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TMP117: Initialize the calibration setting mechanism

William Zhang2
Intellectual 905 points
Part Number: TMP117

Hi Team,

Customers found that different modules based on tmp117 may have temperature differences when measuring the temperature of the same product.
Do we have a method for TMP117 to initialize the calibration temperature?

Thanks.

BR.

William

  • 0
    TI__Guru* 91206 points

    William -

    What is the delta between units that they are seeing and is this difference being noted while units are in oil bath or chamber or in ambient conditions?

    The TMP117 is very accurate sensor and is not intended to require any calibration. Knowing the test conditions will allow us to provide a more concise response. 

  • 0 in reply to Josh Wyatt
    TI__Intellectual 905 points

    Hi Josh,

    It's about 6℃。I have double checked with customer that's tested under room air temperature condition.

  • 0 in reply to William Zhang2
    TI__Guru* 91206 points

    William - 

    then the parts are likely damaged - can you have a look under the microscope?

  • 0 in reply to Josh Wyatt
    TI__Intellectual 905 points

    Josh,

    Which pins' waveform we need to grab and analysis?

    Customer reported there are eight out of 100pcs have this issue.

  • 0 in reply to William Zhang2
    TI__Mastermind 41195 points

    Hi William,

    We would consider 6C error to be a gross violation of the specification and request the device be returned for analysis. However, it's more likely that the measurement setup is at fault instead of the TMP117 itself. Air (atmosphere) is not ideal for temperature calibration. Common instruments using thermocouples are at best +/-2C accurate. If the TMP117 is inside an enclosure, it may not have adequate air flow. There may be self-heating of other circuits inside the EE enclosure, or there may be a schematic mistake that causes high-current at the TMP117 itself. 

    We would need to review the schematic, the mechanical design of the system with TMP117, and the test setup for the measurement to look for each of these problems.

    Additionally, to clarify, Josh was asking about optical inspection with a microscope.

    Regarding the original question about calibration: since we view 6C error as a gross violation of specification and intended operation, I would not recommend any form of 'calibration.' This should be viewed as a failure. It is not normal variation. 

    thanks,

    ren