OPT3101: Difference of calibration at different temperature points

Amy Luo

Part Number: OPT3101

Hi team,

After the temperature compensation coefficient is calculated, the internal crosstalk value of OTP3101 is calibrated. It is found that different effects are produced according to different calibration temperature points

When calibrated at 70 ℃, the amplitude value is below 10. When the temperature is changed, the amplitude value is less than 15 in the range of 40-85 ℃;

When calibrated at 40 ℃, the amplitude value cannot be reduced to below 10. When the temperature rises to 85 ℃, the amplitude value drifts about 25;

Note: it is calibrated according to manual method!!!

Question: during the internal crosstalk calibration, is the current temperature matched with the coefficient stored in pairs?

over 4 years ago

0 Alex Bhandari-Young over 4 years ago

TI__Mastermind 25895 points

Hi Amy,

Is this illumination crosstalk you mean rather than internal crosstalk? Internal crosstalk would not be expected to give value 10 when calibrated, but illumination xtalk would after calibration applied. Also would like to confirm that xtalk temp coefficients were written to the device during this test where you see variation over temp?

What is the manual method?

For this question, during illumination crosstalk the the xtalk value is compensated based on the I and Q coeffs written to these registers.

Is the SDK being used? Can you please provide the steps used in the SDK for this calibration and testing?

Best,

Alex

0 Amy Luo over 4 years ago in reply to Alex Bhandari-Young

TI__Expert 6895 points

Hi Alex,

Yes, it's illumination crosstalk.

After calibration, the temperature is obtained by reading the internal temperature sensor.

Using the calibration method in the slau791 document.

https://www.ti.com/lit/ug/slau791/slau791.pdf

The calibration function is CaliCrossTalk();

0 Alex Bhandari-Young over 4 years ago in reply to Amy Luo

TI__Mastermind 25895 points

Hi Amy,

The SDK does not have a function called CaliCrossTalk(); can you confirm here?

Best,

Alex

0 Alex Bhandari-Young over 4 years ago in reply to Alex Bhandari-Young

TI__Mastermind 25895 points

Hi Amy,

Closing for now. Please let me know if you still need help here.

Best,

Alex

0 Amy Luo over 4 years ago in reply to Alex Bhandari-Young

TI__Expert 6895 points

Hi Alex,

Thanks for your follow-up. The customer reported that the problem had been solved.

0 Alex Bhandari-Young over 4 years ago in reply to Amy Luo

TI__Mastermind 25895 points

Thanks Amy,

Good to hear.

Best,

Alex

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OPT3101: Difference of calibration at different temperature points