INTRODUCTION
The ST7549T is a driver & controller LSI for graphic dot-matrix liquid crystal display systems. It contains 102 segment and 67 common with 1 ICON driver circuits. This chip is connected directly to a microprocessor, accepts 3-line or 4-line serial peripheral interface (SPI), I2C interface or 8-bit parallel interface, display data can stores in an on-chip display data RAM of 68 x 102 bits. 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 to drive liquid crystal, it is possible to make a display system with the fewest components.

FEATURES
Single-chip LCD controller & driver

Driver Output Circuits
102 segment / 67 common+1 ICON common (1/68 duty)
102 segment / 32 common+1 ICON common (1/33 duty)
102 segment / 16 common+1 ICON common (1/17 duty)
(1/33 duty and 1/17 duty are under partial screen mode)

On-chip Display Data Ram
■ Capacity: 68X102=6,936 bits Microprocessor Interface
■ 8-bit parallel bi-directional interface with 6800-series or 8080-series
■ 4-line SPI (serial peripheral interface) available (only write operation)
■ 3-line SPI (serial peripheral interface) available
■ I2C (Inter-Integrated Circuit) Interface

On-chip Low Power Analog Circuit
■ Generation of LCD supply voltage (externally VOUT voltage supply is possible)
■ Generation of intermediate LCD bias voltages
■ Oscillator without external components (external clock also possible)
■ Voltage Booster (X2,X3,X4,X5)
■ Voltage Regulator (temperature gradient -0.11%/°C)
■ Voltage Follower
■ On-chip electronic contrast control function (255 steps)

External RESB (reset) pin
Supply voltage range
■ VDD1 -VSS : 1.7 to 3.3V
■ VDD2 -VSS : 2.4 to 3.3V
■ VOUT -VSS : 13.5V (Max.)
Temperature range: -30 to +85 degree Package Type: COG