Other Parts Discussed in Thread: BQ40Z50, GPCCHEM
Hello,
I use the BQ40Z50 in an application where the charge current is quite high (800mA) and the discharge current is low (10-30mA usually, with some short peaks in 100mA range).
Even after many golden images I have some drops in capacity at the end of discharge, as example the one below that drop from 10% to 0 :
I can't share publicly all the parameters of my application, but here is what I set :
3300mVpc should be 0% of RSoC, I set the options to be at 0% as soon as one cell reach this value. I do this to be sure to report 0% before reaching CUV at 3000mVpc
The problem is we are not going down smoothly....
One thing I have seen is the FCC change quite a bit between Full charged state at 757mAh to 691mAh at the end (this was reported at 13%, but I don't have a frequent report of it)
So if we have 66mAh change between charged and discharged (almost 10%) I think this is not great to have a precise gauging.
I already use the 3mR sense resistor, which is the max recommended. Can this be problematic at low current ?
I share the IT configuration part, if you need another information let me know. If you need the whole file, please tell me how to send it privately.
Thanks in advance for help !