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How can i use the BQ27210 as a simple coulomb counter for capacity indication?

Vincent Kerkhofs
Prodigy 10 points
Other Parts Discussed in Thread: BQ27210

I want to use the BQ27210 as a simple coulomb counter to estimate the remaining charge in a battery.

I don't have the time to work out a full implementation of the fuel gas gauge.

I'm only interested in indications

75-100%

50-75%

25-50%

10-25%

<10%

 

How could i implement this with the BQ27210.

We already designed this in our system but due to deadlines aren't able to spend the time to do a full gas gauge implementation.

 

Please help!

 

Vincent Kerkhofs

  • 0
    TI__Genius 14985 points

    This app note should be your starting point for just using the bqJunior as a coulomb counter or "battery monitor":

    http://focus.ti.com/lit/an/slua347/slua347.pdf

    If you have time later to determine the proper coefficients to use for a complete battery gauge solution, you can program the EEPROM in production with the new values, but for systems in the field you could do a field update.  You can use the commands to overwrite the RAM values instead of using the EEPROM values with your newly determined constants, but every time the gauge is power cycled the host will need to overwrite them.