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HDC2010: Control method of the heater

Kai Nomiyama
Expert 5285 points
Part Number: HDC2010

Hi Team,

could you help to know how we should utilize heater function depending on external environment?

- what event/output data result should trigger the heater on?

- what event/ output data result should trigger the heater off?

--> fixed time? any temperature? or anything else?

- once we use heater, do we have any cooling time(the time we should wait from 1st heating to 2nd heating)?

I found following e2e and if you made guide for heater, could you share it with me?

"I will do my best here to try to guide you here - and it is a topic that I think deserves more attention in our documentation, which is on me now - so look for future updates to cover this topic. "

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/815568/hdc2080-about-the-control-method-of-the-heater/3018883?tisearch=e2e-sitesearch&keymatch=HDC%252520AND%252520heater#3018883

Regards,

Kai

  • 0
    TI__Guru* 90906 points

    Dear Kai - 

    Section 4 of the HDC2 Silicon Users Guide is regarding the heater. https://www.ti.com/lit/ug/snau250/snau250.pdf 

    Regarding your questions: 

    1. Crossing or getting close to the dewpoint temperature (twice, meaning a condensing environment was created and completed) would be a good trigger point for turning on the heater - for example - this would be were external %RH value goes up to cross dewpoint and then comes back down. This would involve using presets either in the threshold registers and utilizing the DRDY/INT pin and/or monitoring (keeping track of) temp and %RH in the firmware driving the HDC device. 

    2. The overall heater performance is layout dependent - using thermal relief around the part (copper keep out or full cutout) will yield best results. A characterization of the heater capability during development of the PCB is recommended, as part of the system validation that a responsible integrator will be doing anyway to check the accuracy of the sensors, firmware logic, etc. Below are images of various layouts to give you clear idea here of exactly what is meant by layout dependent.

    3.  As stated, the heater performance is layout dependent - the parts can heat up fastest when there is good thermal isolation. During characterization phase, you can turn heater on (on several parts) to see how hot they can get and how long that takes. Could be anywhere from a few seconds or longer. Observed complete cool off time might be in the scale of minutes. I am not sure you would need to heat it a second time, probably really depends on the environment.