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BQ24195: TS Resistor Network

K.Yaita
Guru 29720 points
Part Number: BQ24195

Hi Team,

I believe 10kΩ resistor should be connected at TS pin as substitute for thermistor even if my customer doesn't need to monitors battery temperature for bq24195.
Is my understanding correct?
Could you also tell me the values of RT1 and RT2 in this case?



Best Regards,
Yaita / Japan disty

  • 0
    TI__Expert 8230 points
    Hello Yaita-san,

    Yes, a 10kOhms resistor can be used in place of a 103AT thermistor along with two resistors to fix the voltage at the TS pin to that of a normal temperature range. RT1 typically is 5.52kOhms and RT2 is 31.23kOhms.
  • 0 in reply to Fernando Lopez
    Guru 29720 points

    Hi 

    Thank you for your support. I understood.

    I would like to ask an additional question.
    My customer wants to use NTC thermister that is built in battery-pack.
    I heard the resistor value is 150kΩ.

    Is it possible to use it with bq24195?
    I believe it isn't recommended because bq24195 recommends 103AT-2 thermistor (10kΩ) but would like to confirm just in case.

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Expert 8230 points

    Hello,

    While the device is optimized to operate with a 103AT thermistor, like mentioned, it might be possible to use a different value thermistor.

    The values for the 2 resistors in the TS network would need to be re-calculated using the new thermistor's nominal impedance (150kOhms) and its impedance at the desired Cold/Hot thresholds using the formulas provided in the datasheet.

    We also have a spreadsheet calculator tool that helps calculate these values.

  • 0 in reply to Fernando Lopez
    Guru 29720 points

    Hi Fernando-san,

    Thank you for your helpful support. I understood.
    Is there any concern if my customer use the following equation with the thermistor other than 103AT-2?



    My customer wants to know if there is.

    Best Regards,
    Yaita