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请问这图中的BAT54S起到什么作用,请高手细说

ESD protection and clamp of D0 signal at +/- 30mA input current BAT54S clamps to +3.8V/-0.5V at +/- 100mA input current BAT54S clamps to +4.1V/-0.8V at 5V 40mA input clamps to below 4.1V (22Ohm current at 0.9V 41mA) ESD protect...

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