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OPT3101EVM: Persistent strong phase offset despite running SDK first time bringup

Thomas Perraton
Prodigy 10 points
Part Number: OPT3101EVM
Other Parts Discussed in Thread: OPT3101

Hi,

I am using the SDK with the first time bring up procedure.

Despite using the cache and set distance phase offset measurements, a strong off set appears due to the switching of the illumination DAC to high/low value.

I am running the first time bringup with receiving diode cover, then 10mm and 20mm phase offset calibration.
Depending on the situations, I am getting around 300 up to 14000 unit phase offsets when the ADC switches currents.
If you see a mistake in my mode of operation I would be very grateful to get feedback from you,
those are the results I get from the first time bring up :
INFO::Resetting Host
INFO::Performing Internal Cross talk Measurement...
Read mask for register 0x2e is 0x00000e00   Resolved Value is 3
Read mask for register 0x3b is 0x00ffffff   Resolved Value is 16768469
Read mask for register 0x3c is 0x00ffffff   Resolved Value is 6582
INFO::Internal Cross talk Measurement Completed
      I,      Q,S, ScaledI, ScaledQ,tMain,tIlum,tMain(C),  tIlum(C),Magnitude
-008747,+006582,0,-0008747,+0006582, 0000, 0000,     +00, +0000,   35

INFO::Cover Photodiode with optical shied for illumination Cross talk measurement
INFO:Performing Illum Crosstalk for TX0 HDR 0
      I,      Q,S, ScaledI, ScaledQ,tMain,tIlum,tMain(C),  tIlum(C),Magnitude
+019247,-002686,0,+0019247,-0002686, 2304, 0000,     +32, +0000,   61

INFO:Performing Illum Crosstalk for TX0 HDR 1
      I,      Q,S, ScaledI, ScaledQ,tMain,tIlum,tMain(C),  tIlum(C),Magnitude
+022019,-002915,1,+0044038,-0005830, 2312, 0000,     +33, +0000,  142

INFO:Completed Illumination cross talk measurement for all channels
INFO::Loading Illumination cross talk Set
Set Target to distance [0010]mm
Press any Key to continue:
INFO:Performing Phase Offset for TX0 HDR 0 @ ref Distance 10mm
PhOfft,rfDCod,ilmScl,ilmDac, fqCnt
012885,000043,     0,    08, 16384,
Phase,Amplt,SigOl,AmbOl,Amb,tMain,tIlum,tMain(C),  tIlum(C)
12928,13162,    0,    0,068, 2304, 0000,     +32,

Set Target to distance [0200]mm
Press any Key to continue:
INFO:Performing Phase Offset for TX0 HDR 1 @ ref Distance 200mm
PhOfft,rfDCod,ilmScl,ilmDac, fqCnt
012766,000874,     0,    31, 16384,
Phase,Amplt,SigOl,AmbOl,Amb,tMain,tIlum,tMain(C),  tIlum(C)
13640,07534,    0,    0,068, 2304, 0000,     +32,
Best regards,
Thomas
  • 0
    TI__Mastermind 25895 points

    Hi Thomas,

    Can you also share the data collected after calibration performed where you see the shift? Distance, phase, amplitude, temp, etc will be helpful to see

    Are you using the SDK with the MSP430 launchpad calibration tool mode or running on your own MCU? Are you using custom PCB you have designed?

    Also can you share background on your application/use-case for my background?

    Best,

    Alex

  • 0 in reply to Alex Bhandari-Young
    Prodigy 10 points

    Hi Alex,

    thank you for your prompt reply,

    You will see attached the data I got:

    I was  measuring steps of 20mm from 10mm to 450mm.

     

    I am using the SDK with my own MCU.

    The application is meant for medium distance ranging of the size of a thumb.

    Best regards.

  • 0 in reply to Thomas Perraton
    TI__Mastermind 25895 points

    Hi Thomas,

    Can you share amplitude as well?

    Best,

    Alex

  • 0 in reply to Alex Bhandari-Young
    Prodigy 10 points

    Hi Alex,

    Here is the corresponding amplitude for the session :

    Best regards,

    Thomas

  • 0 in reply to Thomas Perraton
    Prodigy 10 points

    Hi Alex,

    Does the data help you  ? Feel free to ask me more questions,

    Best regards,

    Thomas

  • 0 in reply to Thomas Perraton
    TI__Mastermind 25895 points

    Hi Thomas,

    It is still tough to tell what is happening. Can you share the raw data files (should have phase, distance, temp, amplitude, as well as HDR setting of device). Also what are you doing in this test? Can you give picture and description of steps in the test setup and data collection?

    Best,

    Alex

  • 0 in reply to Alex Bhandari-Young
    Prodigy 10 points

    Hi again Alex,

    Here is a data sample:

    As you will see when i move away the targetted object (a thumb sized bloc) the amplitude diminishes to the threshold level where the hdr starts to use a higher illumination current, this brings the a bit amplitude higher as the emitter goes stronger.


    My problem is that in my opinion, something is missing in my firmware to enable the phase offset compensation, and leaves a strong phase offset in the result.

