Datasheet

STM32F051x Pinouts and pin description
Doc ID 022265 Rev 3 29/105
Table 13. Pin definitions
Pin number
Pin name
(function after
reset)
Pin type
I/O structure
Notes
Pin functions
LQFP64 LQFP48 LQFP32
UFQFPN32
Alternate functions Additional functions
1 1 - - VBAT S Backup power supply
22- - PC13 I/OTC
(1)(2)
RTC_TAMP1,
RTC_TS, RTC_OUT,
WKUP2
33- -
PC14-OSC32_IN
(PC14)
I/O TC
(1)(2)
OSC32_IN
44- -
PC15-
OSC32_OUT
(PC15)
I/O TC
(1)(2)
OSC32_OUT
5522
PF0-OSC_IN
(PF0)
I/O FT OSC_IN
6633
PF1-OSC_OUT
(PF1)
I/O FT OSC_OUT
7744 NRST I/ORST Device reset input / internal reset output (active low)
8 - - - PC0 I/O TTa EVENTOUT ADC_IN10
9 - - - PC1 I/O TTa EVENTOUT ADC_IN11
10 - - - PC2 I/O TTa EVENTOUT ADC_IN12
11 - - - PC3 I/O TTa EVENTOUT ADC_IN13
12 8 - 0 VSSA S Analog ground
13 9 5 5 VDDA S Analog power supply
14 10 6 6 PA0 I/O TTa
USART2_CTS,
TIM2_CH1_ETR,
COMP1_OUT,
TSC_G1_IO1
ADC_IN0,
COMP1_INM6,
RTC_TAMP2,
WKUP1
15 11 7 7 PA1 I/O TTa
USART2_RTS, TIM2_CH2,
TSC_G1_IO2, EVENTOUT
ADC_IN1,
COMP1_INP
16 12 8 8 PA2 I/O TTa
USART2_TX, TIM2_CH3,
TIM15_CH1,
COMP2_OUT,
TSC_G1_IO3
ADC_IN2,
COMP2_INM6
17 13 9 9 PA3 I/O TTa
USART2_RX, TIM2_CH4,
TIM15_CH2, TSC_G1_IO4
ADC_IN3,
COMP2_INP
18 - - - PF4 I/O FT EVENTOUT
19 - - - PF5 I/O FT EVENTOUT