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UCD9090A: for the accuracy of UCD9090A

Part Number: UCD9090A

Hi team,

My customer is using the UCD9090A now. When they use the channel 1 for 3.3v, with divide 0.5. The voltage in the mon is 1.618v and the GUI is 3.137v. I also let them change it to divide 1, the gui is 1.518v, why the accuracy is so bad here?  We try another rail without divider, the voltage is very accurate. Thanks.