    I will share with you the settings I used asap

    Time Distance Amplitude Tmain mm
    0.0009639263153 2907 89 39 0
    0.1103060246 2903 90 39 -4
    0.1115427017 2923 89 39 16
    0.112716198 2906 88 39 -1
    0.1138927937 2900 86 39 -7
    0.1150863171 2885 85 39 -22
    0.1162779331 2876 83 39 -31
    0.1175062656 2878 83 39 -29
    0.1187353134 2875 83 39 -32
    0.1199910641 2882 65 39 -25
    0.1216783524 2798 64 39 -109
    0.1228795052 2795 65 39 -112
    0.1240744591 2812 64 39 -95
    0.1718747616 2790 64 39 -117
    0.2199442387 2791 65 39 -116
    0.2690386772 2803 64 39 -104
    0.3178744316 2805 65 39 -102
    0.4767515659 2818 65 39 -89
    0.4784436226 2815 65 39 -92
    0.4799234867 2822 65 39 -85
    0.5140435696 2818 65 39 -89
    0.562810421 2817 66 39 -90
    0.6119339466 2817 69 39 -90
    0.6609427929 2834 74 39 -73
    0.7099707127 2868 80 39 -39
    0.7590122223 2863 81 39 -44
    0.8079226017 2838 74 39 -69
    0.8569271564 2828 69 39 -79
    0.9059808254 2641 39 39 -266
    0.9549617767 2616 38 39 -291
    1.003819227 2622 37 39 -285
    1.052945137 2618 37 39 -289
    1.101886749 2612 37 39 -295
    1.15081954 2609 37 39 -298
    1.264039278 2631 37 39 -276
    1.265335083 2588 37 39 -319
    1.296909094 2589 38 39 -318
    1.345847607 2633 37 39 -274
    1.394984722 2624 39 39 -283
    1.443961382 2640 42 39 -267
    1.492933989 2641 138 39 -266
    1.541932821 2632 554 39 -275
    1.590875387 3031 1167 39 124
    1.639858961 3033 1434 39 126
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    48.24353385 2853 138 39 -54
    48.29259062 2851 138 39 -56
    48.34175253 2855 139 39 -52
    48.39066029 2864 139 39 -43
    48.4397676 2869 151 39 -38
  • 0 in reply to Thomas Perraton
    TI__Expert 6800 points

    Hi,

    I'm taking a look at this and I should have an answer for you early next week.

    Thank you,

    Brent Elliott

  • 0 in reply to Brent Elliott
    Prodigy 10 points

    Hi Brent,

    To complete my previous answer to Alex, I am using the i2c interface and going through this procedure .

    (at initialization) dev.calibrationSession_firstTimeBringUp();

    (every 100ms) dev.liveDataView(1, dev.configurationFlags_frameTimeInMilliSeconds, true);

    Thanks for the help.

    Thomas Perraton

  • 0 in reply to Thomas Perraton
    TI__Expert 6800 points

    Hi Thomas,

    Do you have a picture of your setup with the target you are calibrating with? It might be good to start with a larger target to calibrate to see if field of view of the emitter is affecting the calibration. Could you also send me data above including the HDR mode values? Also, you have negative values in the "mm" column of your data. Which column is the actual distance and which is the device measured distance?

    Thank you,

    Brent Elliott

  • 0 in reply to Brent Elliott
    Prodigy 10 points

    Hi Elliot,

    Thanks your for the help and sorry for  the late reply.

    You can find attached a picture of the setup. I am using the I2C interface with the OPT3101EVM pins, as a prototype.

    Concerning the negative results you rightfully pointed it is a relicate from a previous work that I did not mean to send you, sorry for this. Here are more data of an attempt I made with the following settings :

    this->reg.hdr_thr_high = 27000; // //High Threshold
        this->reg.hdr_thr_low = 5000;    // //Low Threshold
        this->reg.en_adaptive_hdr = 1;    // //Enables adaptive HDR feature

    this->reg.illum_dac_h_tx0 = 10;     // //High Current settings [173.6mA:5.6mA X 31]
        this->reg.illum_scale_h_tx0 = 0; // //Illum scale for H [173.6mA:5.6mA X 31]
        this->reg.illum_dac_l_tx0 = 10;     // //High Current settings [043.4mA:1.4mA X 31]
        this->reg.illum_scale_l_tx0 = 3; // 3 ;// //Illum scale for H [043.4mA:1.4mA X 31]

    Data.csv

    the calibration outputed the following results:

    INFO::Resetting Host
    INFO::Writing Initialization sequence I2C registers
    INFO::Performing Internal Cross talk Measurement...
    INFO::Internal Cross talk Measurement Completed
          I,      Q,S, ScaledI, ScaledQ,tMain,tIlum,tMain(C),  tIlum(C),Magnitude
    -010346,+006501,0,-0010346,+0006501, 0000, 0000,     +00, +0000,   39

