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TMP112 Drift

Mattias Jalenius
Prodigy 60 points
Other Parts Discussed in Thread: TMP112

Hi I am planning to fairly accurate measure air temperature and I have found TMP112 that with callibration could do the job, thus datasheet specifies a pritty large drift.

Long-Term stability typicaly <1 lsb for 3000h, we plan to use the device for 10years resulting in a typical drift below 1.8*C. This is way out of our requirements.

 

What is the data behind this number? tests? simulation?

 

Best Regards

Mattias Jalenius

 

 

  • 0
    TI__Expert 7945 points

    Hello Mattias,

    Thank you for posting your question on the stability of TMP112. I will inquire into your request with our Sensors team and get back to you soon.

    Regards,

    Abhi

  • 0
    TI__Expert 7945 points

    Hello Matthias,

    First of all thank you for looking into TMP112 for your application needs. We performed rigorous testing to determine the numbers specified in the data sheet.

    To summarize our testing, five batches of 32 TMP112 devices were tested in an isothermal fluid bath held at 25°C, then placed in an oven under high temperature operating life test (HTOL) conditions at 150°C with a total test time of 500 hours. The actual temperature was measured using a NIST calibrated temperature probe. These tests were performed on the TMP112 with continuous power at 150°C over a 500 hour period, these results simulate the behavior of the part after a multi-year period under normal operating conditions (-40 to +125°C).

    From our results we found that after 300 hours the TMP112 will drift by no more than ±1LSB (± 0.625°C) and that the worst-case measurement error will not exceed ±0.3°C during the lifetime of the TMP112, with the most error occurring within the first 184 hours of life. Based on this information, the TMP112 should continue to meet data sheet performance specifications throughout its lifetime.

    Hope this helps and if you need specific details please don't hesitate to contact me directly at abhishekmuppiri@ti.com. I can share with you the specifics on our test data, results and details of our test setup.

    Best Regards,

    Abhi Muppiri

    Applications Engineer

    AIP- Sensing Products

    Texas Instruments 

  • 0
    TI__Expert 4905 points

    Hi Mathias,

    I was wondering what your application is?

    Thanks!