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OPT3101: About OPT3101 register values

mahiro.aikawa
Prodigy 80 points
Part Number: OPT3101


I have two questions regarding the OPT3101 register.

opt3101 datasheet
・About his FREQ_COUNT_REG at register address 11h
What are the conditions that change the value of this register?

- Read the register from 1h to b9h.
The value of "RESERVED" in "Register 5h" changes every time I perform a measurement.What is the reason for this change? What does “RESERVED” here mean?

For example:
1st time 5h:808c0
2nd time 5h:808c8
Why? ?

  • 0
    TI__Genius 9380 points

    mahiro-san,

      Each register is 24bits long and contails multiple functions. All of this information is in the data sheet.

    Register 5 contains I2C transaction data and reserved is used by TI during production. There is no meaning or function for researved.

      

    Register 11 contains 3 functions. Read the data sheet to understand what each function represents. 

  • 0 in reply to Gordon Varney
    Prodigy 80 points

    I have an additional question

    - Is there a possibility that the "RESEARED" value changes automatically when measuring with OPT3101?
    Is the “RESEARED” value the same forever? ?

    ・What is the value of AMPLITUDE that guarantees the accuracy of the distance value of OPT3101?

  • 0 in reply to mahiro.aikawa
    TI__Genius 9380 points

    mahiro-san,

    The only people that know what Reserved is for is the TI validation team. It would be best to parse out the bits you need and ignor the rest. 

    This part is not a DTOF (Direct Time of Flight) part. It is an ITOF (Indirect Time of Flight). It uses a standard I/Q data demodulation technique to calculate distance. That means it uses amplitude to determine what quadrant it should use, then it uses phase angle to calculate the distance. For this reason a full calibration is required in order for the part to know what quadrant to use in order to get an accurate distance measurement.

      I recommend that you read up on I/Q data demodulation to understand what the amplitude, phase and quadrant terms mean.