO (I/O ports and control pins) must not exceed ΣIIO(PIN).
2. TTL and CMOS outputs are compatible with JEDEC standards JESD36 and JESD52.
3. The IIO current sourced by the device must always respect the absolute maximum rating specified in Table 18 and the sum
of IIO (I/O ports and control pins) must not exceed ΣIIO(PIN).
4. Data based on design simulation.
DocID025083 Rev 5 79/115
STM32F303x6/x8 Electrical characteristics
100
Table 54. I/O AC characteristics(1)
OSPEEDRy
[1:0] value(1) Symbol Parameter Conditions Min. Max. Unit
x0
fmax(IO)out Maximum frequency(2) CL = 50 pF, VDD = 2 V to 3.6 V - 12(3) MHz
tf(IO)out
Output high to low-level
fall time
CL = 50 pF, VDD = 2 V to 3.6 V
- 125(3)
ns
tr(IO)out
Output low to high-level
rise time - 125(3)
01
fmax(IO)out Maximum frequency(2) CL = 50 pF, VDD = 2 V to 3.6 V - 410(3) MHz
tf(IO)out
Output high to low-level
fall time
CL = 50 pF, VDD = 2 V to 3.6 V
-25
(3)
ns
tr(IO)out
Output low to high-level
rise time -25
(3)
11
fmax(IO)out Maximum frequency(2)
CL = 30 pF, VDD = 2.7 V to 3.6 V - 50(3) MHz
CL = 50 pF, VDD = 2.7 V to 3.6 V - 30(3) MHz
CL = 50 pF, VDD = 2 V to 2.7 V - 20(3) MHz
tf(IO)out
Output high to low-level
fall time
CL = 30 pF, VDD = 2.7 V to 3.6 V - 5(3)
ns
CL = 50 pF, VDD = 2.7 V to 3.6 V - 8(3)
CL = 50 pF, VDD = 2 V to 2.7 V - 12(3)
tr(IO)out
Output low to high-level
rise time
CL = 30 pF, VDD = 2.7 V to 3.6 V - 5(3)
CL = 50 pF, VDD = 2.7 V to 3.6 V - 8(3)
CL = 50 pF, VDD = 2 V to 2.7 V - 12(3)
FM+
configuration(4)
fmax(IO)out Maximum frequency(2)
CL = 50 pF, VDD = 2 V to 3.6 V
-2
(4) MHz
tf(IO)out
Output high to low-level
fall time -12
(4)
ns
tr(IO)out
Output low to high-level
rise time -34
(4)
-t
EXTIpw
Pulse width of external
signals detected by the
EXTI controller
-10
(3) -ns
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the RM0364 reference manual for a description of
GPIO Port configuration register.
2. The maximum frequency is defined in Figure 22.
3. Guaranteed by design, not tested in production.
4. The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the STM32F30x and STM32F301xx reference manual
RM0364 for a description of FM+ I/O mode configuration.
Electrical characteristics STM32F303x6/x8
80/115 DocID025083 Rev 5
Figure 22. I/O AC characteristics definition
6.3.15 NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 52).
Unless otherwise specified, the parameters given in Table 55 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 20.
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Table 55. NRST pin characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
VIL(NRST)(1) NRST Input low level voltage - - - 0.3VDD+
0.07(1)
V
VIH(NRST)(1) NRST Input high-level voltage - 0.445VDD+
0.398(1) --
Vhys(NRST) NRST Schmitt trigger voltage hysteresis - - 200 - mV
RPU Weak pull-up equivalent resistor(2) VIN = VSS 25 40 55 kΩ
VF(NRST)(1) NRST Input filtered pulse - - - 100(1) ns
VNF(NRST)(1) NRST Input not filtered pulse - 500(1) --ns
1. Guaranteed by design, not tested in production.
2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series
resistance must be minimum (~10% order).
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STM32F303x6/x8 Electrical characteristics
100
Figure 23. Recommended NRST pin protection
1. The reset network protects the device against parasitic resets.
2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in
Table 55. Otherwise the reset will not be taken into account by the device.
3. The external capacitor on NRST must be placed as close as possible to the device.
4. Place the external capacitor 0.1u F on NRST as close as possible to the chip.
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Electrical characteristics STM32F303x6/x8
82/115 DocID025083 Rev 5
6.3.16 Timer characteristics
The parameters given in Table 56 are guaranteed by design.
Refer to Section 6.3.14: I/O port characteristics for details on the input/output alternate
function characteristics (output compare, input capture, external clock, PWM output).
Table 56. TIMx(1)(2) characteristics
1. TIMx is used as a general term to refer to the TIM1, TIM2, TIM3,TIM15, TIM16 and TIM17 timers.
2. Guaranteed by design, not tested in production.
Symbol Parameter Conditions Min. Max. Unit
tres(TIM) Timer resolution time
-1-
tTIMxCL
K
fTIMxCLK = 72 MHz 13.9 - ns
fTIM1CLK = 144 MHz 6.95 - ns
fEXT
Timer external clock
frequency on CH1 to CH4
-0f
TIMxCLK/2 MHz
fTIMxCLK = 72 MHz 0 36 MHz
ResTIM Timer resolution
TIMx (except TIM2) - 16
bit
TIM2 - 32
tCOUNTER 16-bit counter clock period
- 1 65536 tTIMxCL
K
fTIMxCLK = 72 MHz 0.0139 910 µs
fTIM1CLK = 144 MHz 0.0069 455 µs
tMAX_COUN
T
Maximum possible count
with 32-bit counter
- - 65536 × 65536 tTIMxCL
K
fTIMxCLK = 72 MHz - 59.65 s
fTIM1CLK = 144 MHz - 29.825 s
DocID025083 Rev 5 83/115
STM32F303x6/x8 Electrical characteristics
100
6.3.17 Communication interfaces
I2C interface characteristics
The I2C interface meets the timings requirements of the I2C-bus specification and user
manual rev. 03 for:
•Standard-mode (Sm): with a bit rate up to 100 Kbit/s
•Fast-mode (Fm): with a bit rate up to 400 Kbit/s
•Fast-mode Plus (Fm+): with a bit rate up to 1 Mbit/s.
