SLAU781 August   2018

 

  1.   KDK350ADPTR-EVM
    1.     Trademarks
    2. 1 Board Overview
      1. 1.1 Using the KDK350ADPTR-EVM
    3. 2 KDK350ADPTR-EVM Pinouts and Features
      1. 2.1 LCD EVM Interface Header
      2. 2.2 LCD Backlight Control
      3. 2.3 LCD Interface Control
    4. 3 Software Development
      1. 3.1 Software Description
      2. 3.2 Source Code
      3. 3.3 Tool Options
    5. 4 REACH Compliance
    6. 5 Schematics

2.2 LCD Backlight Control

The K350QVG-V2-F-04 LCD provides backlighting through six LEDs in a serial configuration which requires 19.2 V at 20 mA for full brightness. The backlight voltage is generated using a TI TPS61042 Switch Boost Converter. The TPS61042 allows PWM control over the backlight to adjust brightness using the Backlight PWM pin on J1 (pin 32). For full brightness, a logic "high" signal is applied to the Backlight PWM pin. For reduced brightness, a PWM signal between 100 Hz and 50 kHz is applied.