SBOSA84 December   2022 OPT4048

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 CIE
      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
        3. 8.3.3.3 Threshold Detection
      4. 8.3.4 Device Functional Modes
        1. 8.3.4.1 Modes of Operation
        2. 8.3.4.2 Interrupt Modes of Operation
        3. 8.3.4.3 Light Range Selection
        4. 8.3.4.4 Selecting Conversion Time
        5. 8.3.4.5 Light and Color Measurement
        6. 8.3.4.6 Light Resolution
        7. 8.3.4.7 Programming
          1. 8.3.4.7.1 I2C Bus Overview
            1. 8.3.4.7.1.1 Serial Bus Address
            2. 8.3.4.7.1.2 Serial Interface
          2. 8.3.4.7.2 Writing and Reading
            1. 8.3.4.7.2.1 High-Speed I2C Mode
            2. 8.3.4.7.2.2 Burst Read Mode
            3. 8.3.4.7.2.3 General-Call Reset Command
            4. 8.3.4.7.2.4 SMBus Alert Response
    4. 8.4 Register Maps
      1. 8.4.1 ALL Register Map
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Electrical Interface
      2. 9.2.2 Design Requirements
        1. 9.2.2.1 Optical Interface
      3. 9.2.3 Detailed Design Procedure
        1. 9.2.3.1 Optomechanical Design
      4. 9.2.4 Application Curves
    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
      3. 9.5.3 Soldering and Handling Recommendations
  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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.4.6 Light Resolution

The OPT4048 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
CONVERSION_TIME register Conversion Time MANTESSA effective bits EXPONENT 0 1 2 3 4 5 6
Full-scale lux 2254 4509 9018 18036 36071 72142 144284
Effective Resolution in lux
0 600 us 9 4.4 8.8 17.6 35.2 70.45 140.9 281.8
1 1 ms 10 2.2 4.4 8.8 17.6 35.2 70.45 140.9
2 1.8 ms 11 1.1 2.2 4.4 8.8 17.6 35.2 70.45
3 3.4 ms 12 550.4 m 1.1 2.2 4.4 8.8 17.6 35.2
4 6.5 ms 13 275.2 m 550.4 m 1.1 2.2 4.4 8.8 17.6
5 12.7 ms 14 137.6 m 275.2 m 550.4 m 1.1 2.2 4.4 8.8
6 25 ms 15 68.8 m 137.6 m 275.2 m 550.4 m 1.1 2.2 4.4
7 50 ms 16 34.4 m 68.8 m 137.6 m 275.2 m 550.4 m 1.1 2.2
8 100 ms 17 17.2 m 34.4 m 68.8 m 137.6 m 275.2 m 550.4 m 1.1
9 200 ms 18 8.6 m 17.2 m 34.4 m 68.8 m 137.6 m 275.2 m 550.4 m
10 400 ms 19 4.30 m 8.6 m 17.2 m 34.4 m 68.8 m 137.6 m 275.2 m
11 800 ms 20 2.15 m 4.30 m 8.6 m 17.2 m 34.4 m 68.8 m 137.6 m

As shown in the table above the resolution of the device is dependent on the CONVERSION_TIME and full-scale range. A similar scaling applies to the peak responsitivity for each channel.