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CCS/UCD3138128: Internal structure of I2C

Part Number: UCD3138128

Tool/software: Code Composer Studio

Hi there,

I want to know that in the picture below, is it labeled as a diode or zener ?

Another question is that to add a clamp diode into the circuit in below , is it necessary to do this ?  We have an issue when we do the hot-swap , sometimes it would glitch on SDA/SCL.