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TMP421: Regarding the TMP421 Specifications

Kyohei
Expert 2956 points

Part Number: TMP421

Hi team,

We are considering using the TMP421 to measure the temperature of our device. The device has TEMP_A (anode) and TEMP_K (cathode) pins for temperature measurement, with an internal diode embedded between them. We plan to apply approximately 4.0 V to TEMP_A and 3.3 V to TEMP_K, assuming that the forward voltage (Vf) between TEMP_A and TEMP_K will vary depending on temperature. We expect the voltage difference to be in the range of 0.67 V to 0.78 V.

Questions:

  • We are considering using the device in the manner described above. Is this usage appropriate?

  • Since the register resolution is 0.0625 °C/LSB (1/16 °C), does this mean that the internal ADC resolution is approximately 12 bits?

Best regards,

Kyohei

  • 0
    TI__Intellectual 2230 points

    Hello Kyohei,

    To answer both questions,

    - Only the V+ pin is meant to have voltage applied to it, where the device will force current through the D+ line and find the temperature by measuring the voltage through the BJT. If you would like to provide more information or a schematic of your application I could give you a more precise answer.

    - The internal ADC resolution is 12 bits.

    Best,
    Gage