Introduction

The ST7715 is a single-chip controller/driver for 262K-color, graphic type TFT-LCD. It consists of 396 source line and 132 gate line driving circuits. This chip is capable of connecting directly to an external microprocessor, and accepts Serial Peripheral Interface (SPI), 8-bit/9-bit/16-bit/18-bit parallel interface. Display data can be stored in the on-chip display data RAM of 132 x 132 x 18 bits. It can perform display data RAM read/write operation with no external operation clock to minimize power consumption. In addition, because of the integrated power supply circuits necessary to drive liquid crystal, it is possible to make a display system with fewer components.

Features

Single chip TFT-LCD Controller/Driver with RAM

On-chip Display Data RAM (i.e. Frame Memory)

- 132 (H) x RGB x 132 (V) bits

LCD Driver Output Circuits:

- Source Outputs: 132 RGB channels

- Gate Outputs: 132 channels

Display Resolution

- 132 (RGB) x 132 (GM[2:0]= ”001”, DDRAM: 132 x 18-bits x 132)

Display Colors (Color Mode)

- Full Color: 262K, RGB=(666) max., Idle Mode OFF

- Color Reduce: 8-color, RGB=(111), Idle Mode ON

Programmable Pixel Color Format (Color Depth) for Various Display Data input Format

- 12-bit/pixel: RGB=(444) using the 384k-bit frame memory and LUT

- 16-bit/pixel: RGB=(565) using the 384k-bit frame memory and LUT

- 18-bit/pixel: RGB=(666) using the 384k-bit frame memory and LUT

Various Interfaces

- Parallel 8080-series MCU Interface (8-bit, 9-bit, 16-bit & 18-bit)

- 3-line serial interface

- 4-line serial interface