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BQ25703A: Not charging in pre-charge mode

Tze An Chua
Prodigy 10 points
Part Number: BQ25703A

Hi,

When the charger is in precharge mode, the charging current register (02H) is set to 128mA, but the charging current reading (28H) is always 0.

The charging voltage is set to 2.88V for 1S cell.

What could be wrong here?

  • 0
    TI__Mastermind 33445 points

    At low pre-charge current, the signal is low. Due to limited ADC resolution, you may have a wide tolerance on the ADC current readback, especially at low current level. This does not mean the the real charge current is zero. I would suggest you measuring the current using a current meter.