BQ34Z100-G1: Learning cycle failure with PbA battery

Luke Ereaut

    75AH which is 75000mAh already exceeded maximum allowed value reported by gauge, the maximum capacity can be reported by gauge is 32767mAh, to be safe, you may have scale down the capacity by scaling down the current by a factor of 3 or 4.

    Say when you calibrate the current, you generate a current of 8A, then you enter 2 to the calibration box for current calibration, by doing this, the current are scaled down by a factor of 4, all current related value shall also scale down by 4. Like Design Capacity, Design Energy, Qmax, charging current, taper current, etc., 

Hey Steven,

I'm aware of the capacity constraints of the gauge and as my gg file suggests, I have scaled Design Capacity and Taper Current parameters by 4, and scaled the current by 4 during current calibration.

I have not changed Design Energy, Qmax Cell 0 or Charge Current parameters. Are these parameters relevant to the success of the learning cycle?

So I should manually set Qmax Cell 0 to the capacity of my battery prior to starting the learning cycle?

We have struggled with learning cycles too. We found that it takes a full charge, relax, discharge, and relax to get the learning cycle to advance to 05 from 04 and a second cycle to get from 05 to 06. The TI documentation and the -G1 part do not match.

Thanks Ken, I'll give that a try.

Is that discharge you refer to required to be C/5? Or is it just a C/20 discharge?

So I tried a discharge -> relax -> charge -> relax -> discharge -> relax cycle, and I still could not get qmax to update (and thus could not get Learned Status to move from 0x04 -> 0x05).

t10.log  178t10.gg.csv

That did the trick. I got the fuel gauge to progress the learned status from 0x04 -> 0x05 with the qmax update, and then from 0x05 -> 0x06 with the Ra table update. Thanks for the help Steven and Ken.