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AD8218 wrong output value

Question asked by dlokt on Dec 5, 2014
Latest reply on Dec 11, 2014 by iamPhil

Hello,

 

I'm using AD8218 as battery current monitor. I'd made reference design but has a wrong output value. R14 is shunt precision resistor - 0.01 Ohm. AKBI and AKBO are connected to charger and 12V battery. Output pin 5 everytime equal 5.32V at any case. R14 voltage drop is from 0 till 60mV - voltage on output didn't changes.

 

As I understood from datasheet, internal LDO clamps output voltage with value 5.2V. It looks like AD8218 didn't seen +5v power supply and feed from IN+ pin.

AD8218-shunt.jpg

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