ASTLC5506 - CONFIGURABLE ALL-IN-ONE CHIP FOR CONTROLLING AV-TYPE PANELS

The ASTLC5506A is a selectable 242, 274 or 290-channel gate driver with timing controller for AV type color TFT LCDs. It provides all control signals and analog data to analog source drivers and includes power management circuits.

The timing controller accepts different timings with PAL or NTSC standard and can provide timings for 8 horizontal resolutions. The digital 8-bit input data are converted into analog data (R, G and B) through a selectable gamma correction table (one linear or 3 gamma ROM are available).

A DC-DC PWM controller allows to generate the input voltage (PVDD1) of the analog power supply regulator AVDD (5V) and charge pump input voltage PVDD2 from the logic power supply (3V). The charge pump uses external capacitors to provide all power supplies for the gate driver and common voltage blocks. Finally, a second PWM controller is used for the panel backlight supply voltage generation.

The offset and the amplitude of the common signal VCOM can be adjusted.

The system is configured through a 3-wire serial interface.

• System-on-chip (SOC) for small size color AV TFT-LCDs, including:
  - Gate driver: 242, 274 or 290-outputs selectable
  - Timing controller supporting 8 different timings
  - 480, 528, 720, 960, 1152, 1200, 1440 and 1560 horizontal resolution timings
  - Integrated PLL for horizontal display adjustment
  - CCIR 656 interface compatible with ITU-R BT.656 recommendation
  - On screen display (OSD) interface
  - Contrast, brightness, hue and saturation color adjustment
  - RGB 8-bit DAC with 1 linear and 3 gamma ROM selection
  - DC-DC controller for analog input regulator and charge pump input power supply
  - DC-DC controller of back-light power supply
  - Charge pump for gate driver output: +12.5V/-12.5V
  - 3-wire serial interface for system configuration
  - Stand-by mode
• Analog supply voltage: 5.0V ~ 5.5V
• Digital supply voltage: 2.7 ~ 3.6V
• Operating frequency: 27MHz
• COG package