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OPT3101:

Paul Archer
Prodigy 20 points
Part Number: OPT3101

Hi there,

We have a design involving OPT3101 for distance measurement. So we got the EVM board to learn how to do the calibration before the calibration on our own design. 

We had the crosstalk_temperature and phase_temperature calibration done on the EVM board but the phase_ambient light calibration seems not reasonable. 

Could you help to confirm the crosstalk_temp and phase_temp calibration result is properly? 

The below picture shows the crosstalk vs temperature and phase vs temperature graph by OPT3101_SDK. 

     

And then I calculated the coeff. as the SBAU310 mentioned.

Multiply the xtalk vs temp slopes with 2^(-5+SCALE_TEMP_COEFF_XTALK) for the xtalk_temp coeff. 

The phase_temp is calculated by .

Could you advise what the values are for SCALE_TEMP_COEFF_XTALK and SCALE_PHASE_TEMP_COEFF? 

Thanks.

  • 0
    TI__Genius 9675 points

    Hi Paul,

    Our experts on this device are out of the office at the moment, but we will try to get you an answer early next week.

    Jalen

  • 0
    TI__Expert 6800 points

    Hi Paul,

    I apologize for the late reply on this.

    To get SCALE_TEMP_COEFF_XTALK, first find the slope of in-phase IPHASE_XTALK and quadrature phase crosstalk QPHASE_XTALK component versus temperature, then multiply that value by 2^(-5+SCALE_TEMP_COEFF_XTALK), but choose the SCALE_TEMP_COEFF_XTALK such that the result is between -128 and 127.

    SCALE_PHASE_TEMP_COEFF should be chosen similarly by measuring the slope of phase (PHASE_OUT) vs temperature (TMAIN), and multiplying that result by 2^(10-SCALE_PHASE_TEMP_COEFF), but choose the SCALE_PHASE_TEMP_COEFF value such that the coefficient is maximum but < 2047.

    Thank you,

    Brent Elliott