ST7549T

Sitronix 1. INTRODUCTION ST ST7549T 68 x 102 Dot Matrix LCD Controller/Driver 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. 2. 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 n n n n n n Capacity: 68X102=6,936 bits 8-bit parallel bi-directional interface with n n Microprocessor Interface 6800-series or 8080-series 4-line SPI (serial peripheral interface) available (only write operation) 3-line SPI (serial peripheral interface) available I2 C (Inter-Integrated Circuit) Interface n n n n voltage supply is possible) Generation of intermediate LCD bias voltages Oscillator without external components (external clock also possible) Volt...