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

6.1 Overview

OPT4041 measures the ambient light that illuminates the device. This device measures light with a spectral response very closely matched to the human eye, and with excellent infrared rejection.

Matching the sensor spectral response to that of the human eye response is vital because ambient light sensors are used to measure and help create ideal human lighting experiences. Strong rejection of infrared light, which a human does not see, is a crucial component of this matching. This matching makes the OPT4041 especially good for operation underneath windows that are visibly dark, but infrared transmissive.

The wide band channel is sensitive to a broad range of wavelengths, including 850nm and 940nm NIR wavelengths. This enables accurate measurement of a wide range of sources.

OPT4041 is fully self-contained to measure the ambient light and report the result in ADC codes directly proportional to lux digitally over the I2C bus. The result can also be used to alert a system and interrupt a processor with the INT pin. The result can also be summarized with a programmable threshold comparison and communicated with the INT pin.

OPT4041 is by default configured to operate in automatic full-scale range detection mode that always selects the optimal full-scale range setting for the given lighting conditions. There are 9 full-scale range settings one of which can be selected manually as well. Setting the device to operate in automatic full-scale range detection mode frees the user from having to program the software for potential iterative cycles of measurement and readjustment of the full-scale range until optimal for any given measurement. With device exhibiting excellent linearity over the entire 28 bit dynamic range of measurement no additional linearity calibration is required at system level.

OPT4041 can be configured to operate in continuous or one-shot measurement modes. The device offers 12 conversion times ranging from 600μs to 800ms. The device starts up in a low-power shutdown state, such that the OPT4041 only consumes active-operation power after being programmed into an active state.

OPT4041 optical filtering system is not excessively sensitive to non-ideal particles and micro-shadows on the optical surface. This reduced sensitivity is a result of the relatively minor device dependency on uniform density optical illumination of the sensor area for infrared rejection. Proper optical surface cleanliness is always recommended for best results on all optical devices.