cancel
Showing results for 
Search instead for 
Did you mean: 

HSE Oscillator for STM32L01 series MCU

shane mattner
Senior

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?

1 ACCEPTED SOLUTION

Accepted Solutions
Foued_KH
ST Employee

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.

View solution in original post

4 REPLIES 4
Issamos
Lead II

Hello @shane mattner 

This post may answer your question.

Best regards.

II

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.

Hello @Foued_KH 

Thanks :smiling_face_with_smiling_eyes:

 

Foued_KH
ST Employee

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.