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Battery charger and Gas Gauge temperature sensing

Yuval Klein
Expert 1100 points
Other Parts Discussed in Thread: BQ24035, BQ27510-G2

Hello,

I intend to use in my circuit the bq24035 charger and the bq27510-G2 gas gauge. Both of the components have an input for the thermistor in the battery pack, what is the best way to use the thermistor in both IC's?

Thanks,

Yuval

  • 0
    TI__Genius 14985 points

    Because the biasing circuits are different you cannot connect the same thermistor to both ICs.  You should connect the battery thermistor to the fuel gauge since it needs accurate temperature measurements of the cell for accurate gauging.  It also uses the thermistor presence for detection battery insertion and removal.

    Then you can connect the fuel gauge BAT_GD pin to the charger's CE pin.  The gauge dataflash can be configured to assert the BAT_GD pin when the temperature is outside a specified range.  The actual temperature range and the polarity of the BAT_GD pin are configurable.  Just use a dummy resistor on the charger's TS pin to make it think that it's sunny and 25C constantly.  When it is outside of the safe charging temperature range then the gauge can disable the charger with the CE pin.  Some chargers don't have CE pins so you can instead connect the fuel gauge BAT_GD pin to the charger's TS circuit and short it to ground, for example.

  • 0 in reply to dMax
    Expert 1100 points

    Thanks a lot. I will do as you suggested.