STM32F051X4 datasheet(36/122 Pages) STMICROELECTRONICS

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Pinouts and pin descriptions

STM32F051x4 STM32F051x6 STM32F051x8

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DocID022265 Rev 7

58 D3 42 C4 29 29

PB6

I/O

FTf

I2C1_SCL,

USART1_TX,

TIM16_CH1N,

TSC_G5_IO3

59 C3 43 A4 30 30

PB7

I/O

FTf

I2C1_SDA,

USART1_RX,

TIM17_CH1N,

TSC_G5_IO4

60 B4 44 B4 31 31

BOOT0

Boot memory selection

61 B3 45

PB8

I/O

FTf

(4)(5)

I2C1_SCL,

CEC,

TIM16_CH1,

TSC_SYNC

62 A3 46

PB9

I/O

FTf

(5)

I2C1_SDA,

IR_OUT,

TIM17_CH1,

EVENTOUT

63 D5 47 D6 32

VSS

Ground

64 E5 48 A5

VDD

Digital power supply

1. PC13, PC14 and PC15 are supplied through the power switch. Since the switch only sinks a limited amount of current

(3 mA), the use of GPIOs 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).

2. After the first RTC domain power-up, PC13, PC14 and PC15 operate as GPIOs. Their function then depends on the content

of the RTC registers which are not reset by the main reset. For details on how to manage these GPIOs, refer to the RTC

domain and RTC register descriptions in the reference manual.

3. Distinct VSSA pin is only available on packages with 48 and more pins. For all other packages, the pin number corresponds

to the VSS pin to which VSSA pad of the silicon die is connected.

4. On the LQFP32 package, PB2 and PB8 must be set to defined levels by software, as their corresponding pads on the

silicon die are left unconnected. Apply the same recommendations as for unconnected pins.

5. On the WLCSP36 package, PB8, PB9, PB10, PB11, PB12, PB13, PB14 and PB15 must be set to defined levels by

software, as their corresponding pads on the silicon die are left unconnected. Apply the same recommendations as for

unconnected pins.

6. After reset, these pins are configured as SWDIO and SWCLK alternate functions, and the internal pull-up on the SWDIO pin

and the internal pull-down on the SWCLK pin are activated.

Table 13. Pin definitions (continued)

Pin number

Pin name

(function upon

reset)

Pin functions

Alternate functions

Additional

functions

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