HSE Oscillator for STM32L01 series MCU

[shane mattner]

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?

[Issamos]

Hello @shane mattner 

This post may answer your question.

Best regards.

II

[Foued_KH]

Hi @Issamos , 

The STM32L011E4Y6TR package is WLCSP25 not the LQFP32 

Foued

[Issamos]

Hello @Foued_KH 

Thanks :smiling_face_with_smiling_eyes:

[Foued_KH · Accepted solution]

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