INTRODUCTION

ST7577 is a driver & controller LSI for graphic dot-matrix liquid crystal display systems. ST7577 contains 132 segment and 39 common driver circuits. This chip is connected directly to a microprocessor, accepts 3-line, 4-line serial peripheral interface (SPI) or 8-bit parallel interface, display data can stores in an on-chip Display Data RAM (DDRAM) of 132 x 39 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

● 132 segments / 39 commons (DTY=”L”)

● 132 segments / 12 commons (DTY=”H”)

On-chip Display Data RAM (DDRAM)

● Capacity: 132X39=5148 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

On-chip Low Power Analog Circuit

● Embedded Boosters with voltage regulation function that generates high-accuracy voltage (externally V0I / XV0I voltage supply is also supported).

● Voltage regulation temperature gradient -0.07/°C

● Programmable Booster stages: X3,X4.

● On-chip electronic contrast control function

● Built-in Voltage Follower generates LCD bias voltages (1/4 to 1/7).

Built-in oscillator

● Built-in oscillator requires no external components (external clock input is also supported)

External RESB (reset) pin

Supply voltage range

● VDD - VSS (Digital): 2.4 to 3.3V (typical);

● VDD2 - VSS (Analog): 2.4 to 3.3V (typical).

Display supply voltage (V0-VSS) range: 3.0V~8.31V

Temperature range: -30 to +85 degree

Support LCD Module Size up to 1.4”