SBASA67 June   2023 OPT4060

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Description (continued)
  7. 6 Pin Configuration and Functions
  8. 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
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Infrared Light Rejection
      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. 8.4 Device Functional Modes
      1. 8.4.1 Modes of Operation
      2. 8.4.2 Interrupt Modes of Operation
      3. 8.4.3 Light Range Selection
      4. 8.4.4 Selecting Conversion Time
      5. 8.4.5 Light and Color Measurement
        1. 8.4.5.1 Determining ADC Codes for Each Channel
        2. 8.4.5.2 Lux and Color Calculations
        3. 8.4.5.3 Threshold Detection Calculations
      6. 8.4.6 Light Resolution
    5. 8.5 Programming
      1. 8.5.1 I2C Bus Overview
        1. 8.5.1.1 Serial Bus Address
        2. 8.5.1.2 Serial Interface
      2. 8.5.2 Writing and Reading
        1. 8.5.2.1 High-Speed I2C Mode
        2. 8.5.2.2 Burst Read Mode
        3. 8.5.2.3 General-Call Reset Command
        4. 8.5.2.4 SMBus Alert Response
    6. 8.6 Register Maps
      1. 8.6.1 Register Map
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Electrical Interface
        1. 9.2.1.1 Design Requirements
          1. 9.2.1.1.1 Optical Interface
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Optomechanical Design
        3. 9.2.1.3 Application Curve
    3. 9.3 Best Design Practices
    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
  11. 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
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.4.5.1 Determining ADC Codes for Each Channel

Data for each channel is given as exponent and mantissa components by the sensor. Raw ADC_CODES corresponding to the intensity measured on each channel is determined using the following equations. First the mantissa component is calculated from the MSB and LSB registers.

Equation 12. MANTISSA_CHx = (RESULT_MSB_CHx<<8) + RESULT_LSB_CHx

or

Equation 13. MANTISSA_CHx = (RESULT_MSB_CHx × 28) + RESULT_LSB_CHx

where

  • RESULT_MSB_CHx, RESULT_LSB_CHx and EXPONENT_CHx are registers part of the output register for each channel

The RESULT_MSB_CHx register carries the most significant 12 bits of the MANTISSA_CHx, and RESULT_LSB_CHx register carries the least significant eight bits of the MANTISSA_CHx. The MANTISSA_CHx is then computed using the above equations to get the 20-bit number. The EXPONENT_CHx is directly read from the register, which is four bits.

After the EXPONENT_CHx and MANTISSA_CHx portions are calculated, use the following equations to calculate the linearized ADC_CODES_CHx:

Equation 3. ADC_CODES_CHx = (MANTISSA_CHx<<EXPONENT_CHx)

or

Equation 4. ADC_CODES_CHx = (MANTISSA_CHx × 2EXPONENT_CHx)

The maximum value for register EXPONENT_CHx is 6, therefore ADC_CODES is effectively a 26-bit number. The semi-logarithmic numbers have been converted to a linear ADC_CODES_CHx representation making simple to convert to lux and RGB color coordinates.