STM32F103: HSE Crystal Capacitors

[Michael_CH]

Hello

Which are the correct Capacitors to use for HSE on STM32F103 with the following Crystal?

Frequency: 8 MHz

Load capacitance CL: 20 pF

Thank you in advance for a quick hint.

Regards

Michael

[Peter BENSCH]

Welcome @Michael_CH, to the community!

You have provided too little information for a qualified answer. Essentially, however, you will find everything in detail in AN2867.

Hope that helps?

Regards
/Peter

[Michael_CH]

I am not an engineer, but just a hobbyist trying to make my first schematic and a PCB.

I was looking the AN, but honestly that was too complex for me.

Therefore i hope some more experienced people can tell me the correct value for the 2 capacitors there. 

Which information is missing?

Thank you. 

[Peter BENSCH]

Firstly, the data sheet of the crystal used is important, from which you can see the key values: C0, CL and ESR.

Furthermore, the AN2867 mentioned above also contains important notes on layout from section 7 onwards, which you should read and try to understand.

[AScha.3]

So just look at the "blue pill" circuit, as an example:

or at circuit of STM nucleo boards:

So choosing 2x 20 pF should be ok; (out of the typical range 12...20 pF)

[Michael_CH]

Crystal datasheet:

https://datasheet.lcsc.com/szlcsc/1903061615_Yangxing-Tech-X50328MSB2GI_C115962.pdf

CL i already provided: 20 pF

C0: 3 pF max.

ESR: 80Ω max.

Hope that help you to help me. :)

[Andrew Neil]

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@Michael_CH wrote:

I am not an engineer, but just a hobbyist trying to make my first schematic and a PCB.

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But designing an electronic is an engineering exercise!