The I2C timings requirements are guaranteed by design when the I2C peripheral is properly
configured (refer to Reference manual).
The SDA and SCL I/O requirements are met with the following restrictions: the SDA and
SCL I/O pins are not "true" open-drain. When configured as open-drain, the PMOS
connected between the I/O pin and VDD is disabled, but is still present. Only FTf I/O pins
support Fm+ low-level output current maximum requirement. Refer to Section 6.3.14: I/O
port characteristics for the I2C I/O characteristics.
All I2C SDA and SCL I/Os embed an analog filter. Refer to the table below for the analog
filter characteristics:
Table 57. IWDG min./max. timeout period at 40 kHz (LSI) (1)
1. These timings are given for a 40 kHz clock but the microcontroller’s internal RC frequency can vary from 30
to 60 kHz. Moreover, given an exact RC oscillator frequency, the exact timings still depend on the phasing
of the APB interface clock versus the LSI clock so that there is always a full RC period of uncertainty.
Prescaler divider PR[2:0] bits Min. timeout (ms) RL[11:0]=
0x000
Max. timeout (ms) RL[11:0]=
0xFFF
/4 0 0.1 409.6
/8 1 0.2 819.2
/16 2 0.4 1638.4
/32 3 0.8 3276.8
/64 4 1.6 6553.6
/128 5 3.2 13107.2
/256 7 6.4 26214.4
Table 58. WWDG min./max. timeout value at 72 MHz (PCLK)(1)
1. Guaranteed by design, not tested in production.
Prescaler WDGTB Min. timeout value Max. timeout value
1 0 0.05687 3.6409
2 1 0.1137 7.2817
4 2 0.2275 14.564
8 3 0.4551 29.127
Electrical characteristics STM32F303x6/x8
84/115 DocID025083 Rev 5
SPI characteristics
Unless otherwise specified, the parameters given in Table 55 for SPI are derived from tests
performed under ambient temperature, fPCLKx frequency and VDD supply voltage conditions
summarized in Table 20: General operating conditions.
Refer to Section 6.3.14: I/O port characteristics for more details on the input/output alternate
function characteristics (NSS, SCK, MOSI, MISO for SPI).
Table 59. I2C analog filter characteristics(1)
1. Guaranteed by design, not tested in production.
Symbol Parameter Min. Max. Unit
tAF
Maximum pulse width of spikes that are
suppressed by the analog filter. 50(2)
2. Spikes with width below tAF(min.) are filtered.
260(3)
3. Spikes with width above tAF(max.) are not filtered.
ns
Table 60. SPI characteristics(1)
Symbol Parameter Conditions Min Typ Max Unit
fSCK
1/tc(SCK)
SPI clock frequency
Master mode 2.7<VDD<3.6
--
24
MHz
Master mode 2<VDD<3.6 18
Slave mode 2<VDD<3.6 24
Slave mode transmitter/full
duplex
2<VDD<3.6
18(2)
DuCy(SCK)Duty cycle of SPI clock
frequency Slave mode 30 50 70 %
tsu(NSS) NSS setup time Slave mode, SPI presc = 2 4*Tpclk - -
ns
th(NSS) NSS hold time Slave mode, SPI presc = 2 2*Tpclk - -
tw(SCKH)
tw(SCKL)
SCK high and low time Master mode Tpclk-2 Tpclk Tpclk+2
tsu(MI) Data input setup time Master mode 0 - -
tsu(SI) Slave mode 3 - -
th(MI) Data input hold time Master mode 5 - -
th(SI) Slave mode 1 - -
ta(SO) Data output access time Slave mode 10 - 40
tdis(SO) Data output disable time Slave mode 10 - 17
tv(SO) Data output valid time
Slave mode 2.7<VDD<3.6V - 12 20
Slave mode 2<VDD<3.6V - 12 27.5
tv(MO) Master mode - 1.5 5
th(SO) Data output hold time Slave mode 7.5 - -
th(MO) Master mode 0 - -
1. Data based on characterization results, not tested in production.
2. Maximum frequency in Slave transmitter mode is determined by the sum of tv(SO) and tsu(MI) which has to fit into SCK
low or high phase preceding the SCK sampling edge. This value can be achieved when the SPI communicates with a
master having tsu(MI) = 0 while Duty(SCK) = 50%.
DocID025083 Rev 5 85/115
STM32F303x6/x8 Electrical characteristics
100
Figure 24. SPI timing diagram - slave mode and CPHA = 0
Figure 25. SPI timing diagram - slave mode and CPHA = 1(1)
1. Measurement points are done at 0.5VDD and with external CL = 30 pF.
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Electrical characteristics STM32F303x6/x8
86/115 DocID025083 Rev 5
Figure 26. SPI timing diagram - master mode(1)
1. Measurement points are done at 0.5VDD and with external CL = 30 pF.
CAN (controller area network) interface
Refer to Section 6.3.14: I/O port characteristics for more details on the input/output alternate
function characteristics (CAN_TX and CAN_RX).
6.3.18 ADC characteristics
Unless otherwise specified, the parameters given in Table 61 to Table 64 are guaranteed by
design, with conditions summarized in Table 20.
