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OPT4048: Black Value Fluctuations Following Counter Value Changes

lee hyeonjun
Prodigy 50 points
Part Number: OPT4048

Tool/software:

I am experiencing an issue where the black value appears to fluctuate in response to changes in the counter value. The black value should ideally remain stable, but it seems to be following variations in the counter.

I have observed that the counter value resets when it reaches 0 and gradually increases up to 15. The conversion time is set to 600 microseconds, and the range is set to 0.

Could you provide insights into why this might be happening? Are there any potential causes such as hardware interference, software-related issues, or sensor calibration errors? Additionally, what methods can be used to stabilize the black value and ensure it remains unaffected by the counter value?

Any suggestions or debugging steps would be greatly appreciated.

  • 0
    TI__Expert 3530 points

    Hi Lee,

    I understand that you are seeing fluctuations in the device's output value; however, could you explain what you mean by "black value"?

    Also, the counter value has no correlation with the sensor's response. What type of light source are you using for this test? It seems like your very low conversion time (600us) is picking up fluctuations in the light source output. Could you please check if this occurs if you increase this to a higher conversion time (800ms)? This should average any flicker component that might be present out of the end result.

    Thanks,
    Daniel

  • 0 in reply to Daniel Balmaceda
    Prodigy 50 points

    Hi Daniel,

    The issue occurs regardless of the conversion time, and it has not been resolved yet. There is no mention of this phenomenon in any datasheet or related documents. However, when I measure it using my sensor, this phenomenon always appears.

    Regarding the "Black Value," the issue becomes more prominent in dark conditions. This does not mean that the issue does not occur in bright conditions. Rather, in dark conditions, other factors do not interfere, making this phenomenon more noticeable. In bright conditions, other data points are also output, which might obscure the effect I am describing.

    In fact, this issue may not be limited to dark conditions. The key point is that the data tends to increase to some extent depending on the counter value.

    Best regards,
    Lee

  • 0 in reply to lee hyeonjun
    Prodigy 50 points

    Using light Source is Green Source(450um)

  • 0 in reply to lee hyeonjun
    TI__Expert 3530 points

    Hi Lee,

    So the data you sent previously is with the device in a dark environment under a green (450nm) source? Are you placing the device inside an enclosure to simulate a dark environment? Is it sealed correctly and is it fixed in place?

    Is this data being logged from the GUI? Could you send me the full data log? Let me see what other things might be affecting this.

    Thanks,

    Daniel