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BQ76920: Issue with cell-voltage measurement

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Part Number:BQ76920

I'm using bq76920 for 3 cell bms. for that i shorted vc2-vc3, vc3-vc4  pins. I'm using atmega-328 and Arduino ide for programming. 

cell 1 and cell2 are showing proper voltage readings. but when I measure voltage for vc3,vc4 it is showing 47mV . and cell 3 which is connected to vc5 is showing 4.6v instead of 4.18.

i tried this for different cells same error appears. 

also please provide any other suggestion which may be not related to this error but helpful. so it might help in further projects.


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