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Table 61. ADC characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
VDDA
Analog supply voltage for
ADC -2-3.6V
IDDA
ADC current consumption
(Figure 27)
Single ended mode, 5
MSPS, - 1011.3 1172.0
µA
Single ended mode, 1
MSPS - 214.7 322.3
Single ended mode, 200
KSPS - 54.7 81.1
Differential mode,5
MSPS, - 1061.5 1243.6
Differential mode, 1
MSPS - 246.6 337.6
Differential mode, 200
KSPS - 56.4 83.0
DocID025083 Rev 5 87/115
STM32F303x6/x8 Electrical characteristics
100
VREF- Negative reference voltage 0 V
fADC ADC clock frequency - 0.14 - 72 MHz
fS Sampling rate
Resolution = 12 bits,
Fast Channel 0.01 - 5.14
MSPS
Resolution = 10 bits,
Fast Channel 0.012 - 6
Resolution = 8 bits,
Fast Channel 0.014 - 7.2
Resolution = 6 bits,
Fast Channel 0.0175 - 9
fTRIG External trigger frequency
fADC = 72 MHz
Resolution = 12 bits - - 5.14 MHz
Resolution = 12 bits - - 14 1/fADC
VAIN Conversion voltage range - 0 - VDDA V
RAIN External input impedance - - - 100 κΩ
CADC
Internal sample and hold
capacitor --5-pF
tCAL Calibration time
fADC = 72 MHz 1.56 µs
- 112 1/fADC
tlatr
Trigger conversion latency
Regular and injected
channels without
conversion abort
CKMODE = 00 1.5 2 2.5 1/fADC
CKMODE = 01 - - 2 1/fADC
CKMODE = 10 - - 2.25 1/fADC
CKMODE = 11 - - 2.125 1/fADC
tlatrinj
Trigger conversion latency
Injected channels aborting
a regular conversion
CKMODE = 00 2.5 3 3.5 1/fADC
CKMODE = 01 - - 3 1/fADC
CKMODE = 10 - - 3.25 1/fADC
CKMODE = 11 - - 3.125 1/fADC
tSSampling time
fADC = 72 MHz 0.021 - 8.35 µs
- 1.5 - 601.5 1/fADC
tADCVREG
_STUP
ADC Voltage Regulator
Start-up time ---10µs
tSTAB Power-up time - 1
conver
sion
cycle
Table 61. ADC characteristics (continued)
Symbol Parameter Conditions Min. Typ. Max. Unit
Electrical characteristics STM32F303x6/x8
88/115 DocID025083 Rev 5
Figure 27. ADC typical current consumption in single-ended and differential modes
tCONV
Total conversion time
(including sampling time)
fADC = 72 MHz
Resolution = 12 bits 0.19 - 8.52 µs
Resolution = 12 bits 14 to 614 (tS for sampling + 12.5 for
successive approximation) 1/fADC
CMIR Common Mode Input
signal ADC differential mode (VSSA+VREF+)/2
-0.18
(VSSA +
VREF+)/2
(VSSA +
VREF+)/2
+ 0.18
V
Table 61. ADC characteristics (continued)
Symbol Parameter Conditions Min. Typ. Max. Unit
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Table 62. Maximum ADC RAIN(1)
Resolution
Sampling
cycle @
72 MHz
Sampling
time [ns] @
72 MHz
RAIN max. (kΩ)
Fast channels(2) Slow
channels
Other
channels(3)
12 bits
1.5 20.83 0.018 NA NA
2.5 34.72 0.150 NA 0.022
4.5 62.50 0.470 0.220 0.180
7.5 104.17 0.820 0.560 0.470
19.5 270.83 2.70 1.80 1.50
61.5 854.17 8.20 6.80 4.70
181.5 2520.83 22.0 18.0 15.0
601.5 8354.17 82.0 68.0 47.0
DocID025083 Rev 5 89/115
STM32F303x6/x8 Electrical characteristics
100
10 bits
1.5 20.83 0.082 NA NA
2.5 34.72 0.270 0.082 0.100
4.5 62.50 0.560 0.390 0.330
7.5 104.17 1.20 0.82 0.68
19.5 270.83 3.30 2.70 2.20
61.5 854.17 10.0 8.2 6.8
181.5 2520.83 33.0 27.0 22.0
601.5 8354.17 100.0 82.0 68.0
8 bits
1.5 20.83 0.150 NA 0.039
2.5 34.72 0.390 0.180 0.180
4.5 62.50 0.820 0.560 0.470
7.5 104.17 1.50 1.20 1.00
19.5 270.83 3.90 3.30 2.70
61.5 854.17 12.00 12.00 8.20
181.5 2520.83 39.00 33.00 27.00
601.5 8354.17 100.00 100.00 82.00
6 bits
1.5 20.83 0.270 0.100 0.150
2.5 34.72 0.560 0.390 0.330
4.5 62.50 1.200 0.820 0.820
7.5 104.17 2.20 1.80 1.50
19.5 270.83 5.60 4.70 3.90
61.5 854.17 18.0 15.0 12.0
181.5 2520.83 56.0 47.0 39.0
601.5 8354.17 100.00 100.0 100.0
1. Data based on characterization results, not tested in production.
2. All fast channels, expect channel on PA6.
3. Channels available on PA6.
Table 62. Maximum ADC RAIN(1) (continued)
Resolution
Sampling
cycle @
72 MHz
Sampling
time [ns] @
72 MHz
RAIN max. (kΩ)
Fast channels(2) Slow
channels
Other
channels(3)
Electrical characteristics STM32F303x6/x8
90/115 DocID025083 Rev 5
Table 63. ADC accuracy - limited test conditions(1)(2)
Symbol Parameter Conditions Min
(3) Typ Max
(3) Unit
ET
To ta l
unadjusted
error
ADC clock freq. ≤ 72 MHz
Sampling freq. ≤ 5 Msps
VDDA = 3.3 V
25°C
Single ended
Fast channel 5.1 Ms - ±4 ±4.5
LSB
Slow channel 4.8 Ms - ±5.5 ±6
Differential
Fast channel 5.1 Ms - ±3.5 ±4
Slow channel 4.8 Ms - ±3.5 ±4
EO Offset error
Single ended
Fast channel 5.1 Ms - ±2 ±2
Slow channel 4.8 Ms - ±1.5 ±2
Differential
Fast channel 5.1 Ms - ±1.5 ±2
Slow channel 4.8 Ms - ±1.5 ±2
EG Gain error
Single ended
Fast channel 5.1 Ms - ±3 ±4
Slow channel 4.8 Ms - ±5 ±5.5
Differential
Fast channel 5.1 Ms - ±3 ±3
Slow channel 4.8 Ms - ±3 ±3.5
ED
Differential
linearity
error
Single ended
Fast channel 5.1 Ms - ±1 ±1
Slow channel 4.8 Ms - ±1 ±1
Differential
Fast channel 5.1 Ms - ±1 ±1
Slow channel 4.8 Ms - ±1 ±1
EL
Integral
linearity
error
Single ended
Fast channel 5.1 Ms - ±1.5 ±2
Slow channel 4.8 Ms - ±2 ±3
Differential
Fast channel 5.1 Ms - ±1.5 ±1.5
Slow channel 4.8 Ms - ±1.5 ±2
ENOB
(4)
Effective
number of
bits
Single ended
Fast channel 5.1 Ms 10.8 10.8 -
bit
Slow channel 4.8 Ms 10.8 10.8 -
Differential
Fast channel 5.1 Ms 11.2 11.3 -
Slow channel 4.8 Ms 11.2 11.3 -
SINAD
(4)
Signal-to-
noise and
distortion
ratio
Single ended
Fast channel 5.1 Ms 66 67 -
dB
Slow channel 4.8 Ms 66 67 -
Differential
Fast channel 5.1 Ms 69 70 -
Slow channel 4.8 Ms 69 70 -
DocID025083 Rev 5 91/115
STM32F303x6/x8 Electrical characteristics
100
SNR(4) Signal-to-
noise ratio
ADC clock freq. ≤ 72 MHz
Sampling freq ≤ 5 Msps
VDDA = 3.3 V
25°C
Single ended
Fast channel 5.1 Ms 66 67 -
dB
Slow channel 4.8 Ms 66 67 -
Differential
Fast channel 5.1 Ms 69 70 -
Slow channel 4.8 Ms 69 70 -
THD(4)
