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BQ76942: BQ76942

jason park
Prodigy 20 points
Part Number: BQ76942

As shown in the attachment, we are inquiring about a temperature measurement problem with TI BQ76942's TS1 and TS3 NTC

Additionally, if have a any necessary data or information plz supply to us

 Attachment: Incorrect reading of TS1 NTC value by BQ76942.pdf

  • 0
    TI__Mastermind 42060 points

    Hello Jason,

    To get the best accuracy, you will want to calibrate it. 

    You should put the thermistor resistance vs. temperature on our BQ769X2-THERMISTOR-COEFF-CALCULATOR coefficient calculator. Using these coefficients will provide the best accuracy. Can you try creating these coefficients and try again?

    Vref1 or Vref2 does not affect the NTC measurement. The thermistor measurements are ratio-metric. This means that the ADC reference voltage and pull-up voltage are the same. So the ADC error can be ignored.

    Best Regards,

    Luis Hernandez Salomon