Other Parts Discussed in Thread: BQSTUDIO
Hello,
This is a semi-continuation of a previous post: https://e2e.ti.com/support/power-management/f/196/t/852468
I have been running learning cycles on my 17x12 V, 8Ah battery pack. At first I was getting values of 0 or 1, which I was told is okay since all the values are relative, and I should only be concerned about the change in Rcell rather than the value itself. I have automated a cycle which charges/discharges the battery pack and takes Rcell measurements every 2 or so discharge/charge cycles. I noticed that the learning cycles were returning a value of 6553 consistently (3 or 4 times in a row). I played around with data flash settings and noticed that when I set the Rcell High Temp Coefficient to 0 (it was previously at 267), the learning cycles returned values of 1 or 0 again. BUT occasionally (even with the temp coefficient at 0) the learning cycle will return a value of 4074 or 6553.
Voltage and Current gauging on the chip is very accurate, which is all that should matter according to all the technical documentation that I have read. So what is the problem? Why are the values either close to 0, or in the 1000s? The end of service determination is the whole reason we got this chip, so if it can't even do that reliably, it's useless.
Thanks,
Colin