To ta l
harmonic
distortion
Single ended
Fast channel 5.1 Ms - -80 -80
Slow channel 4.8 Ms - -78 -77
Differential
Fast channel 5.1 Ms - -83 -82
Slow channel 4.8 Ms - -81 -80
1. ADC DC accuracy values are measured after internal calibration.
2. ADC accuracy vs. negative Injection Current: Injecting negative current on any analog input pins should be avoided as this
significantly reduces the accuracy of the conversion being performed on another analog input. It is recommended to add a
Schottky diode (pin to ground) to analog pins which may potentially inject negative current.
Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.14 does not affect the ADC
accuracy.
3. Data based on characterization results, not tested in production.
4. Value measured with a -0.5 dB full scale 50 kHz sine wave input signal.
Table 63. ADC accuracy - limited test conditions(1)(2) (continued)
Symbol Parameter Conditions Min
(3) Typ Max
(3) Unit
Table 64. ADC accuracy (1)(2)(3)
Symbol Parameter Conditions Min(4) Max(4) Unit
ET
Tot al
unadjusted
error
ADC clock freq. ≤ 72 MHz,
Sampling freq. ≤ 5 Msps
2.0 V ≤ VDDA ≤ 3.6 V
Single ended Fast channel 5.1 Ms - ±6.5 LSB
Slow channel 4.8 Ms - ±6.5
Differential Fast channel 5.1 Ms - ±4
Slow channel 4.8 Ms - ±4.5
EO Offset error
Single ended Fast channel 5.1 Ms - ±3
Slow channel 4.8 Ms - ±3
Differential Fast channel 5.1 Ms - ±2.5
Slow channel 4.8 Ms - ±2.5
EG Gain error
Single ended Fast channel 5.1 Ms - ±6
Slow channel 4.8 Ms - ±6
Differential Fast channel 5.1 Ms - ±3.5
Slow channel 4.8 Ms - ±4
ED
Differential
linearity
error
Single ended Fast channel 5.1 Ms - ±1.5
Slow channel 4.8 Ms - ±1.5
Differential Fast channel 5.1 Ms - ±1.5
Slow channel 4.8 Ms - ±1.5
Electrical characteristics STM32F303x6/x8
92/115 DocID025083 Rev 5
EL
Integral
linearity
error
ADC clock freq. ≤ 72 MHz,
Sampling freq. ≤ 5 Msps
2.0 V ≤ VDDA ≤ 3.6 V
Single ended Fast channel 5.1 Ms - ±3
Slow channel 4.8 Ms - ±3.5
Differential Fast channel 5.1 Ms - ±2
Slow channel 4.8 Ms - ±2.5
ENOB
(5)
Effective
number of
bits
Single ended Fast channel 5.1 Ms 10.4 - bits
Slow channel 4.8 Ms 10.4 -
Differential Fast channel 5.1 Ms 10.8 -
Slow channel 4.8 Ms 10.8 -
SINAD
(5)
Signal-to-
noise and
distortion
ratio
Single ended Fast channel 5.1 Ms 64 - dB
Slow channel 4.8 Ms 63 -
Differential Fast channel 5.1 Ms 67 -
Slow channel 4.8 Ms 67 -
SNR(5) Signal-to-
noise ratio
ADC clock freq. ≤ 72 MHz,
Sampling freq ≤ 5 Msps,
2.0 V ≤ VDDA ≤ 3.6 V
Single ended Fast channel 5.1 Ms 64 - dB
Slow channel 4.8 Ms 64 -
Differential Fast channel 5.1 Ms 67 -
Slow channel 4.8 Ms 67 -
THD(5)
Tot al
harmonic
distortion
Single ended Fast channel 5.1 Ms - -75
Slow channel 4.8 Ms - -75
Differential Fast channel 5.1 Ms - -79
Slow channel 4.8 Ms - -78
1. ADC DC accuracy values are measured after internal calibration.
2. ADC accuracy vs. negative Injection Current: Injecting negative current on any analog input pins should be avoided as this
significantly reduces the accuracy of the conversion being performed on another analog input. It is recommended to add a
Schottky diode (pin to ground) to analog pins which may potentially inject negative current.
Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.14 does not affect the ADC
accuracy.
