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BQ20Z90: BQ20Z90 charger MOS turn off when SOC = 99%

Part Number: BQ20Z90

Dear Team

we found the Charger MOSFET turn off when the SOC = 99%, so we would like to know

1. Does this normal?

2. what are the conditions when the charger MOS will turn off? 

3. is there some related register to setting the turn off threshold ?

Thanks for you help.

Jun Shen