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Original question:

[FAQ] BQ34Z100-G1: BQ34Z100-G1 FAQs

BQ34Z100-G1: Passive Counting of Coloumbs?

Bernhard Bauer
Prodigy 10 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34Z100, BQ35100

I would like to use the BQ34Z100-G1 in Accumulator mode and got a bit confused while reading the Datasheet. It says that the nominal current consumption is around 0.3uA. However, after using the GAUGE_Start() function it is using 130 uA.

My question is: Doesn't the Gauge have to be constantly running to accurately Measure the Coloumbs accurately? Especially if the consumed Current by the Load isn't constant? Or does the GAUGE_Start() function only enable the Output of the Counter to be sent via I2C? Are the Coloumbs still accurately counted after using GAUGE_Stop?

Thank you for your help!

  • 0
    TI__Genius 12215 points

        Bq34z100-G1 has 3 modes, Normal, Sleep and Full Sleep, any of these modes consumes higher current than you have mentioned above, I only noticed 0.3uA as the ADC input leakage current, this is not consumption current.

        There should also be no Accumulator mode for bq34z100, bq34z100 predicts the available capacity with a very sophisticated algorithm which requires the battery model data to be configured and optimized before being put into use.

        The gauge can report Remaining Capacity, Relative State Of Charge via I2C command, the accumulated passed charge is also counted, but cleared from time to time by the gauge for the purpose of capacity calculation, only use this information(PassedCharge, i.e., accumulated coloumbs) to calculate the available capacity by host is not possible

        The gauge consume 130uA or so current when it is in normal mode, when the charge or discharge current at mA level can be monitored, under this scenario, the 130uA consumption current for gauge itself can be ignored.

        In relax mode, where there is no load or charge current detected by the gauge, the gauge will transition to sleep mode or full sleep mode, the consumption current can be ever lower, for most of applications with charge or discharge current above 100mA, the error can be ignored. 

  • 0 in reply to Steven Yao
    Prodigy 10 points

    Thank you Steven,

    When reading your answer I realized i put the wrong part number. I was actually asking about the BQ35100. Thank you for your help. I guess I will have to make a new question.