3. Better performance may be achieved in restricted VDDA, frequency and temperature ranges.
4. Data based on characterization results, not tested in production.
5. Value measured with a -0.5 dB full scale 50 kHz sine wave input signal.
Table 64. ADC accuracy (1)(2)(3) (continued)
Symbol Parameter Conditions Min(4) Max(4) Unit
DocID025083 Rev 5 93/115
STM32F303x6/x8 Electrical characteristics
100
Figure 28. ADC accuracy characteristics
Table 65. ADC accuracy(1)(2) at 1MSPS
Symbol Parameter Test conditions Typ Max(3) Unit
ET Total unadjusted error
ADC Freq ≤ 72 MHz
Sampling Freq ≤ 1MSPS
2 V ≤ VDDA = VREF+ ≤ 3.6 V
Single-ended mode
Fast channel ±2.5 ±5
LSB
Slow channel ±3.5 ±5
EO Offset error
Fast channel ±1 ±2.5
Slow channel ±1.5 ±2.5
EG Gain error
Fast channel ±2 ±3
Slow channel ±3 ±4
ED Differential linearity error
Fast channel ±0.7 ± 2
Slow channel ±0.7 ±2
EL Integral linearity error
Fast channel ±1 ±3
Slow channel ±1.2 ±3
1. ADC DC accuracy values are measured after internal calibration.
2. ADC accuracy vs. negative Injection Current: Injecting negative current on any analog input pins should be avoided as this
significantly reduces the accuracy of the conversion being performed on another analog input. It is recommended to add a
Schottky diode (pin to ground) to analog pins which may potentially inject negative current. Any positive injection current
within the limits specified for IINJ(PIN) and ∑IINJ(PIN) in Section 6.3.14: I/O port characteristics does not affect the ADC
accuracy.
3. Data based on characterization results, not tested in production.
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Electrical characteristics STM32F303x6/x8
94/115 DocID025083 Rev 5
Figure 29. Typical connection diagram using the ADC
1. Refer to Table 61 for the values of RAIN.
2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the
pad capacitance (roughly 7 pF). A high Cparasitic value will downgrade conversion accuracy. To remedy
this, fADC should be reduced.
General PCB design guidelines
Power supply decoupling should be performed as shown in Figure 10: Power-supply
scheme. The 10 nF capacitor should be ceramic (good quality) and it should be placed as
close as possible to the chip.
6.3.19 DAC electrical specifications
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Table 66. DAC characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
VDDA Analog supply voltage - 2.4 - 3.6 V
RLOAD(1) Resistive load DAC output buffer ON (to VSSA )5- - kΩ
RLOAD(1) Resistive load DAC output buffer ON (to VDDA)25- - kΩ
RO(1) Output impedance DAC output buffer OFF - - 15 kΩ
CLOAD(1) Capacitive load DAC output buffer ON - - 50 pF
VDAC_OUT(
1)
Voltage on DAC_OUT
output
Corresponds to 12-bit input code
(0x0E0) to (0xF1C) at VDDA = 3.6 V
and (0x155) and (0xEAB) at VDDA =
2.4 V
0.2 - VDDA – 0.2 V
DAC output buffer OFF
-0.5 - mV
--V
DDA– 1LSB V
IDDA(3)
DAC DC current
consumption in quiescent
mode(2)
With no load, middle code (0x800)
on the input - - 380 µA
With no load, worst code (0xF1C) on
the input. - - 480 µA
DocID025083 Rev 5 95/115
STM32F303x6/x8 Electrical characteristics
100
DNL(3)
Differential non linearity
Difference between two
consecutive code-1LSB)
Given for a 10-bit input code
DAC1 channel 1 -- ±0.5 LSB
Given for a 12-bit input code
DAC1 channel 1 -- ±2 LSB
Given for a 10-bit input code
DAC1 channel 2 & DAC2 channel 1 ---0.75/+0.25LSB
Given for a 12-bit input code
DAC1 channel 2 & DAC2 channel 1 -- -3/+1LSB
INL(3)
Integral non linearity
(difference between
measured value at Code i
and the value at Code i on a
line drawn between Code 0
and last Code 4095)
Given for a 10-bit input code - - ±1 LSB
Given for a 12-bit input code - - ±4 LSB
Offset(3)
Offset error
(difference between
measured value at Code
(0x800) and the ideal value
= VDDA/2)
---±10mV
Given for a 10-bit input code at
VDDA = 3.6 V -- ±3LSB
Given for a 12-bit input code - - ±12 LSB
Gain
error(3) Gain error Given for a 12-bit input code - - ±0.5 %
tSETTLING(3
)
Settling time (full scale: for
a 12-bit input code
transition between the
lowest and the highest input
codes when DAC_OUT
reaches final value ±1LSB
CLOAD ≤ 50 pF, RLOAD ≥ 5 kΩ-3 4 µs
Update
rate(3)
Max frequency for a correct
DAC_OUT change when
small variation in the input
code (from code i to
i+1LSB)
CLOAD ≤ 50 pF, RLOAD ≥ 5 kΩ-- 1 MS/
s
Iskink Output sink current DAC buffer ON
Output level higher than 0.2 V 100 - - µA
tWAKEUP(3)
Wakeup time from off state
(Setting the ENx bit in the
DAC Control register)
CLOAD ≤ 50 pF, RLOAD ≥ 5 kΩ-6.5 10 µs
PSRR+ (1)
Power supply rejection ratio
(to VDDA) (static DC
measurement
No RLOAD, CLOAD = 50 pF - –67 –40 dB
1. Guaranteed by design, not tested in production.
2. Quiescent mode refers to the state of the DAC a keeping steady value on the output, so no dynamic consumption is
involved.
3. Data based on characterization results, not tested in production.
Table 66. DAC characteristics (continued)
Symbol Parameter Conditions Min. Typ. Max. Unit
Electrical characteristics STM32F303x6/x8
96/115 DocID025083 Rev 5
Figure 30. 12-bit buffered /non-buffered DAC
1. The DAC integrates an output buffer that can be used to reduce the output impedance and to drive external
loads directly without the use of an external operational amplifier. The buffer can be bypassed by
configuring the BOFFx bit in the DAC_CR register.
