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Original question:

TPS25750: TPS25750 sometimes fails to load from EEPROM and stays in PTCH mode.

BQ25792: What prevents excessive battery discharge on the BQ25792

Paul Saffren
Prodigy 180 points
Part Number: BQ25792


Tool/software:

In our application we are using the BQ25792 along with a 3S2P battery.   Sometimes the battery can be discharged to a point where the measured voltage (by the BQ chip) is 2.0 volts.   Is there a mechanism within the BQ25792 that prevents the battery from discharging (and therefore killing power to the system) if it drops below a certain voltage?    In other words is there any sort of low voltage disconnect.  I have set VSYSMIN to 9.0 volts. 

Kind regards, 

Paul

  • +1
    TI__Guru**** 169756 points

    Hi Paul,

    No. The charger isn't designed to charge bare cells.   The battery pack should have a pack protector circuit that prevents battery from over discharge.  If the pack protector over discharge threshold is too low for your system, you might consider writing software that uses the  charger's ADC to monitor battery voltage and turn off the system when the battery voltage drops too low.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 180 points

    Thank you Jeff, that makes perfect sense.  

    Regards, 

    Paul