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HDC2010: Data freezes when exposed to heavy light

kolimator
Prodigy 20 points
Part Number: HDC2010

Hi i did some tests with HDC 2010. In my application HDC is uncovered. The sensor is very close to the 50W bulb so that the light is directed between the sensor and the pcb. When I turn on the bulb, the sensor freeze. Sensor is responding but the data doesn't change. When I turn off the light bulb, the sensor starts sending the correct data.

Have you experienced this problem?

best regards

  • 0
    Prodigy 20 points

    I made a short movie showing the problem: https://youtu.be/irrB3RQpjww

    //edit

    When i perform soft reset before each conversion and bring HDC close to bulb it shows -40*C and humidity 0%

    Seems like sensor is not able to perform conversion under strong light

  • 0 in reply to kolimator
    TI__Genius 11750 points
    Howdy kolimator,

    You are correct. There are correct handling and storage procedures when using the HDC devices, these are better explained in the document below. Additionally, I've included a snippet from a more current datasheet that explains the conditions required when using these sensors.

    Storage and handling: www.ti.com/.../snia025.pdf

    Humidity sensors require special care when it comes to storage, handling, and ambient exposure. As the sensor is exposed, special care must be taken as any particles, vapors, etc could possible contaminate the sensor, and therefore corrupt the reading. Long exposures to UV light, visible light or high concentration chemical vapors for prolonged periods may shift the RH output and should be avoided. Exposure to to high concentrations of out-gassed solvent vapors for long times should be avoided during manufacturing, transport and operation. In addition to these handling requirements, the sensors require a specific standard reflow when mounting the devices onto a PCB. The sensor is qualified to withstand soldering profile according to IPC/JEDEC J-STD-020 with peak temperatures at 260C.

    Best Regards,
    Matt