6.3.20 Comparator characteristics
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Table 67. Comparator characteristics(1)
Symbol Parameter Conditions Min. Typ. Max. Unit
VDDA Analog supply voltage - 2 - 3.6 V
VIN
Comparator input voltage
range -0-V
DDA -
VBG Scaler input voltage - - VREFINIT --
VSC Scaler offset voltage - - ±5 ±10 mV
tS_SC
VREFINT scaler startup time
from power down
First VREFINT scaler activation
after device power on --1
(2) s
Next activations - - 0.2 ms
tSTART Comparator startup time
VDDA ≥ 2.7 V - - 4
µs
VDDA < 2.7 V - - 10
tD
Propagation delay for
200 mV step with 100 mV
overdrive
VDDA ≥ 2.7 V - 25 28
ns
VDDA < 2.7 V - 28 30
Propagation delay for full
range step with 100 mV
overdrive
VDDA ≥ 2.7 V - 32 35
VDDA < 2.7 V - 35 40
VOFFSET Comparator offset error
VDDA ≥ 2.7 V - ±5±10
mV
VDDA < 2.7 V - - ±25
TVOFFSET Total offset variation Full temperature range - - 3 mV
IDD(COMP)
COMP current
consumption - - 400 600 µA
1. Guaranteed by design, not tested in production.
2. For more details and conditions see Figure 31: Maximum VREFINT scaler startup time from power-down.
DocID025083 Rev 5 97/115
STM32F303x6/x8 Electrical characteristics
100
Figure 31. Maximum VREFINT scaler startup time from power-down
6.3.21 Operational amplifier characteristics
Table 68. Operational amplifier characteristics(1)
Symbol Parameter Condition Min. Typ. Max. Unit
VDDA Analog supply voltage - 2.4 - 3.6 V
CMIR Common mode input range - 0 - VDDA V
VIOFFSET Input offset voltage
Maximum
calibration range
25°C, No Load
on output. --4
mV
All
voltage/Temp. --6
After offset
calibration
25°C, No Load
on output. --1.6
All
voltage/Temp. --3
ΔVIOFFSET Input offset voltage drift - - 5 - µV/°C
ILOAD Drive current - - - 500 µA
IDDOPAMP Consumption No load,
quiescent mode - 690 1450 µA
CMRR Common mode rejection ratio - - 90 - dB
PSRR Power supply rejection ratio DC 73 117 - dB
GBW Bandwidth - - 8.2 - MHz
SR Slew rate - - 4.7 - V/µs
RLOAD Resistive load - 4 - - kΩ
CLOAD Capacitive load - - - 50 pF
Electrical characteristics STM32F303x6/x8
98/115 DocID025083 Rev 5
VOHSAT High saturation voltage(2)
Rload = min,
Input at VDDA.VDDA-100 -
mV
Rload = 20K,
Input at VDDA.VDDA-20 -
VOLSAT Low saturation voltage
Rload = min,
input at 0 V --100
Rload = 20K,
input at 0 V. --20
ϕm Phase margin - - 62 - °
tOFFTRIM
Offset trim time: during calibration,
minimum time needed between two
steps to have 1 mV accuracy
---2ms
tWAKEUP Wake up time from OFF state.
CLOAD ≤ 50 pf,
RLOAD ≥ 4 kΩ,
Follower
configuration
-2.85µs
tS_OPAM_VOUT ADC sampling time when reading the OPAMP output 400 - - ns
PGA gain Non inverting gain value -
-2--
-4--
-8--
-16--
Rnetwork
R2/R1 internal resistance values in
PGA mode (3)
Gain=2 - 5.4/5.4 -
kΩ
Gain=4 - 16.2/5.4 -
Gain=8 - 37.8/5.4 -
Gain=16 - 40.5/2.7 -
PGA gain error PGA gain error - -1% - 1% -
Ibias OPAMP input bias current - - - ±0.2(4) µA
PGA BW PGA bandwidth for different non
inverting gain
PGA Gain = 2,
Cload = 50pF,
Rload = 4 KΩ
-4-
MHz
PGA Gain = 4,
Cload = 50pF,
Rload = 4 KΩ
-2-
PGA Gain = 8,
Cload = 50pF,
Rload = 4 KΩ
-1-
PGA Gain = 16,
Cload = 50pF,
Rload = 4 KΩ
-0.5-
Table 68. Operational amplifier characteristics(1) (continued)
Symbol Parameter Condition Min. Typ. Max. Unit
DocID025083 Rev 5 99/115
STM32F303x6/x8 Electrical characteristics
100
Figure 32. OPAMP Voltage Noise versus Frequency
en Voltage noise density
@ 1KHz, Output
loaded with
4 KΩ
- 109 -
@ 10KHz,
Output loaded
with 4 KΩ
-43-
1. Guaranteed by design, not tested in production.
2. The saturation voltage can also be limited by the Iload
3. R2 is the internal resistance between OPAMP output and OPAMP inverting input.
R1 is the internal resistance between OPAMP inverting input and ground.
The PGA gain =1+R2/R1
4. Mostly TTa I/O leakage, when used in analog mode.
Table 68. Operational amplifier characteristics(1) (continued)
Symbol Parameter Condition Min. Typ. Max. Unit
nV
Hz
-----------
Electrical characteristics STM32F303x6/x8
100/115 DocID025083 Rev 5
6.3.22 Temperature sensor (TS) characteristics
6.3.23 VBAT monitoring characteristics
Table 69. Temperature sensor (TS) characteristics
Symbol Parameter Min. Typ. Max. Unit
TL(1)
1. Guaranteed by design, not tested in production.
VSENSE linearity with temperature - ±1±2°C
Avg_Slope(1) Average slope 4.0 4.3 4.6 mV/°C
V25 Voltage at 25 °C 1.34 1.43 1.52 V
tSTART(1) Startup time 4 - 10 µs
TS_temp(1)(2)
2. Shortest sampling time can be determined in the application by multiple iterations.
ADC sampling time when reading the
temperature 2.2 - - µs
Table 70. Temperature sensor (TS) calibration values
Calibration value name Description Memory address
TS_CAL1
TS ADC raw data acquired at
temperature of 30 °C,
VDDA= 3.3 V
0x1FFF F7B8 - 0x1FFF F7B9
TS_CAL2
TS ADC raw data acquired at
temperature of 110 °C
VDDA= 3.3 V
0x1FFF F7C2 - 0x1FFF F7C3
Table 71. VBAT monitoring characteristics
Symbol Parameter Min. Typ. Max. Unit
R Resistor bridge for VBAT -50-KΩ
QRatio on V
BAT measurement - 2 - -
Er(1)
1. Guaranteed by design, not tested in production.
Error on Q -1 - +1 %
TS_vbat(1)(2)
2. Shortest sampling time can be determined in the application by multiple iterations.
ADC sampling time when reading the VBAT
1mV accuracy 2.2 - - µs
DocID025083 Rev 5 101/115
STM32F303x6/x8 Package information
112
7 Package information
7.1 Package mechanical data
To meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Package information STM32F303x6/x8
102/115 DocID025083 Rev 5
7.2 LQFP32 package information
LQFP32 is a 32-pin, 7 x 7mm low-profile quad flat package.
