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BQ78PL116: RESET in Safety history

Part Number: BQ78PL116
Other Parts Discussed in Thread: BQWIZARD

Hi,

We are using BQ78PL116 in 4S6P LiFEPO4 battery pack. Recently we got customer issue saying that battery pack is not able to charge/discharge.

When we checked the safety history, event name called "Reset" has been seen. What would cause to set this safety event ?

We tried to discharge the battery pack to see whether we are able to replicate the issue. We have been able to see the safety event RESET along with CUV , Precharge condition.

After removing the load, the cell voltage goes up and BQ is able to communicate with BQwizard. Surprisingly all CFET, DFET and PFETs are turned ON which is not expected as few cell voltages are less than CUV recovery threshold of 2.8V.

Although it's NRND part, we require your support on this issue. Looking forward to resolve this issue as soon as possible

Regards,

Vasanth