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BQ25601: BQ25601 charge current in correct

Star Xu
Genius 9645 points
Part Number: BQ25601


Hi

The customer design with BQ25601, when the voltage charging to about 4V, the charging current is maintained at 60mA.

But they set the terminate current is 180mA, and there should be no charging current lower than 180mA. In addition, after re-plugging the adapter and battery, a charging current of 180mA appeared, and the battery voltage reached 4.2V.

Except for the registers listed below, the other registers are not modified, and they are all default values.

REG(XX) means to read the value of the xx register, value_xx means to write the value into the corresponding xx register

REG 0x02
value_02 = (REG(0x02) & 0xC0) | 0x11

REG 0x05
value_05 = REG(0x05) & 0xCF

REG 0x06
value_06 = (REG(0x06) & 0xF0) | 0x03

Attached the schematic
 7127.bq25601.pdf
Waiting for your reply.
Thanks
Star
  • 0
    TI__Genius 10240 points

    Hi Star,

    The team is currently out of the office for the Easter Holidays. We will get back to you on 04/11 after we return to the office. Thanks for your patience.

    Regards,

    Eric

  • 0 in reply to ezhao
    TI__Genius 9645 points

    Hi Eric

    Any update?

    Thanks

    Star

  • 0 in reply to Star Xu
    TI__Guru 59461 points

    Star,

    Could you please provide 1 & 2 for the cases 1), 2) & 3) you mentioned respectively? 1) the voltage charging to about 4V, the charging current is maintained at 60mA. 2) after they set the terminate current to 180mA,  there is charging current lower than 180mA 3) after re-plugging the adapter and battery, a charging current of 180mA appeared, and the battery voltage reached 4.2V.

    1. The charger operating conditions such as VBUS (voltage at VBUS pin), IVBUS, VBAT (voltage at BAT pin), IBAT, VSYS, ISYS 
    2. All the register readings

    Thanks,

    Ning.