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OPT3001: OPT3001 application

Nanfang Liao
Intellectual 2085 points
Part Number: OPT3001

Hello team,

My customer uses our OPT3001, it is on a small board, and they put the board in a small box, the size of the box is very similar with a matchbox, there is a transparent window in front of the box, the size of the window is about 1cm*0.8cm.

If they put the board outside, the light is about 100 lux, but if they put the board in the small box, the read the light is about 50 lux, which is much lower. Do you have any suggestion how to improve the accuracy when put it in the box? Thanks

Regards,

Nanfang

  • 0
    TI__Intellectual 2100 points
    Hey Nanfang
    Just to clarify so it's clear, the circuit is electrically identical correct?
    Nick
  • 0
    TI__Intellectual 2100 points

    Nanfang,

    I'm just going to assume that it is for now, let me know if that is not the case. The following application note, "OPT3001: Ambient Light Sensor Application Guide" should give you a wealth of information on how to adjust for the case you're seeing. I would bet that the biggest issue for you is the field of view  (FoV) of the window. I don't know if the sensor is flush to the viewing window or what material it is, but in the past FoV has been one of the greatest oversights for people. One simple fix would be to take a measurement of lux with no enclosure and then use that to calibrate the part in the enclosure (process outlined in aforementioned app note). This is a great option since you don't need to modify any mechanical aspects, just take some measurements and multiply by a calculated value.

    If this answered your question, please hit the green "Verify Answer" button below. Let me know if you need additional information or have more questions!

    Best Regards,

    Nick