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BQ25713: Charger can’t charge continuously

reza nouriyan
Prodigy 100 points
Part Number: BQ25713
Hi dear I am using BQ25713 in order to charge 4 cell battery with 5v USB power banks All default values of registers are fine to me. I just want to charge cells with 1.2 ampere and be able to charge again when adapter is removed and plugged again. I just set my desired current to 0x02 and 0x03 and charger starts to charge but after less than a second charger stops charging. Here are my questions: 1) i was not able to do previously described procedure with 5v USB power bank and i did it with power supply. Why is that ? As i understood charger had to set all offsets and initializes with respect to input voltage without help of host. So why it didn’t charge cells with 5v? 2) did i something wrong to charge with 1.2A ? And why charger stops charging fast
  • 0
    Prodigy 100 points
    When i put charge current at almost 100mA it works but for greater currents charger stops charging in less than a second
  • 0
    Prodigy 100 points
    Please take into account that i didn’t change any register after POR and just updated charge current register. I assumed that charger will update input voltage and current limit registers automatically when an adapter plugged vmax charge and vmin sys default values are ok to me. Is there a way to disable DPM mode that decrease charge current to give priority to system load. Because i think problem is related to this issue. But on the other hand i am testing IC at no load so there is no load to draw current from VSYS. I am completely confused Please help
  • 0 in reply to reza nouriyan
    TI__Mastermind 25800 points

    Hey Reza,

    We need a register dump the moment before and the moment after the charger stops charging.

    A waveform is also necessary, showing VBUS, IBUS, SW2, and VSRN. 

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    Prodigy 100 points

    Dear Joel

    hi, thanks for reply

    unfortunately i am not able to check waveform and share with you but i have found out that when i write some values to charge current register BQ doesn't charge batteries but for some other values it starts charging but also in this way charging current is not same as i wrote it.

    which registers do you want to know before and after. just let me know

    thanks again 

    best regards

  • 0 in reply to reza nouriyan
    TI__Mastermind 25800 points

    Hey reza, 

    I would like to see all charger registers before an after.

    Regards,

    Joel H

  • 0
    Prodigy 10 points

    Hi!

    Check the watchdog timer in ChargeOption0 register (I2C address = 01/00h) - WDTMR_ADJ.

    The default setting stops charging after 175s without repeatedly sending the charge current.
    You can disable the watchdog by setting 00 for bits 6-5 - then the charging will not stop when you don't send the current register.

    Best,
    P