SBOS993A December   2021  – December 2022 OPT4001

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Spectral Matching to Human Eye
      2. 8.3.2 Automatic Full-Scale Range Setting
      3. 8.3.3 Output Register CRC and Counter
        1. 8.3.3.1 Output Sample Counter
        2. 8.3.3.2 Output CRC
      4. 8.3.4 Output Register FIFO
      5. 8.3.5 Threshold Detection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Modes of Operation
      2. 8.4.2 Interrupt Modes of Operation
      3. 8.4.3 Light Range Selection
      4. 8.4.4 Selecting Conversion Time
      5. 8.4.5 Light Measurement in Lux
      6. 8.4.6 Light Resolution
    5. 8.5 Programming
      1. 8.5.1 I2C Bus Overview
        1. 8.5.1.1 Serial Bus Address
        2. 8.5.1.2 Serial Interface
      2. 8.5.2 Writing and Reading
        1. 8.5.2.1 High-Speed I2C Mode
        2. 8.5.2.2 Burst Read Mode
        3. 8.5.2.3 General-Call Reset Command
        4. 8.5.2.4 SMBus Alert Response
    6. 8.6 Register Maps
      1. 8.6.1 ALL Register Map
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Electrical Interface
        1. 9.2.1.1 Design Requirements
          1. 9.2.1.1.1 Optical Interface
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Optomechanical Design (PicoStar Variant)
          2. 9.2.1.2.2 Optomechanical Design (SOT-5X3 Variant)
        3. 9.2.1.3 Application Curves (PicoStar Variant)
    3. 9.3 Do's and Don'ts
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
        1. 9.5.2.1 Soldering and Handling Recommendations (SOT-5X3 Variant)
        2. 9.5.2.2 Soldering and Handling Recommendations (PicoStar Variant)
          1. 9.5.2.2.1 Solder Paste
          2. 9.5.2.2.2 Package Placement
          3. 9.5.2.2.3 Reflow Profile
          4. 9.5.2.2.4 Special Flexible Printed-Circuit Board (FPCB) Recommendations
          5. 9.5.2.2.5 Rework Process
  10. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

8.4.6 Light Resolution

The OPT4001 device's effective resolution is dependent on both the conversion time setting and the full-scale light range. Although the LSB resolution of the linear ADC_CODES doesn’t change, the effective or useful resolution of the device is dependent on the conversion time setting and the full-scale range as per the table below. In conversion times where the effective resolution is lower, the LSBs are padded with 0.

Table 8-5 Resolution Table for the Picostar™ Variant
CONVERSION_TIME register Conversion Time MANTESSA effective bits EXPONENT 0 1 2 3 4 5 6 7 8
Full-scale lux 328 655 1310 2621 5243 10486 20972 41943 83886
Effective Resolution in lux
0 600us 9 640 m 1.28 2.56 5.12 10.24 20.48 40.96 81.92 163.84
1 1 ms 10 320 m 640 m 1.28 2.56 5.12 10.24 20.48 40.96 81.92
2 1.8 ms 11 160 m 320 m 640 m 1.28 2.56 5.12 10.24 20.48 40.98
3 3.4 ms 12 80 m 160 m 320 m 640 m 1.28 2.56 5.12 10.24 20.48
4 6.5 ms 13 40 m 80 m 160 m 320 m 640 m 1.28 2.56 5.12 10.24
5 12.7 ms 14 20 m 40 m 80 m 160 m 320 m 640 m 1.28 2.56 5.12
6 25 ms 15 10 m 20 m 40 m 80 m 160 m 320 m 640 m 1.28 2.56
7 50 ms 16 5 m 10 m 20 m 40 m 80 m 160 m 320 m 640 m 1.28
8 100 ms 17 2.5 m 5 m 10 m 20 m 40 m 80 m 160 m 320 m 640 m
9 200 ms 18 1.25 m 2.5 m 5 m 10 m 20 m 40 m 80 m 160 m 320 m
10 400 ms 19 0.625 m 1.25 m 2.5 m 5 m 10 m 20 m 40 m 80 m 160 m
11 800 ms 20 0.3125 m 0.625 m 1.25 m 2.5 m 5 m 10 m 20 m 40 m 80 m
Table 8-6 Resolution Table for the SOT-5X3 variant
CONVERSION_TIME register Conversion Time MANTESSA effective bits EXPONENT 0 1 2 3 4 5 6 7 8
Full-scale lux 459 918 1835 3670 7340 14680 29360 58720 117441
Effective Resolution in lux
0 600 us 9 896 m 1.792 3.584 7.168 14.336 28.672 47.344 114.688 229.376
1 1 ms 10 448 m 896 m 1.792 3.584 7.168 14.336 28.672 47.344 114.688
2 1.8 ms 11 224 m 448 m 896 m 1.792 3.584 7.168 14.336 28.672 47.344
3 3.4 ms 12 112 m 224 m 448 m 896 m 1.792 3.584 7.168 14.336 28.672
4 6.5 ms 13 56 m 112 m 224 m 448 m 896 m 1.792 3.584 7.168 14.336
5 12.7 ms 14 28 m 56 m 112 m 224 m 448 m 896 m 1.792 3.584 7.168
6 25 ms 15 14 m 28 m 56 m 112 m 224 m 448 m 896 m 1.792 3.584
7 50 ms 16 7 m 14 m 28 m 56 m 112 m 224 m 448 m 896 m 1.792
8 100 ms 17 3.5 m 7 m 14 m 28 m 56 m 112 m 224 m 448 m 896 m
9 200 ms 18 1.75 m 3.5m 7 m 14 m 28 m 56 m 112 m 224 m 448 m
10 400 ms 19 0.875 m 1.75m 3.5 m 7 m 14 m 28 m 56 m 112 m 224 m
11 800 ms 20 0.4375 m 0.875 m 1.75 m 3.5 m 7 m 14 m 28 m 56 m 112 m