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HDC2080: Temperature range and Heater function

Part Number: HDC2080

Hi,

I have 2 question for HDC2080 Datasheet

1.Page 1:Features

I confuse below range. Operating range is over functional range. Please give me definition "Operating", "Functional".

Can we use HDC2080 in –40°C to 85°C? Can we measure –40°C to 125°C?

Temperature range:

– Operating: –40°C to 85°C

– Functional: –40°C to 125°C

2. Page 9: Refer from "8.3.3Heater" 

When do we switch ON in Heater function ? please give me temperature and Humidity for heater.

What kind of scene do we use heater ?



  • Dear Makabe-san, 

    The temperature sensor can be used over the -40 to +125C range, typically according to Figure 3 in the data sheet. The +85C restriction applies to the usage of the heater, it should not be switched on above +85C.

    With regards to heater usage - this is available to "burn off" excess moisture or potentially VoCs that the sensor comes in contact with. in the event you had a scenario (real or test) by which condensation occurred on the polymer itself, the heater could be used to dissipate. 

  • Hi Josh,

    Thank you for answering.

    I have one more question.

    We can measure humidity  0% to 100% in temperature range -40°to 125° ?

    Thanks. 

  • Dear Makabe-san, 

    Yes, the humidity sensor can be used from 0% to 100%RH (non-condensing conditions) and the temp sensor

    the accuracy of the humidity sensor is specified from 0C to 60C, in a 20% to 80%RH (non-condensing) environment. 

    The temp sensor can be used for -40C to 125C, the tight accuracy or center point of it is between 5C and 60C. You can see whole range here on page 6 (Figure 3)

    Does the application involve range of human comfort with respect to temperature and humidity? (this would be end product operating in >30%RH to <60%RH and within ~16°C to ~28°C environment) See image below for what that means if we apply this (what i think is common) use case range to specs of device. Does this help you?

  • Hi Josh

    Thank you for helping me. Accuracy of the sensor is important when we measure temp or humidity.

    By the way I have one more question.What yous said is "condensation occurred on the polymer" in above answer.

    How do we measure whether there is  condensation on the polymer?

    Thanks.

  • if your application is keeping track of the temp and RH%, and can calculate/approximate the dew point from the temp and RH%, then you can make decisions based on the RH% measurement behavior if you see the RH% and the dew point value changing in a way that indicates condensation will occur soon.  

    For example, if you had constant temp of 21C and "saw" the RH rising past a level which would begin to start corrosion (>58%RH), and if left to rise and stay high start the mold process and begin to damage mechanical components, then you can use the data to help control a dehumidifier or alert a maintainer (depending on your system capabilities)