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BQ28Z620: Learning Cycle

Part Number: BQ28Z620
Other Parts Discussed in Thread: BQSTUDIO

Tool/software:

Hi,

We are currently developping a product using the BQ28Z620 gauge and are trying to perform the learning cycle on the product's battery.

To simplify the process, we used the BQ28Z620EVM-071 evaluation board with the battery, instead of the real hardware.

Using BQ Studio, the gauge settings were reset to their default values.

Following this learning procedure, we entered the initial settings:

  • Design capacity: 2100mAh
  • Design voltage: 7.4V (2-cells)
  • Term voltage: 6V
  • Taper current:
  • Discharge current threshold: 100mA (default)
  • Charge current threashold: 50mA (default)
  • Quit current: 10mA (default)

Then, after discharging a first time and charging back at C/2, the TC and FC flags were never set.

Looking at the configuration, the voltage thresholds for both the TC and FC are set at 4100V and clear at 4000V.

However, when charging, the voltage reached 8.45V before the cell overvoltage protection COV kicked in, with the TC and FC flag still cleared.

Could you provide us with more information about the conditions that triggers the end of charge?

Thank you,

  • Hello Sebastien,

    Can you send a log file of you attempting the learning cycle?

    Regards,

    Adrian

  • Hi,

    Is the log file generated using BQ Studio? If so, can you provide the steps to export it?

    In the meantime, we are attempting the learning cycle again. I'm not sure if this will make the log file invalid.

    Thanks,

  • Hello Sebastien,

    Yes, the log file can be generated by BQStudio. It is recommend to have a log file running while completing the learning cycle, this file helps us debug any issues that can occur. In the register tab, there is a "Start Log" button in the top right corner.

    Regards,

    Adrian