INTRODUCTION

The ST7576 is a driver & controller LSI for graphic dot-matrix liquid crystal display systems. It contains 102 segments and 65 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 66 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 / 65 common+1 ICON common (1/66 duty)

102 segment / 16 common+1 ICON common (1/17 duty)

(1/17 duty is under partial screen mode)

On-chip Display Data Ram

- Capacity: 66X102=6,732 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

- Generation of intermediate LCD bias voltages

- Oscillator requires no external components (external clock also possible)

- Voltage converter X4; X5

- Voltage follower

- On-chip electronic contrast control function (255 steps)

External RESB (reset) pin

Logic supply voltage range

- VDD1 -VSS : 1.8 to 3.3V

- VDD2 -VSS : 2.4 to 3.3V

Display supply voltage range (V0)

- Application Vop range: 4V-9.5V

- Programmable Max V0: 10.5V

Temperature range: -30 to +85 degree