INTRODUCTION

The ST7624 is a driver & controller LSI for 65k color graphic dot-matrix liquid crystal display systems. It generates 312 Segment and 104 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

? 312 segment outputs / 104 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.

On-chip Display Data RAM

? Capacity: 104X104X?16 =173,056bits

? 65K colors (RGB)=(565) mode

? Dithered262k colors (RGB)=(666) mode

? Dithered 16M colors (RGB)=(888) mode

Microprocessor Interface

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

? 4-line serial interface (4-line-SIF)

? 3-line serial interface (3-line-SIF)

On-chip Low Power Analog Circuit

? On-chip oscillator circuit

? Voltage converter (x2, x3, x4, x5, x6, x7, x8)

? Voltage regulator(Temperature gradient= -0.119/°C +-10)

? On-chip electronic contrast control function

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

Operating Voltage Range

? Supply voltage (VDD, VDD1): 2.4 to 3.3V (VDD2, VDD3, VDD4, VDD5): 2.4 to 3.3V

? LCD driving voltage (VOP = V0 - VSS): 3.76 to 18.0 V

? Suggested value of V0 is 12V~15V , bias =1/11

LCD driving voltage (EEPROM)

? To store contrast adjustment value for better display

Package Type

? Application for COG