ST7556

ST Sitronix 1. INTRODUCTION ST7556 65 x 102 Dot Matrix LCD Controller/Driver The ST7556 is a driver & controller LSI for graphic dot-matrix liquid crystal display systems. It contains 102 segment and 65 common with 1 ICOM driver circuits. This chip is connected directly to a microprocessor, accepts 4-line serial interface (SPI) or 8-bit parallel interface, display data can store 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. 2. FEATURES Driver Output Circuits 102 segment outputs / 65+1 common outputs On-chip Display Data ram Capacity: 66X102=6,732 bits (external clock also possible) Voltage converter (x4) Voltage regulator (temperature gradient -0.05%/°C) Voltage follower On-chip electronic contrast control function (128 steps) Liquid crystal driving voltage : V0 -VSS = max 12 V (external power supply) Microprocessor Interface 8-bit parallel bi-directional interface with 6800-series or 8080-series 4-line SPI (serial peripheral interface) available (only write operation) On-chip Low Power Analog Circuit Generation of LCD supply voltage (externally Vout voltage supply is possible) Generation of intermediate LCD bias voltages External RESB (reset) pin Logic supply voltage range VDD -VSS 1.8 to 3.3V Temperature ra...