SBOSAC8 December   2024 OPT4041

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 I2C Interface Timing Requirements
    7. 5.7 I2C Timing Diagram
    8. 5.8 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Spectral Response
        1. 6.3.1.1 Channel 0: Human Eye Matching
        2. 6.3.1.2 Channel 1: Wide Band
      2. 6.3.2 Automatic Full-Scale Range Setting
      3. 6.3.3 Output Register CRC and Counter
        1. 6.3.3.1 Output Sample Counter
        2. 6.3.3.2 Output CRC
      4. 6.3.4 Threshold Detection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Modes of Operation
      2. 6.4.2 Interrupt Modes of Operation
      3. 6.4.3 Light Range Selection
      4. 6.4.4 Selecting Conversion Time
      5. 6.4.5 Light Measurement in Lux
      6. 6.4.6 Threshold Detection Calculations
      7. 6.4.7 Light Resolution
    5. 6.5 Programming
      1. 6.5.1 I2C Bus Overview
        1. 6.5.1.1 Serial Bus Address
        2. 6.5.1.2 Serial Interface
      2. 6.5.2 Writing and Reading
        1. 6.5.2.1 High-Speed I2C Mode
        2. 6.5.2.2 Burst Read Mode
        3. 6.5.2.3 General-Call Reset Command
  8. 7 Register Maps
    1. 7.1 Register Descriptions
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Electrical Interface
        1. 8.2.1.1 Design Requirements
          1. 8.2.1.1.1 Optical Interface
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Optomechanical Design
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
        1. 8.5.2.1 Soldering and Handling Recommendations
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Mechanical Data
    2. 11.2 Package Option Addendum
    3. 11.3 Tape and Reel Information

6.4.7 Light Resolution

The effective resolution of the OPT4041 is dependent on both the conversion time setting and the full-scale light range. Although the LSB resolution of the linear ADC_CODES does not change, the effective or useful resolution of the device is dependent (as per Table 6-5) on the conversion time setting and the full-scale range. In conversion times where the effective resolution is lower, the LSBs are padded with 0.

Table 6-5 Channel 0 Resolution Table
CONVERSION_TIME REGISTERCONVERSION TIMEMANTISSA EFFECTIVE BITSEXPONENT
012345678
FULL-SCALE LUX (Effective Resolution in Lux)
6131227245449079815196293925978517157034
0600µs91.1982.3964.7929.58519.1738.3476.68153.35306.71
11ms10599.04m1.1982.3964.7929.58519.1738.3476.68153.35
21.8ms11299.52m599.04m1.1982.3964.7929.58519.1738.3476.68
33.4ms12149.76m299.52m599.04m1.1982.3964.7929.58519.1738.34
46.5ms1374.88m149.76m299.52m599.04m1.1982.3964.7929.58519.17
512.7ms1437.44m74.88m149.76m299.52m599.04m1.1982.3964.7929.585
625ms1518.72m37.44m74.88m149.76m299.52m599.04m1.1982.3964.792
750ms169.36m18.72m37.44m74.88m149.76m299.52m599.04m1.1982.396
8100ms174.86m9.36m18.72m37.44m74.88m149.76m299.52m599.04m1.198
9200ms182.34m4.86m9.36m18.72m37.44m74.88m149.76m299.52m599.04m
10400ms191.17m2.34m4.86m9.36m18.72m37.44m74.88m149.76m299.52m
11800ms200.585m1.17m2.34m4.86m9.36m18.72m37.44m74.88m149.76m
Table 6-6 Channel 1 Resolution Table
CONVERSION_TIME REGISTER CONVERSION TIME MANTISSA EFFECTIVE BITS EXPONENT
0 1 2 3 4 5 6
FULL-SCALE IRRADIANCE (µW/cm2)
202 403 807 1610 3230 6450 12910
Effective Resolution (nW/cm2)
0 600µs 9 393.83 787.66 1575.32 3150.64 6301.29 12602.57 25205.15
1 1ms 10 196.92 393.83 787.66 1575.32 3150.64 6301.29 12602.57
2 1.8ms 11 98.46 196.92 393.83 787.66 1575.32 3150.64 6301.29
3 3.4ms 12 49.23 98.46 196.92 393.83 787.66 1575.32 3150.64
4 6.5ms 13 24.61 49.23 98.46 196.92 393.83 787.66 1575.32
5 12.7ms 14 12.31 24.61 49.23 98.46 196.92 393.83 787.66
6 25ms 15 6.15 12.31 24.61 49.23 98.46 196.92 393.83
7 50ms 16 3.08 6.15 12.31 24.61 49.23 98.46 196.92
8 100ms 17 1.54 3.08 6.15 12.31 24.61 49.23 98.46
9 200ms 18 0.769 1.54 3.08 6.15 12.31 24.61 49.23
10 400ms 19 0.385 0.769 1.54 3.08 6.15 12.31 24.61
11 800ms 20 0.192 0.385 0.769 1.54 3.08 6.15 12.31