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OPT8320: Temperature compensation & Integration time

Joyce Wang
Prodigy 10 points
Part Number: OPT8320

Hi,

I have some questions about temperature compensation & Integration time when I using OPT8320.

We know the temperature compensation formula as above, can I know

1. What the CALIB_PREC means?

2. What effect caused by the calibration scale setting =1 or =16?  (There is no obvious difference after I changing it.)

3. Why need to do both illumination & sensor temperature phase compensation at same time?  (I think these two are related.)

 

Another question is about Integration time.

I saw the example shows the intg_time = 8, and I want to know how to decide it?


Thanks in advance.

Joyce

  • 0
    TI__Expert 3800 points
    Hi Joyce,

    Calib Prec allows you to have higher precision coefficients. For example, if you want to have temperature coefficient of 4.125, it is possible to use calib prec to do this. You would have to program the temperature coefficients to see any appreciable change in calib prec. Illumination and sensor temperatures usually follow each other closely. However, as they both fundamentally affect the phase measurement, we have provided 2 separate correction mechanisms. You are free to use only 1 of them and leave the other one as 0.

    intg_time represents a fraction of the exposure time of the camera. This is a very fundamental setting of the camera which affects a lot of performance parameters. Please read the system design guide to understand more: www.ti.com/.../sbau219

    Regards,
    Subhash