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UCD3138064: Is AD00 high impedance

Part Number: UCD3138064

Hi there,

My customer have a application on power supply.The picture shows circuit  and test waveform as below.

Device A is power delivery and device B is no power delivery , we measure the node T2 , it has 1v , but I think it should be 0v.

So is AD00 not high impedance? if not , what is it ? Can you show the detail on this ? thanks a lot.