Transcription of AN2867 Application note - STMicroelectronics
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AN2867 Application note - STMicroelectronics
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. It also shows how to determine the different external components, and provides guidelines for correct PCB design and for selecting suitable crystals and external speed-up the Application development the recommended crystals (HSE and LSE) for the products listed in Table 1 are detailed in Section 5: Recommended resonators for STM32 MCUs/MPUs and Section 6: Recommended crystals for STM8AF/AL/S microcontrollers.
2C 0 C L + +----- = According to this equation, the oscillation frequency of the crystal can be tuned by varying the load capacitance C. L. This is why, in their datasheets, crystal manufacturers indicate the exact C. L . required to make the crystal oscillate at the nominal frequency. Table . 2
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