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BQ28Z610: BQ28Z610 Will the AOLD current be recorded in the maximum load current (Max Load Current)?

Star Xu
Genius 9645 points
Part Number: BQ28Z610

Hi 

I have a query need your help.

AOLD is set to 0XF4, RSNS=0, Rsense is designed to be 1mΩ (CC Gain and Capacity Gain are both 1.415mOhm after calibration).

Overload current = –27.76 mV / 1.415 mΩ = 19.6A, the Safety Status AOLD will only be triggered when Current() > 19.6A.

But when the Safety Status AOLD is triggered, it is found that the Max Load Current is only 14A, 15A.

Does it normal?

What is different with Max Dsg Current and Max Load Current? AOLD current will update in Max Dsg Current or Max Load Current?

Waiting for your reply.

Thanks

Star

 

  • 0
    TI__Guru 51456 points

    >But when the Safety Status AOLD is triggered, it is found that the Max Load Current is only 14A, 15A.
    >Does it normal?

    This depends on the accuracy of the sense resistor and any noise and how you measure the current. The gauge uses a comparator with programmable voltage thresholds. If you read the current from the gauge, make sure it's not an averaged current over several seconds (which is the default current measurement from the gauge). Also the gauge uses a 250ms integration period for coulomb counting whereas the AOLD circuit is a HW comparator without averaging.

    About MaxLoadCurrent: From the TRM: "This read-only function returns a signed integer value in units of mA, of maximum load conditions. The MaxLoadCurrent() is an adaptive measurement which is initially reported as the maximum load current programmed in initial Max Load Current register. If the measured current is ever greater than the initial Max Load Current then the MaxLoadCurrent() updates to the new current. MaxLoadCurrent() is reduced to the average of the previous value and initial Max Load Current whenever the battery is charged to full after a previous discharge to an SOC of less than 50%. This will prevent the reported value from maintaining an unusually high value"

    MaxDsgCurrent in Lifetimes is the maximum current the gauge ever measured.