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Using a bq2407x charger with a bq26500: does the charger still need a temperature sensor on the pack?

Daniel Cross
Prodigy 205 points
Other Parts Discussed in Thread: BQ26500

Does the bq2407x charger ic still need access to a pack-based thermistor, or can the bq26500 report the pack temperature directly to the charger ic? If so, how would that work?

  • 0
    TI__Guru*** 146875 points

    The bq2407x compares the voltage on the TS pin against the internal V(LTF) and V(HTF) thresholds to determine if charging is allowed. Once a temperature outside the V(LTF) and V(HTF) thresholds is detected, the device immediately suspends the charge. The device suspends charge by turning off the power FET and holding the timer value (i.e., timers are not reset).

    One option would be to disable the bq2407x TS function by tying it to ground with a 10kohm resistor and then using the bq26500's GPIO to control the bq2407x's CE to disable charge when the temperature is outside the acceptable temperature window for charging.  The only draw back would be the bq2407x timers would be reset.