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BQ76952: CC2 Current not zero when no current is flowing trough the sense resistor

Rayvano Keizer
Prodigy 70 points
Part Number: BQ76952

Hi,

My bq76952 measures the wrong current when I read from the CC2 current.

The CC2 current sometimes becomes zero but most of the time it gives values around 100mA (positive and negative). But it supposed to be 0 mA because there is no current flowing trough the sense resistor.

I tried to solve this with the calibration of the broadoffset but this make the measure worse.

  • 0
    TI__Guru* 81035 points

    Hi Rayvano,

    What is the value of your sense resistor? The LSB of the CC2measurement is 7.6uV and it is normal to see some small variation (like +/- 1 LSB). For a 1 mOhm sense resistor this would be +/- 7 mA. 

    Regards,

    Matt