INTRODUCTION

The ST7689 is a driver & controller LSI for 65K color graphic dot-matrix liquid crystal display systems. It generates 384 segments and 160 commons driver circuits. This chip is connected directly to a microprocessor, accepts Serial Peripheral Interface or 8-bit/16-bit parallel display data and stores in an on-chip display data RAM. 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

Driver Output Circuits

♦ 384 segment outputs / 160 common outputs

Applicable Duty Ratios

♦ Various partial display

♦ Partial window moving & data scrolling

Gray-Scale Display

♦ 4FRC & 31 PWM function circuit to display 64 gray-scale display

♦ Support 8 color mode (Idle mode)

On-chip Display Data RAM

♦ Capacity: 128 x 160 x 16 = 327,680 bits

Color support by Interface

♦ 256 color mode(RGB)=(332) mode

♦ 4k colors (RGB)=(444) mode

♦ 65K colors (RGB)=(565) mode

♦ 262K colors (RGB)=(666) mode (truncate)

Microprocessor Interface

♦ 8/16-bit parallel bi-directional interface with 6800-series or 8080-series

♦ 3-line (9-bits) , 4-line(8-bits) serial interface

On-chip Low Power Analog Circuit

♦ On-chip oscillator circuit and voltage regulator

♦ Voltage converter (x5, x6, x7, x8) with internal booster capacitors.

♦ Extremely few outsider components. (Required outsider components: 4 Capacitors)

♦ On-chip electronic contrast control function

♦ Voltage follower

(LCD bias: 1/9, 1/10, 1/11, 1/12, 1/13, 1/14)

Operating Voltage Range

♦ Supply Digital Voltage -> VDDI (VDD) = 1.65~3.3V

♦ Supply Analog Voltage -> VDDA (VDD1, VDD2, VDD3, VDD4, VDD5) = 2.4~3.3V

♦ LCD driving voltage (VOP = V0 - VSS): Max: 18V

LCD Driving Voltage (PROM)

♦ Contrast Adjustment Value is stored in the built-in PROM (Programmable ROM) for better display quality

LCD Driving Setting Suggestion

♦ Vop=15~16V. Bias=1/9~1/11

Package Type

♦ Application for COG