What is the capacitance IO of HSE and LSE?

SOCQU · ‎2022-05-03

PatrickF · ‎2022-05-03

Hi @SOCQU ,

usually, we assume Cstray (IO+PCB) at about 4 to 5 pF for both HSE and LSE.

See also AN2867: Oscillator design guide for STM8AF/AL/S, STM32 MCUs and MPUs

Regards.

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Javier1 · ‎2022-05-03

What microprocessor are you using?

we dont need to firmware by ourselves, lets talk

PatrickF · ‎2022-05-03

Hi @SOCQU ,

usually, we assume Cstray (IO+PCB) at about 4 to 5 pF for both HSE and LSE.

See also AN2867: Oscillator design guide for STM8AF/AL/S, STM32 MCUs and MPUs

Regards.

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In order 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.

SOCQU · ‎2022-05-03

Hi,

Sorry I've forgot to write I am using STM32MP151!

Sebastien

PatrickF · ‎2022-05-03

My comment above is valid for all STM32MP15 flavors.

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SOCQU · ‎2022-05-03

thanks😀