INTRODUCTION

The ST7546T is a driver & controller LSI for graphic dot-matrix liquid crystal display systems. It contains 102 segment and 65 common with 1 ICON driver circuits. This chip is connected directly to a microprocessor, accepts 8-bit parallel interface、3-line or 4-line serial peripheral interface (SPI)、I2C 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

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 (externally Vout voltage supply is possible)

- Generation of intermediate LCD bias voltages

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

- Voltage converter (x4, x5)

- Voltage regulator(temperature gradient -0.11/°C)

- Voltage follower

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

External RESB (reset) pin

Logic supply voltage range VDD1,2 -VSS

- VDD1 -VSS : 1.7 to 3.3V

- VDD2 -VSS : 2.4 to 3.3V

Display supply voltage range VLCD -VSS

- 4.5 to 13.5V

Temperature range: -40 to +85 degree