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OPT3101: Distance jumps after a reset

Markus Stadler1
Prodigy 135 points
Part Number: OPT3101

I have used the OPT3101 on a custom board and made the following observation: If I reset the sensor-system (or reboot) the distance reading jumps between two distinct values (plus some noise), as seen in the graph below. This happens both in amplitude and phase/distance.

After reset my system loads setup-data from an external eeprom (connected to the microcontroller, not to the OPT3101) in to the OPT3101.

The OPT3101 runs in continuous mode and no HDR is used. The setup parameters in eeprom include cal-parameters for crosstalk and phase-offset, but not for square-wave nonilnearity or temperature.

What could be the reason for those distance jumps?

  • 0 in reply to Markus Stadler1
    Prodigy 135 points

    Here is also a plot of Phase/Amplitude, showing 4 distinct states after resetting OPT3101 sensor system.

  • 0 in reply to Markus Stadler1
    TI__Mastermind 25815 points

    Hi Markus,

    Our device expert is out for the holidays so may be some delay getting back here until after the holidays.

    Best,

    Alex

  • 0 in reply to Markus Stadler1
    Prodigy 135 points

    Another Info: Plotting the above in a polardiagram reveals the 4 distinct phase/amplitude states seen after OPT3101 reset (each blue cross is a measurement after a system reset).

    It seems that this constellation  not depending on the location: It looks the same independent of the amplitude or phase (distance)

    I guess OPT3101 internally samples at 40MHz. Using 10MHz light modulation there is an 90 degree phase ambiguity between sampler and illumination driver after each system reset.

  • 0 in reply to Markus Stadler1
    TI__Mastermind 25815 points

    Hi Markus,

    Thanks for the additional details. Will follow up with you after holidays.

    Best,

    Alex

  • 0 in reply to Alex Bhandari-Young
    TI__Mastermind 25815 points

    Hi Markus,

    Could you please share the raw data as well here?

    Best,

    Alex

  • 0 in reply to Alex Bhandari-Young
    Prodigy 135 points

    Hi Alex,

    below is a dataset showing three rows: Distance, Amplitude, Phase. It was taken w/o calibration and with the PD covered.

    I have recorded 10 measurements, then reset the device, then 10 measurements again, and so on.

    Best,

    Markus

    # Created by Octave 5.1.0, Tue Jan 26 08:16:40 2021 GMT
    # name: Dist_RawAmplitude_RawPhase
    # type: matrix
    # rows: 201
    # columns: 3
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     958 211 4158
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     1487 182 6500
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     1377 215 6017
     1379 216 6027
     965 205 4219

  • 0 in reply to Markus Stadler1
    TI__Mastermind 25815 points

    Hi Markus,

    My apologies for the delay here. I am still looking into this and will send an update by end of this week.

    Best,

    Alex

  • 0 in reply to Alex Bhandari-Young
    TI__Mastermind 25815 points

    Hi Markus,

    This is not expected from the device and i am having trouble replicating. How many devices do you see this happening on? Are you able to replicate this on the EVM?

    Best,

    Alex