• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 275 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

OPT3101:Comparison of post-calibration and pre-calibration data

mahiro.aikawa
Prodigy 80 points
Part Number: OPT3101

I would like to compare data with opt3101 calibrated and data without opt3101 calibration correction values.

Currently I am getting the data as follows.
Get the calibrated opt3101 data.
After that, the calibration correction value "0" is input into the register and the data is acquired.
Calibrated and uncalibrated data are acquired and compared.

If I enter "0" as the calibration correction value in the register, will the OPT3101 be in a state where no calibration is being performed?
Specifically, is it best to do the same thing to eliminate calibration correction?

  • 0
    TI__Genius 9675 points

    Hi Mahiro,

    Our OPT3101 expert will get back with you in the next business day.

    Jalen

  • 0
    TI__Genius 9380 points

    Aikawa-San,

      I am not sure you understand this part as shipped from the factory. These parts as shipped have all of the calibration registers set to zero. The actual part operation and calibration is system dependent (optics, PCB, etc) and can't be pre-calibrated. When first powered up the phase and distance measurements are not usable or reasonably accurate. They are in a very unknown state as far as how well they will operate. Calibration is required and expected for a quality measurement. 

    The EVM on the other hand has been calibrated. You can save the stored values set the Calibration register values to zero. That way you can restore the trimmed registers later. This will not help you as the design and layout of the EVM will be different from your design and any information you collect on the EVM will not be usable on your PCB.

    If you are looking to see if these parts can be used without calibration, the answer is not really. You will never be able count on a default accuracy, tolerance or usability from board to board until calibrated. 

    I hope this helps. Let me know if you have any other questions. 

    (Remember that This Monday Sept 3rd in the USA is a holiday. Responses will most likely be on Tuesday)

  • 0 in reply to Gordon Varney
    Prodigy 80 points

    It is an additional question.
    What we want to do is disable the calibration.

    URL:www.ti.com/.../opt3101.pdf MjUwMDE5M2YzNDEyMjM4ZTM4MDUwNmYwMGE3MDY3MDA5M2N8R0ExLjIuMTE5MzUzNDU4MC4xNjkzMjA2MzA1

    Table 8. Phase Offset Correction Registers
    EN_PHASE_CORR 43h [0] Enables phase offset correction

    Does setting this to 0 disable the [Phase Offset] calibration?
    Also, is it possible to disable items that do not have an item to disable the correction value of calibration?

  • 0 in reply to mahiro.aikawa
    TI__Genius 9380 points

    Aikawa-San,

     Yes, setting all of the registers in table 8 will make it so that Phase Offset Correction will not be applied. You are not able to disable any internal hardware, but by setting the calibration registers to "0" will prevent the part from using or applying any corrections. Corrections or calibrations are values applied to the hardware to correct the outcome. If set to zero the hardware will operate in the factory default mode. Some features can be disabled, I suggest that you go through the data sheet and enable or disable as you desire.   

    I also recommend that you read out all of the register settings of a new part and save it as the default condition. Then you can restore the register if needed.