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HL1
Explorer II
January 31, 2025
Solved

STM32f411 crystal

  • January 31, 2025
  • 1 reply
  • 519 views

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.

    This topic has been closed for replies.
    Best answer by TDK

    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.

    TDK_0-1738295774157.png

     

    1 reply

    T
    TDKAnswer
    Super User
    January 31, 2025

    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.

    TDK_0-1738295774157.png

     

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