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shane mattner
shane mattner
Senior
September 6, 2023
Solved

HSE Oscillator for STM32L01 series MCU

  • September 6, 2023
  • 2 replies
  • 1540 views

I'd like to try using the STM32L011E4Y6TR in a new design.  However, the HSE input has only one pin (RCC_CK_IN) and I'm not sure how to use it with a standard 4 pin crystal that typically connects to 2 mcu pins.  Can someone point me toward a reference design oscillator circuit for the STM32L0 series?

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Best answer by Foued_KH

Hello @shane mattner , 

You can't connect a crystal/Ceramic Resonator as HSE for this package ( pins limitation)
The only way to use HSE is to inject a signal through the PA0.
Or you can connect a crystal/Ceramic Resonator  as LSE through PC14 and PC15.

Hope it helps!

Foued

2 replies

Issamos
Issamos
Lead III
September 6, 2023

Hello @shane mattner 

This post may answer your question.

Best regards.

II

    Foued_KH
    Foued_KH
    ST Employee
    September 6, 2023

    Hi @Issamos , 

    The STM32L011E4Y6TR package is WLCSP25 not the LQFP32 

    Foued

    To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
      Issamos
      Issamos
      Lead III
      September 6, 2023

      Hello @Foued_KH 

      Thanks :smiling_face_with_smiling_eyes:

       

      Foued_KH
      Foued_KHBest answer
      ST Employee
      September 6, 2023

      Hello @shane mattner , 

      You can't connect a crystal/Ceramic Resonator as HSE for this package ( pins limitation)
      The only way to use HSE is to inject a signal through the PA0.
      Or you can connect a crystal/Ceramic Resonator  as LSE through PC14 and PC15.

      Hope it helps!

      Foued

      To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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