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