SNVU731 November   2020 LP8864-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Test Setup
    1. 2.1 LP8864EVM Kit
    2. 2.2 System and Equipment Requirements
    3. 2.3 Hardware Setup
    4. 2.4 Software Installation
    5. 2.5 Quick Start-Up Procedure
    6. 2.6 Additional GUI Functions
      1. 2.6.1 Monitor Faults Page
      2. 2.6.2 Diagnostics Page
      3. 2.6.3 Register Map Page
    7. 2.7 Instructions for Standalone Evaluation
  4. 3LP8864EVM Board Layout
  5. 4LP8864EVM Schematic
  6. 5 LP8864EVM Bill of Materials
  7. 6LED Load Board

2.6.2 Diagnostics Page

From the Diagnostics page (see Figure 2-7), the user can read back the following diagnostics register values and corresponding device status.

  • FSM_LIVE_STATUS: current status of the functional state machine
  • PWM_INPUT_STATUS: 16-bit value for detected duty cycle of PWM input signal
  • PWM_OUTPUT_STATUS: 16-bit value for configured duty cycle of PWM output signal
  • LED_CURRENT_STATUS: 12-bit current DAC code that brightness path is driving to OUT1-4 output
  • VBOOST_STATUS: 11-bit boost voltage code that adaptive voltage control loop sending to analog boost block
  • AUTO_PWM_FREQ_SEL: LED PWM frequency value from PWM_SEL resistor detection
  • AUTO_LED_STRING_CFG: LED string configuration from LED_SET resistor detection
  • AUTO_BOOST_FREQ_SEL: boost switching frequency value from PWM_FSET resistor detection
  • MODE_SEL: LED dimming mode value from MODE resistor detection
GUID-20201026-CA0I-1LM4-JJKJ-TF7P5RHGJXND-low.pngFigure 2-7 LP8864VM Diagnostics Page