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BQ35100: BQ35100

NANDHINI S
Prodigy 60 points
Part Number: BQ35100

Hi sir, 

In our current design , we are using "BQ35100PW" battery monitor IC ,interface with STM32L5 controller using I2C . 

Currently we are checking the battery charge( LiSOCL2 primary battery cell used for power) in accumulator mode,

we set GE-High, opconfig---0x03, battery capacity---3600mAh, cell voltage-3.6V. As per understanding when battery is full, it should give 3600mAh in accumulator mode but we are getting the vale" 4076863488 uAh" , 

Please help us to solve the issue.

  • 0
    TI__Guru** 104905 points

    Hello,

    The register tracks both negative and positive charge, it sounds like you may have done some slight charging to cause the counter to roll-over. The accumulated capacity does not start at your design capacity, it starts at 0mAh and increases from there based on the passed charge.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 60 points

    Hi sir,

    we are using non rechargeable primary cell(LS1700) , In the SW, we sent NEW_BATTERY() command to BQ35100 and then read the accumulated register which is giving huge vale not zero and its decreasing gradually from "4076863488 uAh" 

    Thank you

  • 0 in reply to Wyatt Keller
    Prodigy 60 points

    Hisir,

    We are getting 0uAh current at accumulated mode, no change in current and charge, please let me know to solve the issue.

  • 0 in reply to NANDHINI S
    TI__Guru** 104905 points

    Hello,

    Please make sure there is no charge occurring when you send the new battery command, otherwise the accumulation may roll-over.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 60 points

    Hi ,

    Yes, there is no accumulated capacity and current occurring, getting only battery voltage 3.6V, current is 0. Please help me resolve this

  • 0 in reply to NANDHINI S
    TI__Guru** 104905 points

    Hello,

    The gauge may not report current but the accumulated capacity measurement is very sensitive and could roll-over from a small offset if you are enabling the counter without any current flowing. Please ensure the gauge is calibrated for offsets and turn on the accumulation when there is a discharge event.

    Sincerely,

    Wyatt Keller