Dear TI support,
I'm using the bq77910a as a stand alone battery protection circuit in an 4 cells battery pack. In this design, I'm using the series FETs circuit configuration with CHGST always pulled high and ZEDE's pull-down equal to 1k.
The part is programmed and seems to work fine.
When testing (discharging the pack) to provoke a UV fault, the part goes into UV fault and shuts down the FETs as expected.
The problem is when I start charging the battery pack after the UV condition. The CHG FET is off and so the charging current flows thru its body diode making the CHG FET hot.
The DSG FET is not fully open and there is also a voltage drop across it.
Could you please advise what is the procedure to recover the bq77910 from this condition?
I've already tried pulling down CHGST or even the other steps mentioned at http://e2e.ti.com/support/power_management/battery_management/w/design_notes/1450.bq77910-reset-how-can-i-recover-from-a-permanent-fail.aspx . None of them worked.
Cheers,
Gustavo