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Does an I/O port need any external protection device if carrying telecommunication through it?

April 26, 2017carrying device external port Telecommunication

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Does an I/O port need any external protection device if carrying telecommunication through it?

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The input function of SPMC65 family MCU is enabled by the Schmidt Trigger, therefore, the port boasts strong anti-jamming ability. However, in order to prevent interference from powerful interference source such as static electricity, it’s better to make I/O in series with a resistor.