Hi,
We are currently trying to test the protections on the BQ78350 used with BQ76940.
We are trying to enable and disable the CHG and DSG FETs but we can’t get them to open or close.
We are using our own board, but we previously tested and developed our interface with the BQ76940 EVM board.
We wanted to test the protections prior to installing the batteries, therefore we have an external power supply plugged on the PACK terminals to provide the power necessary for the board.
We have provided screenshots of the registers using BQ studio.
We have even tried to use the FET override mode (FET_EN = 0), to override control of the FETs. When we write to manufacturer address 0x001F or 0X0020, we see CHG_TEST and DSG_TEST bits set in ManufacturingStatus(), however, CHG and DSG bits are never set in OperationStatus().
The only odd thing that we see is that the INIT bit is set in BatteryStatus() and it never changes state. The BQ78350 TRM never mentions what conditions must occur to leave the INIT state.
Please advise.
Thank you
