HSE Oscillator for STM32L01 series MCU

shane mattner · ‎2023-09-05

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?

Foued_KH · ‎2023-09-06

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

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Issamos · ‎2023-09-05

Hello @shane mattner

This post may answer your question.

Best regards.

II

Foued_KH · ‎2023-09-06

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 · ‎2023-09-06

Hello @Foued_KH

Thanks 😊

Foued_KH · ‎2023-09-06

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.