STM32F031X4 datasheet(30/106 Pages) STMICROELECTRONICS

30 / 106 page

Pinouts and pin description

STM32F031x4 STM32F031x6

30/106

DocID025743 Rev 4

PB5

I/O

SPI1_MOSI,

I2S1_SD,

I2C1_SMBA,

TIM16_BKIN,

TIM3_CH2

PB6

I/O

FTf

I2C1_SCL,

USART1_TX,

TIM16_CH1N

PB7

I/O

FTf

I2C1_SDA,

USART1_RX,

TIM17_CH1N

BOOT0

Boot memory selection

PB8

I/O

FTf

(4)

I2C1_SCL,

TIM16_CH1

PB9

I/O

FTf

I2C1_SDA,

IR_OUT,

TIM17_CH1,

EVENTOUT

VSS

Ground

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 system reset. For details on how to manage these GPIOs, refer to the RTC

domain and RTC register descriptions in the reference manual.

3. VSSA pin is not in package pinout. VSSA pad of the die is connected to VSS pin.

4. On the 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).

5. 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.

6. On the WLCSP25 package, PB3, PB4 and PA15 must be set to defined levels by software, as their corresponding pads on

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

Table 11. Pin definitions (continued)

Pin number

Pin name

(function upon

reset)

Notes

Pin functions

Alternate functions

Additional

functions

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