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AM2612: Inquiry Regarding Temperature Measurement Accuracy

Lawrence Wang
Prodigy 580 points
Part Number: AM2612

Tool/software:

Hi experts,

Our customer has raised the following questions regarding the MCU temperature measurement accuracy:

  1. Based on the table provided, the calculated MCU temperature appears to be only in the teens when the surface feels hot to the touch, while other measurement points are generally around 40 degrees. The manual mentions that the error can reach up to 8 degrees. How can such low-precision temperature measurements effectively monitor the range?

  2. Sometimes, the customer feels that the error exceeds the documented 8 degrees, as in the case above. What factors could influence the accuracy of the temperature measurement?

  • 0
    TI__Expert 4990 points

    Apologies for the delay,

    My understanding is that the error should be a relatively fixed offset. For example, the temperature sensor will read 2 degrees lower than the actual temperature. 
    As for the error, it is mainly dependent on the current source accuracy and the IR drop.
    For best accuracy, it is recommended to connect VDD_TEMP to the 1.2V/1.25V power rail.

    Regards,

    Susan