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BQ40Z50-R1: calculator coeff resitor RT1

anthony gascon20
Intellectual 370 points
Part Number:
BQ40Z50-R1

Hello everyone, I am concerned with determining the temperature coefficients for the temperature sensor of the settings (RT1).

I could get the basic calculator from bq40z50family but I do not see how to determine the coef for resistance rt1 I chose to take the resistance of your evaluation board CRCW120610K0JNEA

Best regards Anthony

  • 0
    TI__Guru* 76230 points
    hI Anthony,

    Are you using a different thermistor other than what was recommended in the BOM? if you are using the same thermistor, you do not need to change anything. What document are you referencing for doing the calculation if you are using a different thermistor.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Intellectual 370 points
    hi Onyx,

    The document that is referencing for doing the calculation coeff thermistance
    Is in this post
    e2e.ti.com/.../434108

    I do not see how to determine the coef for resistance rt1 I chose to take the resistance of your evaluation board CRCW120610K0JNEA

    Best regards Anthony
  • 0 in reply to anthony gascon20
    TI__Guru* 76230 points
    H Anthony,

    Pls use this recommended pTC for RT1 PRF18BA103QB1RB. The default settings on the EVM will work with the PTC thermistor. What is on our EVM is just a resistor. If you decide to go with a different other than what i just recommended, you can use the excel sheet to calculate the coefficients, but make sure to reference the internal schematic for the PTC pin on the data sheet of the device. The PTC pin is biased to Bat while the NTC is biased to ground.

    thanks
    Onyx