Transcription of AN2867 Application note - STMicroelectronics
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October 2021AN2867 Rev 151/591AN2867 Application noteOscillator design guide for STM8AF/AL/S, STM32 MCUs and MPUs IntroductionMany designers know oscillators based on Pierce-Gate topology (hereinafter referred to as Pierce oscillators ), but not all of them really understand how they operate, and only a few master their design. In practice, limited attention is paid to the oscillator design, until it is found that it does not operate properly (usually when the product where it is embedded is already being produced). A crystal not working as intended results in project delays if not overall oscillator must get the proper amount of attention during the design phase, well before moving to manufacturing, to avoid the nightmare scenario of products being returned from the Application note introduces the Pierce oscillator basics and provides guidelines for the oscillator design.
topology. This is because all the oscillators that require external passive components (external resonator, load capacitors, etc.) covered by this document are of the previously mentioned type and topology. The harmonic oscillator family can be divided into two main sub-families: negative-resistance oscillators positive-feedback oscillators.
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