Introduction

The ST7712 is a single-chip which generates 396 Source lines and 132 gate lines controller/driver for 262K color TFT dot graphic display. ST7712 support 18-bit high-speed bus interface and Serial Peripheral Interface (SPI), thus it can perform bi-operation functions, data transfer, and high-speed RAM write function. Display data can be stored in an on-chip display data RAM of 132x396x6 bits. It can perform display data RAM read/write operation without external operating clock to minimize power consumption. In addition, because it contains power supply circuits necessary to drive liquid crystal, it is possible to make a display system with the fewest components.

Features

Driver Output Circuits

−396 source output

−132 gate output

On-chip Display Data RAM

−Capacity: 396 × 132 × 6 =313,632bits

−65K colors (RGB)= (565) mode

−262K colors (RGB)= (666) mode

Applicable Duty Ratios

- Various partial display

- Partial window moving & data scrolling

Microprocessor Interface

−8/9/16/18-bit parallel bi-directional interface with

−6800-series or 8080-series

−4-line serial interface

−3-line serial interface

On-chip Low Power Analog Circuit

−On-chip oscillator circuit

−Voltage converter generating liquid crystal driver up to 6-time scale

−Simultaneous availability of 262K color with γ-correction function

Operating Voltage Range

−Vcc: 2.4~3.3V (logic power supply)

−Vci: 2.5~3.3V (analog power supply)

−IOVcc: 1.8~3.3V (interface power supply)

−Source line voltage: DDVDH=4.5~6.0V

Package Type

−Application for COG