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BQ25601: Thermistor measurment with BQ27Z561

Brian Antheunisse
Expert 5305 points
Part Number: BQ25601
Other Parts Discussed in Thread: BQ27Z561,

Hi guys,

We have this charger and gas gauge on our alpha board.  Each IC has a TS pin for measuring the battery thermistor.

 

The battery charger needs a resistor divider between VREGN & GND with the center connected to TS and the NTC thermistor in the battery.

 

The gas gauge just requires the battery thermistor connection directly to the TS pin.

 

Is there a way to have both charger and gas gauge connected to the thermistor?  I would like to be able to read the battery temperature through the gas gauge, but still allow the charger to regulate charging based on temperature.

Thanks,

Brian 

  • 0
    TI__Genius 16125 points
    Brian,
    I think you can let BQ27z561 to monitor battery pack temperature then fine tune BQ25601 charging voltage and charging current via I2C interface.
    It is not ok to connect both chips TS pin together because they will interface each other.
    Thanks