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stm32 xtal oscillator need Rext #27

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cypacmori opened this issue Apr 14, 2021 · 0 comments

cypacmori commented Apr 14, 2021 •

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The XTAL oscillator in the MiniSTM32F4x1 schematic is considered to be above the (DL: Drive Level) of XTAL.
Please refer to ST Application note AN2867 and add (RExt: external resistor to limit the inverter out).
https://www.st.com/resource/en/application_note/cd00221665-oscillator-design-guide-for-stm8afals-stm32-mcus-and-mpus-stmicroelectronics.pdf
Please refer to chapter 3.
SMD XTAL DL of 100-150µW is recommended, 300-400µW max. (2016 size)

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