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OPT3001: About Device Illumination and Illuminance response

Rogers Chen
Intellectual 825 points
Part Number: OPT3001
Other Parts Discussed in Thread: OPT3006

Dear TI experts,

I saw this description in the OPT3006 datasheet: "The 3-dimensional geometry illustrated in Figure 31 must permit greater than 66% of the sensor to be illuminated at a 30° angle of incident light", if the lighting area or device Illumination is less than 66%, For example 50%, what problems does it cause? Will the error of the OPT3006's output result become larger? Also, can you explain what illuminance response means? Many thanks!

  • 0
    TI__Genius 9675 points

    Hi Rogers,

    With a smaller device illumination it results in a smaller Field of View. Having a smaller field of view will result in a less accurate reading of the lighting in the environment, so yes this would cause the error from OPT3006 output result to become larger from a system perspective.

    The illuminance response is a weighted representation of how much light can be sensed depending on the incidence angle. For example, a light source entering the device from a 60° angle will not have as much of an effect on the lux reading as a source that is entering at a 20° angle. Assuming light entering at a 0° angle will give you a full response of the lux level, this value will become less as the angle is increased. This is shown in the chart (Figure 13) below.

    Our TI Precision Labs video "Integrating a Light Sensor in your Design" covers this topic.

    Thanks,

    Jalen

  • 0 in reply to Jalen Tate89
    Intellectual 825 points

    Hi Jalen,

    Thanks for your reply. According to the explanation of the supplier, illuminance response is equivalent to Device Response, which means that the illuminance response value within 30° is 0.75~1 (max=1). Is it right？And what is the meaning of “net system response > 50%” in the following description? Is it a benchmark for normal use of IC? Is it necessary for the device to work?

    Many thanks!

  • 0 in reply to Rogers Chen
    TI__Genius 9675 points

    Rogers,

    Yes, you're understanding is correct that the illuminance response value within ±30° is ~0.75 - 1. Generally a good response/illumination of the sensor will be ±50° in most applications. This is considered a good response to get valuable information of the intensity of light in the environment.

    Jalen

  • 0 in reply to Jalen Tate89
    Expert 1920 points

    Hi Jalen

    Would you be able to help, please?

    I keep getting notifications about this thread - not sure why. I also tried to unsubscribe but the link to "unsubscribe" that is part of the mail notification does not work it leads to a "Page not found". 

  • 0 in reply to Chris Cavillon
    TI__Genius 9675 points

    Chris,

    Sorry, not sure what the issue could be. You can try clicking the button shown below.

    Jalen