ZHCSQM3 December   2022 OPT3005

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 说明（续）
  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 Timing Requirements
    7. 7.7 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 Human Eye Matching
      2. 8.3.2 Automatic Full-Scale Range Setting
      3. 8.3.3 Interrupt Operation, INT Pin, and Interrupt Reporting Mechanisms
      4. 8.3.4 I2C Bus Overview
        1. 8.3.4.1 Serial Bus Address
        2. 8.3.4.2 Serial Interface
    4. 8.4 Device Functional Modes
      1. 8.4.1 Automatic Full-Scale Setting Mode
      2. 8.4.2 Interrupt Reporting Mechanism Modes
        1. 8.4.2.1 Latched Window-Style Comparison Mode
        2. 8.4.2.2 Transparent Hysteresis-Style Comparison Mode
        3. 8.4.2.3 End-of-Conversion Mode
        4. 8.4.2.4 End-of-Conversion and Transparent Hysteresis-Style Comparison Mode
    5. 8.5 Programming
      1. 8.5.1 Writing and Reading
        1. 8.5.1.1 High-Speed I2C Mode
        2. 8.5.1.2 General-Call Reset Command
        3. 8.5.1.3 SMBus Alert Response
    6. 8.6 Register Maps
      1. 8.6.1 Internal Registers
        1. 8.6.1.1 Register Descriptions
          1. 8.6.1.1.1 Result Register (offset = 00h)
          2. 8.6.1.1.2 Configuration Register (offset = 01h) [reset = C810h]
          3. 8.6.1.1.3 Low-Limit Register (offset = 02h) [reset = C0000h]
          4. 8.6.1.1.4 High-Limit Register (offset = 03h) [reset = BFFFh]
          5. 8.6.1.1.5 Manufacturer ID Register (offset = 7Eh) [reset = 5449h]
          6. 8.6.1.1.6 Device ID Register (offset = 7Fh) [reset = 3001h]
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Electrical Interface
      2. 9.1.2 Optical Interface
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Optomechanical Design
        2. 9.2.2.2 Dark Window Selection and Compensation
      3. 9.2.3 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
      4. 9.5.4 Mechanical Drawings
  10. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 接收文档更新通知
    3. 10.3 支持资源
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 术语表
  11. 11Mechanical, Packaging, and Orderable Information

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8.1 Overview

The OPT3005 measures the ambient light that illuminates the device. This device measures light with a spectral response very closely matched to the human eye along with extreme 850 nm and 940 nm 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 human lighting experiences. Extreme rejection of infrared light, which a human does not see, is a crucial component of this matching, especially when operation in intended underneath windows that are visibly dark, but infrared transmissive. Systems with 850nm or 940nm active NIR illumination especially benefit from the IR rejection to measure the ambient light resilient to the stray NIR light reflected by the cover glass.

The OPT3005 is fully self-contained to measure the ambient light and report the result in 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 window comparison and communicated with the INT pin.

The OPT3005 can be configured into an automatic full-scale, range-setting mode that always selects the best full-scale range setting for the lighting conditions. This mode frees the user from having to program their software for potential iterative cycles of measurement and readjustment of the full-scale range until optimal for any given measurement. The device can be commanded to operate continuously or in single-shot measurement modes.

The device integrates the result over either 100 ms or 800 ms, so the effects of 50-Hz and 60-Hz noise sources from typical light bulbs are nominally reduced to a minimum.

The device starts up in a low-power shutdown state, such that the OPT3005 only consumes active-operation power after being programmed into an active state.

The OPT3005 optical filtering system is not excessively sensitive to non-designed for 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.