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BQ76942: Paired with BQ24610 does not detect charger

Gian Gamper
Prodigy 40 points
Part Number: BQ76942
Other Parts Discussed in Thread: BQ24610,

Tool/software:

Hello Experts,

We have a BQ76942 as a monitor and a BQ24610 as a charger. However, the monitor chip does not recognize when a charger is connected to the BQ24610 to charge the cells. The reason for this is, as far as I could narrow it down, that the delta between the measured TOS stack voltage and the pack voltage is not reached. The BQ24610 delivers 25.2 volts (to charge 6 cells). However, the BQ Studio shows that the measured stack voltage is approximately the same as the stack voltage.

Status: Sleep mode active, DSG Fet on CHG Fet off

3240.DEVICE.gg.csv

  • 0
    Prodigy 40 points

    If sleep mode is deactivated, charging works without any problems. Charging also works if CHG is configured to On during sleep mode.
    Is there a significant disadvantage if CHG is activated during sleep mode (using FET:option), as both DSG FET and CHG FET are then active?

    Edit: Or would it be better to not allow sleep mode?


  • 0 in reply to Gian Gamper
    TI__Expert 4320 points

    Hello,

    If 25.2V is your PACK voltage, what is your TOS voltage?

    In order for the device to exit SLEEP MODE, PACK pin voltage needs to be higher than the top-of-stack voltage by more than Power:Sleep:Sleep Charger PACK-TOS Delta (in your settings is 2000mV) and the top-of-stack voltage is less than Power:Sleep:Sleep Charger Voltage Threshold (in your settings is 20000mV).

    Best regards,

    Thomas Rainey