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UCC21750: NTC Resistor value

Xabier Albistegui
Prodigy 80 points
Part Number: UCC21750

Hi, i want to measure the temperature using this AIN pin. 

I already know that the device has an internal current source that delivers 200uA. Must I take into account any other charasteristic in order to find a suitable NTC resistor? 

Thank you

  • +1
    TI__Expert 3860 points

    Hi Xabier, 

    Make sure the voltage on the AIN pin is within its operating range, which is 0.6V to 4.5V. Within the operating range, the duty cycle output has an accuracy of ±3% throughout temperature. Other factors to consider would be the tolerance of the NTC thermistor and the tolerance of other resistors. 

    Let us know if you have other questions! 

    Thanks, 

    Vivian