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BQ25703A: charging battery with 1A (fast mode)

Mohamed BOUHLEL
Prodigy 130 points
Part Number: BQ25703A


Hi,


I am trying to charge a battery with 3 cells that has a max value ~ 4.8V with a current of 1A.

When I visualize the power supply I see that all is well (the current injected to the bq25703a is ~ 1A) but when I consulted the registers: ChargerStatus (21 / 20h) and ADCIBAT (29 / 28h) I noticed that the current is set at 384 mA and the charger is in pre-charge.

How can I configure the BQ25703a to work in fast mode with a current of 1A?

Regards,

  • 0
    TI__Expert 5330 points
    Hi Mohamed,

    The default settings of BQ25703A as set via CELL_BATPRESZ are compatible with Li-Ion or similar cell chemistries, where fast charging would occur between approx 2.8 to 4.2 V per cell. For different chemistries, you should update these default values over I2C.

    You can set the fast-charge termination voltage in 0x15, fast-charge start voltage in register 0x3E, and the fast-charge current in register 0x14 with a uC at POR.

    If you have register 0x3E set below your battery voltage and register 0x15 above your battery voltage, you should see "fast charge" bit set in charge status register and see charging current at rate set in register 0x14. If not, please let me know your test conditions and, if possible, capture your register settings with Battery Management Studio and send them and I will recreate from this side.

    Regards,
    Steve