BQ2084 V143 DSG FET be latched low status

Any safety related protection will trigger DSG FET to be turned off.

Please refer to the data sheet, Li-ion protection and Permanent Failure sections.

Thanks a lot!

But what conditions would cause DSG  FET be always latched off status?

I met one stronger symptom that DSG FET was always off status and voltage is to full status.

Example: 

1. Voltage reached CVUV, then DSG FET be turned off.

             Released condition that device detects did charging action;

      2.    Short current;

               When the short condition be released , Device would recover to normal automatically.

Any of the permanent failure conditions will blow the fuse and keep both CHG/DSG FETs in the off state.

Hi Jackie:

Only DSG FET is off status, CHG FET is on status;not PF raised;

This battery pack be inserted into the host system, and charged to full, then put into -20 for 2hours.

Turned on the host system, observed DSG FET be latched to off status.

Do you have any suggestion ?

Any safety flags got set? Can you post a screen shot of the SBS screen?

It looks to me like the gauge may have had a CVUV at some point but has since recovered. The curious thing here is that your capacity does not match up with your cell voltages at all.