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Marcel Blindu
Marcel Blindu
Associate III
Jan 14, 2019 4:11 PM UTC
Solved

Oscillator calculation STM32

I want to use a STM32F103, STM32L431, 451 and 471 microcontroller, but i don´t know if the crystal that i selected (ABS07-120-32.768kHz-T and ABMM2-8.000MHZ-E2-T) is valid for this microcontroller.

And another question is how to calcule the load capacitance that a need to put in parralel with crystals.

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    Tesla DeLorean
    Tesla DeLoreanBest answer
    Guru
    Jan 14, 2019 4:23 PM UTC

    Read the app note? https://www.st.com/content/ccc/resource/technical/document/application_note/c6/eb/5e/11/e3/69/43/eb/CD00221665.pdf/files/CD00221665.pdf/jcr:content/translations/en.CD00221665.pdf

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    2 replies

    Tesla DeLorean
    Tesla DeLoreanBest answer
    Guru
    Jan 14, 2019 4:23 PM UTC

    Read the app note? https://www.st.com/content/ccc/resource/technical/document/application_note/c6/eb/5e/11/e3/69/43/eb/CD00221665.pdf/files/CD00221665.pdf/jcr:content/translations/en.CD00221665.pdf

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    Marcel Blindu
    Marcel BlinduAuthor
    Associate III
    Jan 15, 2019 9:14 AM UTC

    Thanks but which values can I suppose for Cin, Cout and Board Strays for STM32F103 and STM32L4 for HSE and LSE using the ecuation 1 in the following datasheet of the abracon "https://abracon.com/uploads/resources/PierceOscillator_Fundamentals.pdf"

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