STM32f411 crystal

HL1 · ‎2025-01-30

Hi,

I am new with stm32F411 mcu, and i have a question. if i want to use RTC features, do i need to add an external 32.768kHz xtal ?

Thanks.

TDK · ‎2025-01-30

No technically. You can use the internal LSI or the divided down HSE clock. However, the LSI clock is not very accurate and the HSE clock uses a lot of power.

But typically, an LSE crystal is used as it allows the chip to go into a very low power state while still running the RTC.

If you feel a post has answered your question, please click "Accept as Solution".

View solution in original post

TDK · ‎2025-01-30

No technically. You can use the internal LSI or the divided down HSE clock. However, the LSI clock is not very accurate and the HSE clock uses a lot of power.

But typically, an LSE crystal is used as it allows the chip to go into a very low power state while still running the RTC.

If you feel a post has answered your question, please click "Accept as Solution".