1. INTRODUCTION

The ST7637 is a driver & controller LSI for 65K color graphic dot-matrix liquid crystal display systems. It generates 396 Segment and 132 Common driver circuits. This chip is connected directly to a microprocessor, accepts Serial Peripheral Interface (SPI) 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.

2. FEATURES

Driver Output Circuits

♦ 396 segment outputs / 132 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: 132 x 132 x 16 =278,784 bits

Color support by Interface

♦ 256 colors (RGB)=(332) mode

♦ 4k colors (RGB)=(444) mode

♦ 65K colors (RGB)=(565) mode

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

♦ Truncated 16M colors (RGB)=(888) mode

Microprocessor Interface

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

♦ 4-line serial interface

♦ 3-line (9-bits) serial interface

On-chip Low Power Analog Circuit

♦ On-chip oscillator circuit

♦ Voltage converter (x2~x8) with internal capacitors.

♦ Extremely Few Outsider Components. (3 Capacitors)

♦ On-chip Voltage Regulator

♦ On-chip electronic contrast control function

♦ Voltage follower (LCD bias: 1/5~1/12) Operating Voltage Range

♦ Supply Digital Voltage (VDD, VDD1): 1.65 to 3.0V

♦ Supply Analog Voltage (VDD2~VDD5): 2.4 to 3.3V

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

♦ Contrast Adjustment Value is stored in the Built-In OTP-ROM for better display quality. LCD Driving setting suggestion

♦ VOP = 14V, BIAS=1/9. (VDD=2.8V)

♦ VOP=15.5V,BIAS=1/10. (VDD=2.8V)

Package Type

♦ Application for COG