Other Parts Discussed in Thread: BQSTUDIO, BQ34Z100EVM, GPCRA0
Hi,
As the title suggested, we are having trouble completing the learning cycle for NiMH battery for our project, specifically, we enabled IT and Learned Status turns to 04 but it never advances to 05 or 06 even if we follow the BQ34Z100-G1 TRM and SLUA925 guide. Any support to identify the root cause and help us complete the learning cycle so we can create the golden image is much appreciated.
Below are our setup:
We use the BQ34Z100EVM with a minor modification for the voltage divider ratio (unless the evm cannot be used to run through the learning cycle). The battery we used is Panasonic BK120AAHU (1200mAh), which BQStudio happens to have it in the database (Chem ID: 0641), it is configured in 7S2P. Some of the essential configurations:
Design Capacity (also Qmax Cell 0) = 2400mAh
Design Energy = 20160mWh
Terminate Voltage = 1000 mV (we have used 1100 mV before but same result)
NiMH Cell Negative Delta Volt = 8mV (Panasonic datasheet suggests 5 - 10mV delta Volt)
NiMH Cell Negative Delta Time = 16s
NiMH Cell Neg Qual Volt = 10000 mV
We followed the guidance for setting up the registers for the battery in the data memory section (see attached exported gg.csv file for configuration) and ran through the full discharged (~C/5 rate), relax (until VOK is cleared), full recharged (~C/2 rate), and relax (until VOK is cleared) cycle - several times. The RUP_DIS flag is always clear, both VOK and OCVTAKEN are all changing according to the guide, FC flag is set when battery is full but the Learned Status is always 04. We have also read through the forum and aware that the Learned Status will not update from 04 to 05 during the recharge and it is only update during discharge, but in our case, it doesn't seem to change at all.
I'm performing another learning cycle with logs being captured, and I'll attached the log when the cycle completed.