Figure 33. LQFP32 package outline
1. Drawing is not to scale.
Table 72. LQFP32 mechanical data
Symbol
Millimeters Inches(1)
Min. Typ. Max. Min. Typ. Max.
A - - 1.600 - - 0.0630
A1 0.050 - 0.150 0.0020 - 0.0059
A2 1.350 1.400 1.450 0.0531 0.0551 0.0571
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STM32F303x6/x8 Package information
112
Figure 34. Recommended footprint for the LQFP32 package
1. Drawing is not to scale.
2. Dimensions are expressed in millimeters.
b 0.300 0.370 0.450 0.0118 0.0146 0.0177
c 0.090 - 0.200 0.0035 - 0.0079
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ccc - - 0.100 - - 0.0039
1. Values in inches are converted from mm and rounded to 4 decimal digits.
Table 72. LQFP32 mechanical data (continued)
Symbol
Millimeters Inches(1)
Min. Typ. Max. Min. Typ. Max.
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Package information STM32F303x6/x8
104/115 DocID025083 Rev 5
Device marking for LQFP32
The following figure gives an example of topside marking orientation versus pin 1 identifier
location.
Figure 35. LQFP32 marking example (package top view)
1. Parts marked as “ES”,”E” or accompanied by an Engineering Sample notification letter, are not yet
qualified and therefore not yet ready to be used in production and any consequences deriving from such
usage will not be at ST charge. In no event, ST will be liable for any customer usage of these engineering
samples in production. ST Quality has to be contacted prior to any decision to use these Engineering
samples to run qualification activity.
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STM32F303x6/x8 Package information
112
7.3 LQFP48 package information
LQFP48 is a 48-pin, 7 x 7mm low-profile quad flat package.
Figure 36. LQFP48 package outline
1. Drawing is not to scale.
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Table 73. LQFP48 package mechanical data
Symbol
millimeters inches(1)
Min Typ Max Min Typ Max
A - - 1.600 - - 0.0630
A1 0.050 - 0.150 0.0020 - 0.0059
A2 1.350 1.400 1.450 0.0531 0.0551 0.0571
b 0.170 0.220 0.270 0.0067 0.0087 0.0106
c 0.090 - 0.200 0.0035 - 0.0079
D 8.800 9.000 9.200 0.3465 0.3543 0.3622
D1 6.800 7.000 7.200 0.2677 0.2756 0.2835
D3 - 5.500 - - 0.2165 -
Package information STM32F303x6/x8
106/115 DocID025083 Rev 5
Figure 37. Recommended footprint for the LQFP48 package
1. Drawing is not to scale.
2. Dimensions are in millimeters.
E 8.800 9.000 9.200 0.3465 0.3543 0.3622
E1 6.800 7.000 7.200 0.2677 0.2756 0.2835
E3 - 5.500 - - 0.2165 -
e - 0.500 - - 0.0197 -
L 0.450 0.600 0.750 0.0177 0.0236 0.0295
L1 - 1.000 - 0.0394 -
k 0°3.5°7° 0°3.5°7°
ccc - - 0.080 - - 0.0031
1. Values in inches are converted from mm and rounded to 4 decimal digits.
Table 73. LQFP48 package mechanical data (continued)
Symbol
millimeters inches(1)
Min Typ Max Min Typ Max
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STM32F303x6/x8 Package information
112
Device marking for LQFP48
The following figure gives an example of topside marking orientation versus pin 1 identifier
location.
Figure 38. LQFP48 marking example (package top view)
1. Parts marked as “ES”,”E” or accompanied by an Engineering Sample notification letter, are not yet
qualified and therefore not yet ready to be used in production and any consequences deriving from such
usage will not be at ST charge. In no event, ST will be liable for any customer usage of these engineering
samples in production. ST Quality has to be contacted prior to any decision to use these Engineering
samples to run qualification activity.
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108/115 DocID025083 Rev 5
7.4 LQFP64 package information
LQFP64 is a 64-pin, 10 x 10 mm low-profile quad flat package.
Figure 39. LQFP64 package outline
1. Drawing is not to scale.
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Table 74. LQFP64 package mechanical data
Symbol
millimeters inches(1)
Min Typ Max Min Typ Max
A - - 1.600 - - 0.0630
A1 0.050 - 0.150 0.0020 - 0.0059
A2 1.350 1.400 1.450 0.0531 0.0551 0.0571
b 0.170 0.220 0.270 0.0067 0.0087 0.0106
c 0.090 - 0.200 0.0035 - 0.0079
D 11.800 12.000 - - 0.4724 -
D1 9.800 10.000 - - 0.3937 -
E - 12.000 - - 0.4724 -
E1 - 10.000 - - 0.3937 -
e - 0.500 - - 0.0197 -
DocID025083 Rev 5 109/115
STM32F303x6/x8 Package information
112
Figure 40. Recommended footprint for the LQFP64 package
1. Drawing is not to scale.
2. Dimensions are in millimeters.
θ0° 3.5° 7° 0° 3.5° 7°
L 0.450 0.600 0.750 0.0177 0.0236 0.0295
L1 - 1.000 - - 0.0394 -
N
Number of pins
64
1. Values in inches are converted from mm and rounded to 4 decimal digits.
Table 74. LQFP64 package mechanical data (continued)
Symbol
millimeters inches(1)
Min Typ Max Min Typ Max
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Package information STM32F303x6/x8
110/115 DocID025083 Rev 5
Device marking for LQFP64
The following figure gives an example of topside marking orientation versus pin 1 identifier
location.
