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BQ25120A: specification question

Driscoll Tsai
Expert 1590 points
Part Number: BQ25120A

Hi Sir,

1.Data sheet P19 table2, why the remaining capacity range is so wide? (65%~35% remaining capacity to 90%~92% VBMON=4.2V)
Could our MCU process to enhance the capacity accuracy when monitor battery VBMON?

2.Per question1, could we use the specific 0.2C discharge table (VBAT to Capacity) to do the estimation? either from our battery supplier or the similar value measured by ourselves?

thanks~

best regards,

Driscoll

  • 0
    TI__Genius 12485 points

    Driscoll,

    You would have to come up with a accurate DoD (depth of discharge) vs voltage plot for any given battery. 

    The one on the example was a guideline using a typical profile supplied to us. Battery Gauge folks might have a better estimation method. 

    If you are using an MCU and have access to an ADC, you might be able to make better measurements. You might also try using a gauge type device. 

    regards,

    gautham