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SOCQU
SOCQU
Associate II
May 3, 2022
Solved

What is the capacitance IO of HSE and LSE?

  • May 3, 2022
  • 5 replies
  • 1503 views

What is the capacitance IO of HSE and LSE?

This topic has been closed for replies.
Best answer by PatrickF

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.

In order to give better visibility on the answered topics, please click on 'Select as Best' on the reply which solved your issue or answered your question. See also 'Best Answers'

5 replies

Javier1
Javier1
Principal
May 3, 2022

What microprocessor are you using?

hit me up in https://www.linkedin.com/in/javiermuñoz/
PatrickF
PatrickFBest answer
ST Employee
May 3, 2022

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.

In order to give better visibility on the answered topics, please click on 'Select as Best' on the reply which solved your issue or answered your question. See also 'Best Answers'

In order to give better visibility on the answered topics, please click on 'Best Answer' on the reply which solved your issue or answered your question.Tip of the day: Try Sidekick STM32 AI agent
SOCQU
SOCQUAuthor
Associate II
May 3, 2022

Hi,

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

Sebastien

PatrickF
PatrickF
ST Employee
May 3, 2022

My comment above is valid for all STM32MP15 flavors.

In order to give better visibility on the answered topics, please click on 'Best Answer' on the reply which solved your issue or answered your question.Tip of the day: Try Sidekick STM32 AI agent
SOCQU
SOCQUAuthor
Associate II
May 3, 2022

thanks:grinning_face:

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