INTRODUCTION

ST7586S is a driver & controller LSI for 4-level gray scale graphic dot-matrix liquid crystal display systems. It contains 384-segment and 160-common driver circuits. This chip can be connected directly to a microprocessor which accepts 8-bit parallel interface (8080-series or 6800-series type), 4-Line serial interface or 3-Line serial interface. Display data is stored into an on-chip Display Data RAM (DDRAM). It performs the Display Data RAM read/write operation without external operating clock, and the power consumption can be minimized. In addition, since all necessary power supply circuits for LCD system are built-in, ST7586S constructs a LCD display system with the fewest components.

FEATURES

Single-chip LCD controller/driver

Driver Output Circuits

  ♦ 384 segment outputs / 160 common outputs

On-chip Display Data RAM

  ♦ Capacity: 384 x 160 x 2 = 122,880 bits

Various Partial Display Features

  ♦ Applicable partial duty

  ♦ Partial window moving & data scrolling

Microprocessor Interface

  ♦ 8-bit parallel bi-directional interface supports 6800-series or 8080-series MPU

  ♦ 4-Line serial interface

  ♦ 3-Line (9-bit) serial interface

On-chip Low Power Analog Circuit

  ♦ On-chip oscillator circuit

  ♦ Voltage booster with built-in boost-capacitors

  ♦ Extremely few external components: 4 capacitors

  ♦ Built-in voltage regulator with programmable contrast

  ♦ Built-in voltage follower supports LCD bias voltage Available bias: 1/9 ~ 1/14

Operating Voltage Range

  ♦ Digital Power (VDD1): 1.8V ~ 3.3V (TYP.)

  ♦ Analog Power (VDD2~VDD5, VDDX):  2.8V ~ 3.3V (TYP.)

  ♦ LCD operation voltage (Vop = V0-XV0) : 18V