STM32WB15CC datasheet(52/127 Pages) STMICROELECTRONICS

52 / 127 page

Pinouts and pin description

STM32WB15CC

52/127

DS13258 Rev 4

-33

VDD

-32

VDD

1. PC14 and PC15 are supplied through the power switch. As this switch only sinks a limited current (3 mA), the use of PC14

and PC15 GPIOs in output mode is limited:



- the speed must not exceed 2 MHz with a maximum load of 30 pF



- these GPIOs must not be used as current sources (e.g. to drive a LED).



After a Backup domain power-up PC14 and PC15 operate as GPIOs. Their function depends on the content of the RTC

registers not reset by the system reset. For details on how to manage these GPIOs, refer to the Backup domain and RTC

2. The clock on LSCO is available in Run and Stop modes, and on PA2 in Standby and Shutdown modes.

3. RF pin, use the nominal PCB layout.

4. 32 MHz oscillator pins, use the nominal PCB layout according to reference design (see AN5165 available on www.st.com).

5. Reserved for production, must be kept unconnected.

6. High frequency (above 32 KHz) may impact RF performance. Set output speed GPIOB_OSPEEDRy[1:0] to 00 (y = 0 and

1) during RF operation.

7. After reset, this pin is configured as JTAG/SW debug alternate function, and the internal pull-up on PA15, PA13 and PB4

pins and the internal pull-down on PA14 pin are activated.

8. On WLCSP49 package only serial-wire debug port is available (PA13 and PA14).

PB5 pin is configured as input with pull up active under reset if NRST pin is active (external or internal reset).

Table 15. STM32WB15CC pin definitions (continued)

Alternate functions

Additional

functions

Number

Name

(function

after reset)

STM32WB15CC 데이터시트(PDF) 52 Page - STMicroelectronics