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HDC1010 / "Ambient Operating Temperature" and "Functional Operating Temperature"

K.Yaita
Guru 29690 points

Hi Team,

Could you clarify a difference between "Ambient Operating Temperature" and "Functional Operating Temperature"?



Best Regards,
Yaita / Japan disty

  • 0
    TI__Expert 5145 points

    Hi Yaita-san,

    The "Ambient Operating Temperature" is the recommended temperature range for the humidity sensor.

    The "Functional Operating Temperature" represents instead the temperature limits outside of which the humidity sensor accuracy could start to drift.

    Prolonged operations outside the "Functional Operating Temperature" can result in fact in a RH accuracy shift as shown in table 11 at page 19.

    Please let me know if this reply to your question.

    Best regards,

    Carmine

  • 0 in reply to Carmine Iascone
    Guru 29690 points

    Hi Carmine-san,

    Thank you for your reply.
    However I couldn't catch why temperature range of 71～84℃ isn't recommended from your comment.
    Is there any reason that temperature range of 71～84℃ isn't recommended?

    Best regards,
    Yaita

  • 0 in reply to K.Yaita
    Guru 29690 points

    May I have your comments?
    If my question is unclear please let me know.

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Expert 5145 points

    Dear Yaita-san,

    Sorry for the delay in the answer.

    The reason why the temperature range of 71～84℃ isn't recommended is due to the fact that in this temperature range the RH accuracy can drift in condition of high humidity, even if the humidity is below the recommended limit of 70%RH. Let me show you same examples:

    • T in the range of -20℃ to 70℃ and RH in the range of 10%RH to 70%RH: no drift is expected and the RH accuracy is 2%RH (Typ. @ T=30℃) as shown in figure 2 page 7.
    • T in the range of -20℃ to 70℃ and RH is outside the recommended operating condition, the RH accuracy drifts a little as shown in figure 17 page 19. In this condition the RH accuracy can drift to a 3/4%RH typ, but it is recovered if the device is reported in recommended operating condition;
    • T is in the functional operating range (for example 80℃) but the humidity is low (for example 40%RH): no drift is expected.
    • T is in the functional operating range (for example 80℃) but the humidity is high (for example 65%RH): the RH accuracy drifts a little but it is recovered if the device is reported in recommended operating condition;
    • T and humidity are both outside of the recommended operating condition (example 85℃/85%RH): the RH accuracy start to significantly drift as reported in table 11 page 19. This drift can be slowly recovered when the part is reported in recommended operating condition

    Please let me know if now is more clear.

    Best regards,

    Carmine

  • 0 in reply to Carmine Iascone
    Guru 29690 points

    Hi Carmine-san,

    I appreciate for your detail explanation.
    I understood.

    Best Regards,
    Yaita

  • 0 in reply to Carmine Iascone
    Intellectual 545 points

    Hello,

    I know it is an old post but I have some questions regarding this. As stated in the datasheet of the sensor, the heater can be used to decrease the offset after long exposure to high T / RH. How can it be quantified and how long should the procedure be? Is there a document or recommendation that I missed? We must perform tests at 45 C / 90 % for at least 4-5 hours and as I read, there is a possibility of the sensor to drift. If this happens (I don't know how to detect it), for how long should I keep the heater on? 

    Hope that makes sense and thank in advance.

    Best regards,

    Mircea

  • 0 in reply to Carmine Iascone
    Prodigy 10 points
    I am looking for sensors that measure various traits and emissions of food. That is produce. meat, fish or processed foodstuffs. Call it the internet of food instead of the internet of things. My partner, Elaine Yu, and I are beginning a company that will test and measure integrity, cleanliness, safety and authenticity of food in China. We are hunting sensors as well as software (already possibly located in a tech startup) that can be loaded or attached onto smartphones. That will allow us to test the food at source all the way to the retailer or consumer. Does TI make sensors that can test food without complex preparation?
    By the way this site is very user-unfriendly. Does TI want prospective customers to ask questions about purchasing products or does it want to chase us away? If it took me about 1-2 weeks to find where to ask a question. I wonder how long it would take to solve a problem if 1 were to arise.
  • 0 in reply to user5075756
    TI__Expert 5695 points

    User50775756,
    All sensing technologies supported by TI products (which are a lot) can be very easily find and explored using the link below:


    Once you find a sensor that fit your needs you can post on e2e using the part number you want to explore.
    With respect to your objective of testing food, you need to quantify on physical parameters. such as temperature and / humidity.