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HDC2080: Dripping a drop test into the sensor window

ttd
Mastermind 8600 points
Part Number: HDC2080

 

Dear Technical Support Team,

 

I have some questions about HDC2080.

 

■My test

I drip a drop(①water②oil) to top window of humidity on package .

■Evaluation result

①water

Before：Humidity of evaluation emviroment(20%RH) → After：change from 20%RH to 0%RH(inpossible to detect humidity?)

 

②oil

Before：Humidity of evaluation emviroment (20%RH) → After：change from 20%RH to 10%RH

 

※After heat run to clear water or oil , sensor humidy is returned correctly.

 

＜Questions＞

・Why HDC2080 can't detect relative humidity with ①water?

   Why HDC2080 can't detect relative humidity with ②oil?

・ Do you have a plan of new device to protect the sensor window like IP67?

My consideration:

A: Humidity is rate of water vapor, so a dorp is big grain. is it imposible to absorb the moisture with polymer?

B: Sensor short to GND Electrically and degrade the resister value?

C: Electrical conductivity difference between water and oil?

 

Best Regards,

ttd

  • 0
    TI__Guru* 91206 points
    Dear ttd -
    As with all humidity sensors, the HDC devices must follow special guidelines regarding handling and storage that are not common with standard
    semiconductor devices. You are indicating that you are exposing the sensor directly to 100% condensed moisture (i.e. a drop of water) - which is outside the recommended operating conditions of the device.
    Please refer to notes 6 & 11 on page 5 here: www.ti.com/.../hdc2080.pdf
    I would expect the oil to have an effect as well, as it is probably dampening the response of the polymide as the oil probably acts as a barrier to stop the polymide from absorbing moisture effectively.

    I am glad you said the heater resolves the device back to normal operation.

    For further reference, please see: www.ti.com/.../snaa318.pdf and www.ti.com/.../snia025.pdf

    With regards to devices with IP67 support - we normally do not discuss roadmap devices on E2E Forum. Please contact your local TI Sales team to engage in that manner.