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TMP119EVM: TMP119EVM wrong temperature display in PC GUI

Dan Neacsu
Prodigy 10 points
Part Number: TMP119EVM
Other Parts Discussed in Thread: TMP117, TMP119

Tool/software:

I have a TMP119EVM board.

In PC GUI software it displays a temperature approx. 2 degrees higher that correct one.

D4 LED (red one) lights continuously

  • 0
    TI__Expert 6355 points

    Hi Dan,

    Thank you for reaching out. I have a few questions to learn more about the issue that you are having with the EVM. Are you testing the device in a temperature controlled environment? What are you using as your reference and what is the temperature accuracy rating of this reference? If no reference is being used, how do you determine that the temperature is 2 degrees higher than the correct one? The fact that D4 is steady means that the MCU is powered and communicating with the software properly--for this reason I would like to learn more about the setup and test environment.

    Best regards,

    Simon Rojas

  • 0 in reply to Simon Rojas Avila
    Prodigy 10 points

    The test was performed in an oil bath with the temperature regulated by an Arroyo 5400-15-28 temperature controller with a platinum RTD class AA sensor.

    The oil bath was stirred continuously once per second.

    The temperature of the oil bath was monitored by a RTD sensor calibrated to an error less than 0.03 degrees Celsius between minus 50 to 200 degrees Celsius.

    Also in the oil bath I have 3 TMP117 sensors.

    These sensors report a temperature with less than 0.05 degrees error between all of them and between our RTD sensor.

    The test was performed between 0 to 40 degrees.

    In TMP119EVM user guide on page 5, table 2.2, is stated that D4 LED status is OFF when EVM is connected to EVM GUI

  • 0 in reply to Dan Neacsu
    TI__Mastermind 41235 points

    Hi Dan,

    If you are plugging in multiple EVMs, the software could easily be confused about which one it is connected to. Even so, the encoding for TMP117 is the same as TMP119 and couldn't produce a 2 degree error. It seems more likely that something about your setup is causing heating of the TMP119. There could also be a solder mistake on your EVM sample. I could get another TMP119EVM shipped to you if you send me a private message with your shipping address.

    thanks,

    ren