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BQ27220: BQ27220

Afdeling Inkoop
Prodigy 10 points
Part Number: BQ27220

Background

We programmed the battery profile to the BQ device as I received from TI. BQ27220 device is programmed during the bootup of the device. In our device firmware, we have to do certain device actions as per the battery charge percentage. In our device, we have the below issues.

Issues

  • Battery percentage reported by BQ is low compared to the battery voltage.
  • BQ reports 2%, but the battery voltage is quite high, ideally it should be reporting as 20%.

Question

  • Every time, When BQ27720 reports the battery charge as 2% and if we shutdown the device because of the low battery, does the learning algorithm inside the BQ device, adjusts the 2% as the new zero percent? BQ device is not shutdown and always powered by the battery, but only the MCU is shutdown in our device.
  • What is the issue for the BQ to report low battery percentages despite the battery voltage remaining is high.
  • 0
    TI__Mastermind 24741 points

    Hello Afdeling, 

    Is the BQ27220 device power cycling? If the BQ27220 device is power cycling then the device will revert to the default configuration data. A way to check this would be to read a value from one of the configuration registers and check if the value is the default value.

    Regards,

    Jonny.