Methods of preventing electromagnetic interference in single chip microcomputer-EEWORLD

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1. Pull up what needs to be pulled up, pull down what needs to be pulled down, add capacitors where necessary. In short, do not leave any pin of the MCU just lying there - and do not count on the pull-up resistor inside the MCU.

2. If it is not necessary, do not use an external high-frequency crystal oscillator. Try to use the method of [internal RC oscillator to maintain operation + external 32768Hz crystal oscillator timing + software modification of oscillator fine-tuning register control rate]. If possible, even the 32768Hz crystal should be replaced with an active oscillator of similar rate.

3. Use a four-layer board, with a shielding layer underneath and a shielding cover on top.

4. In terms of power supply, the power supply to the MCU must use linear voltage regulator, and do not use popular products such as 7805 or 1117. At the same time, the filter capacitor, decoupling capacitor and filter inductor must be used. At the same time, if the power consumption requirement is not strict, use the voltage regulator diode to power the MCU as much as possible.

5. If possible, try not to install industrial control devices on the MCU board. At the same time, the MCU board should use differential communication as much as possible (the latter half may require CPLD or several high-speed 422/485 interfaces to assist)

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