INTRODUCTION

The S6B1741 is a driver & controller LSI for 4-level gray scale graphic dot-matrix liquid crystal display systems. It contains 128 segment and 129 common driver circuits. This chip is connected directly to a microprocessor, accepts Serial Peripheral Interface (SPI) or 8-bit parallel display data and stores in an on-chip display data RAM of 128 x 129 x 2 bits. It performs display data RAM read/write operation with no 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

4-level (White, Light Gray, Dark Gray, Black) Gray Scale Display with PWM and FRC Methods

Driver Output Circuits

— 128 segment outputs/129 common outputs

Applicable Duty Ratios

— Various partial displays

— Partial window moving & data scrolling

On-chip Display Data RAM

— Capacity: 129 ´ 128 ´ 2 = 33,024bits

Microprocessor Interface

— 8-bit parallel bi-directional interface with 6800-series or 8080-series

— SPI (serial peripheral interface) available (only write operation)

On-chip Low Power Analog Circuit

— On-chip oscillator circuit

— Voltage converter (x3, x4, ´5 or x6)

— Voltage regulator (temperature coefficient: -0.125/°C, or external input)

— On-chip electronic contrast control function (64 steps)

— Voltage follower (LCD bias: 1/5 to 1/12)

Operating Voltage Range

— Supply voltage (VDD): 1.8 to 3.3V

— LCD driving voltage (VLCD = V0 - VSS): 4.0 to 15.0 V

Low Power Consumption

— 300 μA Max. (operation)

— 2 μA Max. (sleep mode)

Package Type

— Slim chip for TCP