INTRODUCTION

The ST7625 is a driver & controller LSI for 65K color graphic dot-matrix liquid crystal display systems. It generates 306 Segment and 96 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.

FEATURES

Driver Output Circuits

♦ 306 Segment Outputs / 96 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: 102 x 96 x 16 =156,672 bits

Color support by Interface

♦ 256 color mode, (RGB)=(332) mode

♦ 4K color mode, (RGB)=(444) mode

♦ 65K color mode, (RGB)=(565) mode

♦ Truncated 262K color mode, (RGB)=(666) mode

♦ Truncated 16M color mode, (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

♦ On-chip Voltage Converter (x2, x3, x4, x5, x6, x7, X8) with internal booster capacitors.

♦ Extremely Few Outsider Components. (Required outsider components: Three 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, VDD3, VDD4, VDD5): 2.4 to 3.3V

♦ LCD Driving Voltage (VOP = V0 - VSS): Max to 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 = 11V, BIAS=1/9. (VDD=2.8V)

Package Type

♦ Application for COG