STM32WB55 custom board and 32Khz crystal

[kcire L.]

Hi,

I'm creating a custom PCB for the STM32WB55 with BLE functionality and was wondering if in order to use BLE, do I need to include a 32Khz Oscillator on pins PC14 and PC15? I am assuming I do, but did not see anything definitive in the datasheet.

Thanks for any help.

[Imen.D]

Hello @kcire L.​ 

 For information about oscillator compatibility with STM32WB series, please refer to the AN5042 "Application note Precise HSE frequency and startup time tuning for STM32 wireless MCUs".

Imen