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BQ25890: TSPCT becomes 0 when the SOC is about 2%

FrankXu
Genius 3500 points
Part Number: BQ25890

Hi,

      I use BQ25890 and use a 103AT NTC thermistor on the battery pack.

      I find that, the TSPCT will becomes 0 when the SOC is about 2%, as shown below.

      You can see that after the SOC drop to 2% for a while, the TempBatt jump to 84.8C. I looked at the TSPCT, it is 0 at that time.

      At first, I think maybe the Voltage drops to Vsysmin(3.5V) and the BQ25890 turns into VSYSMIN mode, maybe at that mode, the TSPCT can not work normally.

      But I find the VSYS_STAT is still 0, which means the BQ25890 is still at normal regulation mode.

      So, what happens?

      Thank you.

Frank

  • 0
    TI__Guru 57341 points

    Hi,

    In battery only mode, the ADC is only functional if the battery voltage is higher than the MINSYS register setting (REG03 bits1:3). If your change the MINSYS voltage to its lowest setting = 3.0V, the ADC functions down to VBAT=3.0V.

    Thanks,

    Ning.