Hi,
I just bought the BQ34Z100EVM to monitor my 3.2V 10Ah LiFePO4 battery. I set the chem to ID 0415 (It is not the same manufacturer as the battery I have but same Ah), the Qmax Cell to 10000mAh.
I am having issues with this board.
1) If the battery goes below 2.8V the flags SOC1, SOCF become red and remaining capacity becomes 0 and full charge capacity becomes some kind of arbitrary number. With these flags on and the battery is being charged the SOC1 and SOCF flags stay on and remaining cap and full charge stay the same. They won't read properly anymore until I unplug the battery, do a 0041 (reset) then plug it back in. Afterwards the numbers are correct.
2) I have a load between 160mA to 700mA on the battery, the average current is correct remaining cap and full charge cap are correct at the beginning. After some time, something happens and I have 2 different scenarios.
1) Full charge is correct, remaining cap is a very low number and incorrect. Looking at the log there was some error then remaining cap value became incorrect
2) Full charge becomes some arbitrary number and remaining cap becomes 0
3) if I do a 0041 (reset) function while the fuel gauge is monitoring the battery, I get incorrect remaining cap and full charge cap values.
4) Passed Charge seems to be resetting itself as well. What is this value supposed to represent?
Attached is the excel file, please look at row 3415.
(Please visit the site to view this file)
I also attached two pictures of the program reporting correct values for remaining cap and full charge and another picture when it goes bad.
Below is the configuration section and the gas gauge section.
Thanks,
Cris