MCU Clock Design: External Clock & Crystal Oscillator

1. First, identify the clock pins.MCU Clock Design: External Clock & Crystal OscillatorProvides a 32.768kHz clock.How is 32.768kHz derived? Refer to the chip manual. Typically, a nominal value is used.High-speed clock:MCU Clock Design: External Clock & Crystal OscillatorLow-speed clock:MCU Clock Design: External Clock & Crystal OscillatorThe low-speed clock is generally used for the RTC module. Its main function is timing.32.768kHzis exactly 2 to the power of 15, making it easy to divide down to whole seconds.1 second corresponds to 1Hz.Internal clock: lower accuracy.MCU Clock Design: External Clock & Crystal OscillatorCrystal oscillator accuracy, if displayed as ±20ppm, means an accuracy of 20 parts per million.MCU Clock Design: External Clock & Crystal OscillatorThe crystal oscillator also needs to be paired with matching capacitors; the specific capacitance required will be indicated in the crystal oscillator’s datasheet.MCU Clock Design: External Clock & Crystal OscillatorMCU Clock Design: External Clock & Crystal OscillatorMCU Clock Design: External Clock & Crystal OscillatorMCU Clock Design: External Clock & Crystal OscillatorStray capacitance is unquantifiable and can only be roughly estimated: 3~5pF.CL1=CL2Assuming the datasheet specifies CL=20pF,take CS=5pF.Then calculateCL1=CL2=30pF, which means a load capacitance close to 30pF should be used for this crystal oscillator.MCU Clock Design: External Clock & Crystal OscillatorMCU Clock Design: External Clock & Crystal OscillatorThe feedback resistor can be reserved in position but not soldered.

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