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BQ27Z561EVM-011: Power management forum

Part Number: BQ27Z561EVM-011
Other Parts Discussed in Thread: GPCCHEM

Tool/software:

Learning cycle procedure

The battery has been fully charged, but the [LStatus] register does not change from 0x04 to 0x05.

What are the conditions for it to become 0x05?

What conditions must be met to move on to the next step?

Do I need to review the data memory values, etc.?

<procedure>
1. Test is performed at room temperature. If the cell was at a different temperature, then let the cell relax for
two hours at room temperature prior to the test.
2. Use the GAUGE_EN command in the Command window. Use the RESET command in the Command
window. Confirm that the [LStatus] register has updated to 0x04.
3. Discharge the battery at C/5 until the battery reaches term voltage.
4. Relax the battery for 5 hours.
5. Charge using CC until the battery reaches the Full Charge Voltage.
6. Charge using CV at the Full Charge Voltage. Cut off CV charging at a point in between [CHG Current
Threshold] and [Quit Current].
7. Let the battery relax for two hours to reach full equilibrium open circuit voltage (OCV). The [LStatus] register
updated to 0x05.
8. Discharge the battery at C/10 rate until the [Term Voltage] is reached.
9. Let the battery relax for five hours to reach full equilibrium OCV. The [LStatus] register has updated to 0x06.

Thank you

  • Hello Kugimoto,

    The main condition for LStatus register to update to 0x05 is that 90% of the DOD range is covered during charge. I will need a few things from you to analyze why the learning cycle is failing. Can you send me the gg file from the gauge, the data sheet of the battery you are using, and the log file of the learning cycle attempt. How did you obtain the ChemID you are using? Did you use the GPCCHEM tool?

    Regards,

    Nick Richards