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BQ27421-G1: Fuel gauge bq27421-G1 initialization

Shlomi Yehezkia
Mastermind 6150 points
Part Number: BQ27421-G1

Hi Team,

My customer aim to use the fuel gauge bq27421-G1.

Their application can be found (after manufacturing process) on the shelf for a while.

Therefore, they are traying to save power when the system is in off state.

 

One solution is to use bidirectional load switch that will disconnect the fuel gauge from battery. This means the fuel gauge will lose the calibration data since it is stored on ROM.

 

My question

Is the fuel gauge (bq27421-G1) is able to receive the calibration data (from the host when the system power-up) and function properly?

According to the impedance track method of TI, the fuel gauge needs only few moments to analyze the battery properties and reports state-of-charge (%)                                                                                   

Thanks,

Shlomi

 

  • 0
    TI__Guru* 76230 points

    Hi Shlomi,

    It is an absolute requirement that the host writes the back the learned data back to the gauge  when  a POR occurs. Your understanding of how the gauge works is not exactly correct. The gauge needs to be configured and then it learns the characteristics of the battery. It a POR occurs on a ROM gauge, all configured and learned data is wiped out. Pls see the quick start guide of the device for further details

    thanks

    Onyx