SBOSA93C May   2023  – June 2024 OPT4001-Q1

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 Timing Requirements
    7. 5.7 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 Matching to Human Eye
      2. 6.3.2 Automatic Full-Scale Range Setting
      3. 6.3.3 Error Correction Code (ECC) Features
        1. 6.3.3.1 Output Sample Counter
        2. 6.3.3.2 Output CRC
      4. 6.3.4 Output Register FIFO
      5. 6.3.5 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
        4. 6.5.2.4 SMBus Alert Response (USON Variant)
  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 (PicoStar Variant)
          2. 8.2.1.2.2 Optomechanical Design (USON Variant)
        3. 8.2.1.3 Application Curves (PicoStar Variant)
        4. 8.2.1.4 Application Curves (USON Variant)
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Soldering and Handling Recommendations (PicoStar Variant)
          1. 8.5.1.1.1 Solder Paste
          2. 8.5.1.1.2 Package Placement
          3. 8.5.1.1.3 Reflow Profile
          4. 8.5.1.1.4 Special Flexible Printed-Circuit Board (FPCB) Recommendations
          5. 8.5.1.1.5 Rework Process
        2. 8.5.1.2 Soldering and Handling Recommendations (USON Variant)
      2. 8.5.2 Layout Example
  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

6.1 Overview

The OPT4001-Q1 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 strong near-infrared rejection.

Matching the sensor spectral response to that of the human eye response is vital because ambient light sensors measure and help create 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 OPT4001-Q1 especially good for operation underneath windows that are visibly dark, but infrared transmissive.

The OPT4001-Q1 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 (with the USON package variant). The result can also be summarized with a programmable threshold comparison and communicated with the INT pin (with the USON package variant).

The OPT4001-Q1 is by default configured to operate in automatic, full-scale range detection mode that always selects the best full-scale range setting for the given lighting conditions. There are nine 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 programing software for multiple iterations of measurement and readjustment of the full-scale range until reaching acceptable results for any given measurement. With the device exhibiting excellent linearity over the entire 28-bit dynamic range of measurement, no additional linearity calibration is required at the system level.

The OPT4001-Q1 can be configured to operate in continuous or one-shot measurement mode. The device offers 12 conversion times ranging from 600 μs to 800 ms. The device starts up in a low-power shutdown state, such that the OPT4001-Q1 only consumes active-operation power when the device is programmed into an active state.

The OPT4001-Q1 optical filtering system is not excessively sensitive to small 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. Always follow proper optical surface cleanliness for best results on all optical devices.