SNVSD24 August   2025 LP5814I

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 Autonomous Animation Control
        1. 7.3.4.1 Animation Engine Unit
        2. 7.3.4.2 Animation Pattern Unit
        3. 7.3.4.3 Animation Control
      5. 7.3.5 Instant Blinking
      6. 7.3.6 Protections
        1. 7.3.6.1 UVLO
        2. 7.3.6.2 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Initialization Mode
      2. 7.4.2 Instant Blinking Mode
      3. 7.4.3 Standby and Normal Mode
      4. 7.4.4 Shutdown Mode
      5. 7.4.5 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
    1. 11.1 Mechanical Data

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7.3.1 Analog Dimming

There are two methods to control the current gain of each output channel.

  • Global 1-bit Maximum Current (MC) control for all channels without external resistor
  • Individual 8-bit Dot Current (DC) control for each channel

The maximum output current IOUT_max of each channel can be programmed by the 1 bit MAX_CURRENT. When the device is powered on, the default value of MC is 0h, which is 25.5mA.

Table 7-1 Maximum Current (MC) Bit Setting
1-bit Maximum Current (MC) IOUT_MAX (mA)
Binary Decimal
0 (default) 0 (default) 25.5 (default)
1 1 51

The LP5814I can individually adjust the analog output current of each channel by using Dot Current (DC) function. The brightness deviation among the LED bins can be minimized to achieve uniform display performance through the DC setting. The DC is programmed in an 8-bit depth, so the analog current can be adjusted with 256 steps from 0 to 100% of IOUT_MAX.. The default value of all DC is 0h, which is not current output.

Table 7-2 Dot Current (DC) Bits Setting
8-bits Dot Current (DC) Register Ratio of IOUT_MAX
Binary Decimal
0000 0000 (default) 0 (default) 0% (default)
0000 0001 1 0.39%
0000 0010 2 0.78%
--- --- ---
1000 0000 128 50.2%
--- --- ---
1111 1101 253 99.2%
1111 1110 254 99.6%
1111 1111 255 100%

By configuring the MC and DC, the analog output current of each channel can be calculated as Equation 1:

Equation 1. I O U T   ( m A ) = I O U T _ M A X × D C 255

The average output current of each channel can be calculated as Equation 2:

Equation 2. I A V E   ( m A ) = I O U T _ M A X × D C 255 × D P W M

  • DPWM is the PWM duty.