AnsweredAssumed Answered

ADuM1401: VDD1 is on, VDD2 is off

Question asked by sofy Employee on Dec 25, 2013
Latest reply on Jan 8, 2014 by sofy

Hello,

About ADuM1401 usage around VDD1 and VDD2.

One customer's application has two modes, normal and backup mode.

In normal mode, ADuM1401 both VDD1 and VDD2 are supplied 5V and 3V. There are no problem.

But when application go to backup mode, only VDD1 power supplied but VDD2 power off.

Is this situation(only VDD1 powered on) not good for ADuM1401?

 

Even VDD2 powered off and Ve1 is low, there are 200mV on VDD2 side pin.

Why voltage come up VDD2 side pins without VDD2 powered?

 

Thank you for your help as always.

Best regards,

Sofy

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