    INFO::Cover Photodiode with optical shied for illumination Cross talk measurement
    INFO:Performing Illum Crosstalk for TX0 HDR 0
          I,      Q,S, ScaledI, ScaledQ,tMain,tIlum,tMain(C),  tIlum(C),Magnitude
    +006070,+000609,0,+0006070,+0000609, 2312, 0000,     +33, +0000,   18

    INFO:Performing Illum Crosstalk for TX0 HDR 1
          I,      Q,S, ScaledI, ScaledQ,tMain,tIlum,tMain(C),  tIlum(C),Magnitude
    +013214,+001845,0,+0013214,+0001845, 2312, 0000,     +33, +0000,   41

    INFO:Completed Illumination cross talk measurement for all channels
    INFO::Loading Illumination cross talk Set
    Set Target to distance [0010]mm
    Press any Key to continue:
    INFO:Performing Phase Offset for TX0 HDR 0 @ ref Distance 10mm

    PhOfft,rfDCod,ilmScl,ilmDac, fqCnt
    015082,000043,     3,    10, 16384,
    Phase,Amplt,SigOl,AmbOl,Amb,tMain,tIlum,tMain(C),  tIlum(C)
    15125,08211,    0,    0,068, 2312, 0000,     +33,

    Set Target to distance [0200]mm
    Press any Key to continue:
    INFO:Performing Phase Offset for TX0 HDR 1 @ ref Distance 200mm

    PhOfft,rfDCod,ilmScl,ilmDac, fqCnt
    012748,000874,     0,    10, 16384,
    Phase,Amplt,SigOl,AmbOl,Amb,tMain,tIlum,tMain(C),  tIlum(C)
    13622,14649,    0,    0,068, 2312, 0000,     +33,

    INFO::Loading Phase Offset Set
    INFO::Completed First Time bring up
    INFO::Validating I2C Transaction
    INFO::I2C Transaction Successful

    I hope this will help you see clearer.

    Best regards,

    Thomas

  • 0 in reply to Thomas Perraton
    TI__Expert 6800 points

    Hi Thomas,

    What is the actual distance in the test? I would need to see the reference distance to compare with the measurements.

    Also can you use the method described here in step 4?

    https://e2e.ti.com/support/sensors/f/1023/t/727462?-FAQ-OPT3101EVM-Troubleshooting

    We want to see residual crosstalk before and after calibration.

    Can you also readout the phase offset register and let me know the result?

    Can you also use a larger target and see how this affects the results?

    Thank you,

    Brent Elliott

  • 0 in reply to Brent Elliott
    Prodigy 10 points

    Hi Brent,

    Sorry, I realize the previous data are difficult to interpret as the offset is taking all the space.

    I gave you extra data here:

    You will notice the offset is milder here, I think it is because I reduced the DAC current. (176mA->40mA)

    0513.Data.csv

    For the test, I moved the target from 20mm to 300-350mm from the sensor, by coming back and forth.

    You will see that the distance is rising then falling in the blue chart.

    In red, the amplitude also rise and falls accordingly with the proximity of the target (my hand in this scenario) it triggers or deactivate the HDR, which causes the sharp changes in amplitude.

    You will also notice that instead of having a perfect triangular profile for the distance, a strong non-linearity occurs on the HDR switching. 

     

    I tried reading the phase offset correction registers as you suggested: here are the results:

    --> phase offset TX0 HDR0=14958 phase offset TX0 HDR1=11927  

    it matches with the result given by the first time bring up routine.

    I would be interested if you could confirm wether my results are normal for a EVM board,

    The residual cross talk is around 2-3 maximum.

    Thanks a lot for your time,

  • 0 in reply to Thomas Perraton
    TI__Expert 6800 points

    Hi Thomas,

    Thanks for providing this data. I'll get back to you about this as soon as I can.

    Thank you,

    Brent Elliott

  • 0 in reply to Brent Elliott
    Prodigy 10 points

    Hi Brent,

    I was wondering if things were making sense with the data we transmitted you,

    tell me if you got anything else you would like to know about the issue,

    Thanks in advance,

    Thomas

  • 0 in reply to Thomas Perraton
    TI__Expert 6800 points

    Hi Thomas,

    Our apps engineer who is an expert on the OPT3101 is currently out of office but will be back early next week. I will get back to you when I can go over this with him.

    Thank you,

    Brent Elliott

  • +1 in reply to Thomas Perraton
    TI__Expert 6800 points

    Hi Thomas,

    This behavior is not expected with the EVM but it is hard for us to say what the cause is. I mentioned earlier using a larger target for the phase offset calibration and testing. This will help rule out the field-of-view being an issue. It would also be worth checking the EVM with its base calibration and GUI to confirm this issue is from your calibration.

    Thank you,

    Brent Elliott

  • 0 in reply to Brent Elliott
    Prodigy 10 points

    Hello Brent and Alex,

    Thanks a lot for the technical support and your time .

    I could not find exactly why my implementation was not giving the expected result with the phase offset calibration but but using a larger target gave me the proper values for my setup. I will check with the base values from the GUI to double check, thanks for the suggestion,

    I can use the sensor to the range I expected so I consider the issue solved, thanks to your help.