SNVSCQ2A March   2025  – August 2025 LP5817

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Dimming
      2. 7.3.2 PWM Dimming
      3. 7.3.3 Sloper
      4. 7.3.4 Protections
        1. 7.3.4.1 UVLO
        2. 7.3.4.2 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Initialization Mode
      2. 7.4.2 Standby and Normal Mode
      3. 7.4.3 Shutdown Mode
      4. 7.4.4 Thermal Shutdown Mode
    5. 7.5 Programming
      1. 7.5.1 I2C Data Tansactions
      2. 7.5.2 I2C Data Format
      3. 7.5.3 Command Description
    6. 7.6 Register Maps
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application
      2. 8.2.2 Design Parameters
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Program Procedure
        2. 8.2.3.2 Programming Example
      4. 8.2.4 Application Performance Plots
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
    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

8.2.3.2 Programming Example

To get the design parameters in Section 8.2.2, the following program steps can be referred.

After VCC powering up and wait around 1ms,

  1. Set CHIP_EN = 1 to enable the device(Write 01h to register 00h)
  2. Set MAX_CURRENT = 1h to set 51mA maximum output LED current (Write 01h to register 01h)
  3. Set 51mA maximum current for red LEDs, 40.8mA maximum current for green and blue LEDs (Write FFh to registers 14h, write CCh to registers 15h and 16h)
  4. Enable all 3 LEDs (Write 07h to register 02h)
  5. Send UPDATE_CMD to make above step2 and step4 configurations take effect (Write 55h to register 0Fh)
  6. Set red, green and blue LEDs PWM duty cycle as 100%, 80% and 40% (Write FFh to register 18h, write CCh to register 19h, write 66h to register 1Ah)

After this step, the red, green and blue LEDs are turned on with 100%, 80% and 40% PWM duty cycle.