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TMP116: Were all of TMP116 electrical characteristics data taken in a oil bath?

Kazuya Nakai59
Guru 21605 points
Part Number: TMP116

 Hello guys,

 One of our customers is considering using TMP116 for their temperature sensitive products.

 They would like to know whether all of TMP116 electrical characteristics data were taken in a oil bath

or not. Also they want to know whether all of TMP116 typical characteristics data were taken in a oil bath

or not.

 Could you please tell me your comment?

 Your reply would be appreciated.

 Best regards,

 Kazuya Nakai.

  • 0
    TI__Mastermind 37370 points
    Hi Kazuya-san,

    Thank you so much for bringing great opportunities to our product line. The characterization parameters was mostly done in oilbath such as temperature accuracy. If you are interested on specific parameters, please let me know.

    Hope this helps. Let me know if you have further question.

    Aaron
  • 0 in reply to Aaron Heng
    Guru 21605 points
    Hi Aaron,

    Thank you very much for your reply.
    Could I ask you an additional question?
    I think the reason for using the oil bath measurement is higher measurerment accuracy is necessary. Is this correct?
    In the customer application, TMP116 is used for the ambient temperature measurment.
    Then is the accuracy described in the device datasheet guaranteed because the heat capacity of oil is higher than air?
    The customer thinks that TMP116 might show higher temperature in the air than oil bath case by TMP116 self heating.

    Could you please give me your answer?

    Thank you and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 37370 points
    Hi Kazuya-san,

    In order to get the best temperature accuracy, we characterized the device in the oilbath with precision reference thermometer. The heat density of the oil is much higher than air because the heat transfer from fluid is more efficient than air. If you want to reduce the self-heating, you might want to reduce the number of averaging configuration and/or setting the device in one single mode so that you can place the device into shutdown to reduce power consumption.

    We have a few apps note that might be helpful below.

    www.ti.com/.../technicaldocuments

    Let me know if you have further question.

    Aaron
  • 0 in reply to Aaron Heng
    Guru 21605 points
    Hi Aaron,

    Thank you for the prompt reply.
    Could I ask you again about the temperature accuracy in TMP116 datasheet (SBOS740)?

    1. Can TI guarantee the data of "Temperature accuracy" described on page 5 in both cases, oil and air as ambient material?
    Or oil only?
    2. When the customer uses TMP116 in air, do they need to correct read data using a coefficient of "DC power-supply sensitivity" described on Page5? For example, If they get 25.00C data from TMP116 using one-shot mode with 8 average and 3.3V as V+, do they need to subtract 66mC (=20mC(Typ)*3.3V=66mC=0.066C) from the original data to get higher accuracy temperature data?

    Thank you again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 37370 points
    Hi Kazuya-san,

    I would recommend to read the apps note that I wrote for ambient air temperature measurement. It is not possible to design a system with high accruacy measurement if you consider the layout techniques and material use for your system. The TMP116 accuracy and capibility should not vary in different mediums. The TMP116 is ready to use out of the box with the best accuracy. It is not necessary to calibrate the offset correction in order to achieve the high accuracy.

    Aaron