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How can I reset BQ27750 without disconnet/connect battery cell?

Danil Koshelev
Intellectual 320 points
Other Parts Discussed in Thread: BQSTUDIO

Hello, BQ27750EVM with connected battery and programed flash was tested and work OK, but after some time "unoccupied" when I try to conneckt again - the I2C communication is not start and  FET is not control, looks like the microcontroller is frozen becouse voltage was OK (more than under voltage therhold).
I connected charger, hope activeted, but it was not help. Also charge current is not start. I recover BQ27750 only after disconnet/connect battery cell. My question: How can I reset BQ27750 without disconnet/connect battery cell? Is there WDT or somethig like this?
Thank you. Best regards, Danil

  • 0
    TI__Genius 10370 points

    Danil,

    The ways to reset the gauge are power on  reset (cell disconnect), Reset command via I2C, or watchdog timeout. There is no way to force a watchdog because it is handled on the hardware level inside the IC. To confirm here is the current state.

    1) You used bqStudio to program the device via the "Programming" plugin

    2) FETs are currently open thus not allowing current to flow

    Please try and go to the advanced Comm screen and read address 0x0D at both I2C addresses 0xAA and 0x16.

    If the device responds on 0x16 and not 0xAA then it is currently in ROM mode. for that please try and reprogram the device

    Thanks,

    Eric Vos