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bq24075-Q1: Remove Rp resistor

Patrick Chen
Mastermind 8875 points
Part Number: BQ24075-Q1

Hello,

             if customer just monitor high temp protection that VH: IC's Hot Trip Threshold = 0.3V nominal. if they remove Rp resistor and just let INT flow input thermistor, does the schematics ok? 

              Do we also have RS and RP calculation tool to provide? Thank you.  

BR

Patrick

  • 0
    TI__Intellectual 1980 points

    Hello,

    You need to know the principle, please refer to below description.

    8.3.2 Battery Temperature Monitoring

    The bq2407x continuously monitors battery temperature by measuring the voltage between the TS and VSS

    pins. An internal current source provides the bias for most-common 10 kΩ negative-temperature coefficient

    thermistors (NTC) (see Figure 4). The device 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 (that is, timers are not reset). Charge is resumed when the temperature returns

    to the normal range. The allowed temperature range for 103AT-type thermistor is 0°C to 45°C. However, the user

    may increase the range by adding two external resistors. See Figure 5.



    Regards.