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BQ27510-G3 : learning cycle fails when discharging. Ra tables not updated

Foort Cove
Prodigy 10 points
Other Parts Discussed in Thread: BQ27510-G3, BQEVSW

I am trying to create a golden image for the BQ27510-G3 gas gauge. I have determined the correct chemistry  type for my battery and use this (1116) when running bqeasy in the bqEVSW application. 

I have tried the learning cycle 3 times already, but what I see is that the RA tables are not (never) updated during the discharge cycle. In other words, the update status is never set to 0x02.

The first cycle, charging until full, is executed without errors. I see that the update status is eventually changing to 0x01 , and I see that Qmax for cell 0 is set at 506 mAh.

My battery has a capacity of +/- 550 mAh. The discharge current starts at -100[mA] and eventually ends with a value of  +/- -70 [mA]

Could you please advise me?

  • 0
    TI__Guru* 76230 points

    hi there,

    The learning cycle requires you to use a constant discharge current  for Resistance to be updated. I would recommend using c/7, so for your 550mAH battery, that will be ~80mA of constant discharge current.

    update status changing to 01 means qmax is updating, but it updating to 506mAh when your battery is 550mAH doesn't appear correct.  What is the min and max voltage of your battery, is it 3V to 4.2V? Ensure you are charging and discharging to these values i.e whatever is stated in the manufactures data sheet otherwise your qmax will not learn correctly. Also, what value did you set design capacity to? This should be the value stated as the nominal capacity in the data sheet of the cell.

    thanks

    Onyx