STM32F051K4 datasheet(32/104 Pages) STMICROELECTRONICS

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Pinouts and pin description

STM32F051x

32/105

Doc ID 022265 Rev 3

PB5

I/O

SPI1_MOSI/I2S1_SD,

I2C1_SMBA, TIM16_BKIN,

TIM3_CH2

PB6

I/O

FTf

I2C1_SCL, USART1_TX,

TIM16_CH1N,

TSC_G5_IO3

PB7

I/O

FTf

I2C1_SDA, USART1_RX,

TIM17_CH1N,

TSC_G5_IO4

BOOT0

Boot memory selection

PB8

I/O

FTf

(3)

I2C1_SCL, CEC,

TIM16_CH1, TSC_SYNC

PB9

I/O

FTf

I2C1_SDA, IR_OUT,

TIM17_CH1, EVENTOUT

VSS

Ground

VDD

Digital power supply

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 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 a 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.

On LQFP32 package, PB2 and PB8 should be treated as unconnected pins (even when they are not available on the

package, they are not forced to a defined level by hardware).

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

and internal pull-down on SWCLK pin are activated.

Table 13.

Pin definitions (continued)

Pin number

Pin name

(function after

reset)

Notes

Pin functions

Alternate functions

Additional functions

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