ST7556 Datasheet, PDF (1/43 Pages) Sitronix Technology Co., Ltd. – 65 x 102 Dot Matrix LCD Controller/Driver

ST
Sitronix
ST7556
65 x 102 Dot Matrix LCD Controller/Driver
1. INTRODUCTION
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
(external clock also possible)
102 segment outputs / 65+1 common outputs
- Voltage converter (x4)
On-chip Display Data ram
- Voltage regulator (temperature gradient
- Capacity: 66X102=6,732 bits
-0.05%/°C)
Microprocessor Interface
- Voltage follower
- 8-bit parallel bi-directional interface with
- On-chip electronic contrast control function (128
6800-series or 8080-series
steps)
- 4-line SPI (serial peripheral interface) available
- Liquid crystal driving voltage :
(only write operation)
V0 -VSS = max 12 V (external power supply)
On-chip Low Power Analog Circuit
- Generation of LCD supply voltage (externally
External RESB (reset) pin
Vout voltage supply is possible)
Logic supply voltage range VDD -VSS
- Generation of intermediate LCD bias voltages
- 1.8 to 3.3V
Temperature range: -30 to +85 degree
- Oscillator requires no external components
Ver 2.2
1/43
2005/10/05