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

Package Options

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

6.4.3 Light Range Selection

The OPT4041 has an automatic full-scale-range setting mode that eliminates the need for a user to predict and set the optimal range for the device. Set the RANGE register to 0xC to enter this mode. The device determines the appropriate full-scale range to take the measurement based on a combination of current lighting conditions and the previous measurement.

If a measurement is towards the low side of full-scale, then the full-scale range is decreased by one or two settings for the next measurement. If a measurement is towards the upper side of full-scale, the full-scale range is increased by one setting for the next measurement.

If the measurement exceeds the full-scale range, resulting from a fast increasing optical transient event, the current measurement is aborted. This invalid measurement is not reported. If the scale is not at the maximum, the device increases the scale by one step and a new measurement is retaken with that scale. Therefore, during a fast increasing optical transient in this mode, a measurement can possibly take longer to complete and report than indicated by the CONVERSION_TIME configuration register.

Using this feature is highly recommended because the device selects the best range setting based on lighting conditions. However, there is an option to manually set the range. Setting the range manually turns off the automatic full-scale selection logic and the device operates for a particular range setting. Table 6-3 lists the range selection settings.

Table 6-3 Range Selection Table
RANGE register setting CH0 Typical Full-Scale Light Level

CH0 Exponent

 CH1 Typical Full-Scale Light Level

CH1 Exponent
0 613lux

0

0.202mW/cm2

0
1 1227lux

1

0.403mW/cm2

1
2 2454lux

2

0.807mW/cm2

2
3 4907lux

3

1.61mW/cm2

3
4 9815lux

4

3.23mW/cm2

4
5 19629lux

5

6.45mW/cm2

5
6 39259lux

6

12.91mW/cm2

6
7 78517lux

7

12.91mW/cm2

6
8 157035lux

8

12.91mW/cm2

6
12 Determined by automatic full-scale range logic; sets channel 0 and channel 1 independently