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Original question:

BQ34Z100: discharging NiMH -> Voltage drift?

BQ34Z100: Firmware setting

Jason Shen
Intellectual 1965 points
Part Number: BQ34Z100

Dear experts

We have some confuse of this device as below:

1. if the charger is still higher than the TAPER CURRENT, but the FC have been set to 1, does this normal?

2. if the discharge current is high, so the voltage drop of the battery is high, this will make the SOC jump to 0, customer want to know if there have some work around in this condition?

3. learn cycle, UPDATE STATUS  start from 0x04, and after 5hours, it changed to 0X06, no 0x05 state, so this is a success learn cycle?

4. after learn cycle, the QMAX have a update, but the Ra table do not have change, so will this firmware working for the production?

5. after the learn cycle, the SOC jump from 0 to 23%, so this is because of the reset order? and judge the SOC just form the cell voltage.

6. for mass production, after load the firmware, should customer doing some order sequence? like reset, IT_ENABLE?

Thanks

B.R.

Jun Shen

  • 0
    TI__Expert 3030 points

    Hi Jun,

    Could you please upload the log and .gg files so that we can debug further?

    Best Regards,

    Abraham

  • 0 in reply to Abraham Rashid
    TI__Expert 3030 points

    Hi Jun,

    Looking at the log data, I don't think the learning cycle is successful. 

    For a successful learning cycle, you need to discharge the battery to empty, relax for 5 hours, then charge to full (FC is set), relax for 2 hours (update status =0x05), then discharge by 0.2C rate to empty, relax for 5 hours (update status =0x06), as indicated in the figure below. 

    I don't see "charging from empty to full" section in the data. Also, you need to avoid sudden changes of voltage and current, which will effect Qmax and Ra update.

    After loading the firmware, customer can do any needed tests, then reset and enable IT, seal (if needed) then ship.

    Best Regards,

    Abraham