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OPT3001 - Factory Calibration required?

Brian Antheunisse
Expert 5305 points
Other Parts Discussed in Thread: OPT3001

Hey Optical sensing team,

I noticed in the datasheet, it mentions the following:

"The OPT3001 has an automatic full-scale range setting feature that eliminates the need to predict and set the optimal range for the device. In this mode, the OPT3001 automatically selects the optimal full-scale range for the given lighting condition. The OPT3001 has a high degree of result matching between the full-scale range settings. This matching eliminates the problem of varying results or the need for range-specific, user-calibrated gain factors when different full-scale ranges are chosen. For further details, see the Automatic Full-Scale Setting Mode section."

Am I correct in assuming that this means as long as the register settings are correct, you can just populate the part on the board during factory assembly without the need to do any sort of calibration process?

Thanks!

Brian Antheunisse

  • 0
    TI__Prodigy 370 points

    Hi Brian,

    Thanks for the question.   Yes, the intention is that you can just take our part, put it on the PCB and go.   We have an absolute accuracy specification of +/-10%, when many of our customers have an accuracy spec of +/-20%.  For some customers, this eliminates a need for them to calibrate themselves, although that is on a customer by customer need basis.

    Also, the passage you have above has to do with the matching between the full-scale ranges.   Most ambient light sensors have different full-scale range selections.  Very few of our competitors have a specification or any real indication of how the accuracy changes when you switch ranges, they typically specify their accuracy on one chosen range.   And, I know that some of our competitors have quite bad matching between the ranges.  So, if the customer wants to use more than one full scale range, or the range that was not specified, they might be forced to calibrate if their needs require beter accuracy.    OPT3001 has incredibly good matching between the ranges, so it would not require anything special to achieve accuracy on multiple ranges.

    Let me know if that helped,

    James

  • 0 in reply to James Becker
    TI__Expert 5305 points
    Thanks for the info James!

    This does help. One follow up question, do you mean that our accuracy is +/-10%, which is good enough for most customers, but depending on the application/accuracy needed, they may still need to calibrate in the factory anyway?
  • 0 in reply to Brian Antheunisse
    TI__Prodigy 370 points
    Hi Brian,
    If the customer is looking for a +/-5% accuracy performance, he will need to do his own calibration to make that happen.
    If the customer wants a +/-10% accuracy, our part will work fine as is, as long as the customer isn't adding anything else that might create a problem (i.e. a cover glass that attenuates some of the light whith its own tolerace).
    Thanks
    James