Figure 41. LQFP64 marking example (package top view)
1. Parts marked as “ES”,”E” or accompanied by an Engineering Sample notification letter, are not yet
qualified and therefore not yet ready to be used in production and any consequences deriving from such
usage will not be at ST charge. In no event, ST will be liable for any customer usage of these engineering
samples in production. ST Quality has to be contacted prior to any decision to use these Engineering
samples to run qualification activity.
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DocID025083 Rev 5 111/115
STM32F303x6/x8 Package information
112
7.5 Thermal characteristics
The maximum chip-junction temperature, TJ max, in degrees Celsius, may be calculated
using the following equation:
TJ max = TA max + (PD max x Θ
JA)
Where:
•TA max is the maximum ambient temperature in °C,
•Θ
JA is the package junction-to-ambient thermal resistance, in °C/W,
•PD max is the sum of PINT max and PI/O max (PD max = PINT max + PI/O max),
•PINT max is the product of IDD and VDD, expressed in Watts. This is the maximum chip
internal power.
PI/O max represents the maximum power dissipation on output pins where:
PI/O max = Σ (VOL × IOL) + Σ((VDD – VOH) × IOH),
taking into account the actual VOL / IOL and VOH / IOH of the I/Os at low and high level in the
application.
7.5.1 Reference document
JESD51-2 Integrated Circuits Thermal Test Method Environment Conditions - Natural
Convection (Still Air). Available from www.jedec.org.
7.5.2 Selecting the product temperature range
When ordering the microcontroller, the temperature range is specified in the ordering
information scheme shown in Table 76: Ordering information scheme.
Each temperature range suffix corresponds to a specific guaranteed ambient temperature at
maximum dissipation and, to a specific maximum junction temperature.
As applications do not commonly use the STM32F303x6/8 at maximum dissipation, it is
useful to calculate the exact power consumption and junction temperature to determine
which temperature range will be best suited to the application.
The following examples show how to calculate the temperature range needed for a given
application.
Example: high-performance application
Assuming the following application conditions:
Maximum ambient temperature TAmax = 82 °C (measured according to JESD51-2),
IDDmax = 50 mA, VDD = 3.5 V, maximum 20 I/Os used at the same time in output at low
Table 75. Package thermal characteristics
Symbol Parameter Value Unit
Θ
JA
Thermal resistance junction-ambient
LQFP64 - 10 × 10 mm / 0.5 mm pitch 45°C/W °C/W
Θ
JA
Thermal resistance junction-ambient
LQFP32 - 7 × 7 mm / 0.8 mm pitch 60°C/W °C/W
Package information STM32F303x6/x8
112/115 DocID025083 Rev 5
level with IOL = 8 mA, VOL= 0.4 V and maximum 8 I/Os used at the same time in output
mode at low level with IOL = 20 mA, VOL= 1.3 V
PINTmax = 50 mA × 3.5 V = 175 mW
PIOmax = 20 × 8 mA × 0.4 V + 8 × 20 mA × 1.3 V = 272 mW
This gives: PINTmax = 175 mW and PIOmax = 272 mW
PDmax = 175 + 272 = 447 mW
Thus: PDmax = 447 mW
Using the values obtained in Table 75 TJmax is calculated as follows:
– For LQFP48, 55 °C/W
TJmax = 82 °C + (55 °C/W × 236.6 mW) = 82 °C + 13.01 °C = 95.01°C
This is within the range of the suffix 6 version parts (–40 < TJ < 105 °C).
In this case, parts must be ordered at least with the temperature range suffix 6 (see
Table 76: Ordering information scheme).
DocID025083 Rev 5 113/115
STM32F303x6/x8 Part numbering
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8 Part numbering
Table 76. Ordering information scheme
Example: STM32 F 303 C 8 T 6 xxx
Device family
STM32 = ARM®-based 32-bit microcontroller
Product type
F = general-purpose
Device subfamily
303 = STM32F303
Pin count
K = 32 pins
C = 48 pins
R = 64 pins
Flash memory size
6 = 32 Kbytes of Flash memory
8 = 64 Kbytes of Flash memory
Package
T = LQFP
Temperature range
6 = Industrial temperature range, –40 to 85 °C
7 = Industrial temperature range, –40 to 105 °C
Options
xxx = programmed parts
TR = tape and reel
Revision history STM32F303x6/x8
114/115 DocID025083 Rev 5
9 Revision history
Table 77. Document revision history
Date Revision Changes
11-Apr-2014 1 Initial release.
9-Dec-2014 2
Updated:
Table 73: Package thermal characteristics: remove Note 1.
Table 17: Voltage characteristics: added line in VIN
Table 35: Low-power mode wakeup timings: updated Max
values
Table 40: HSI oscillator characteristics (Accuracy of the
oscillator)
Table 40: HSI oscillator characteristics (Accuracy of the
oscillator)
Table 54: TIMx characteristics
Table 59: ADC characteristics
Table 34: Peripheral current consumption
Table 2: STM32F303x6/8 family device features and
peripherals count
Figure 17: HSI oscillator accuracy characterization results for
soldered parts
Updated notes of Table 31: Typical current consumption in
Run mode, code with data processing running from Flash and
Table 32: Typical current consumption in Sleep mode, code
running from Flash or RAM.
09-May-2015 4 Updated Section Table 14.: STM32F303x6/8 pin definitions
and Section Table 15.: Alternate functions
2-Feb-2015 3
Updated:
Figure 1: STM32F303x6/8 block diagram
Table 40: HSE oscillator characteristics
Table 45: Flash memory characteristics
Added Figure 13: High-speed external clock source AC timing
diagram
05-Oct-2016 5
Updated:
Section Table 66.: DAC characteristics, Section Table 61.:
ADC characteristics,Table 55: NRST pin characteristics,
Figure 2: Clock tree,Table 14: STM32F303x6/8 pin
definitions,Table 68: Operational amplifier characteristics,
Figure 20: 5V- tolerant (FT and FTf) I/O input characteristics -
CMOS port, Table 24: Embedded internal reference voltage,
Table 41: LSE oscillator characteristics (fLSE = 32.768 kHz).
Added:
Table 37: Wakeup time using USART.
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