ST
Sitronix
INTRODUCTION
drive liquid crystal, it is possible to make a display system with the fewest components.
ST7541
4 Gray Scale Dot Matrix LCD Controller/Driver
ST7541 is a driver & controller LSI for 4-level gray scale graphic dot-matrix liquid crystal display systems. This chip can
connect directly to a microprocessor which supports: Serial Peripheral Interface (SPI), IIC or 8-bit parallel interface. Display
data stores in an on-chip display data RAM of 128 x 129 x 2 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 necessary to
FEATURES
4-level Gray Scale
–
Display with PWM and FRC Methods
DDRAM Data [2n:2n+1]
2n
0
0
1
1
(Accessible column address, n = 0~127)
2n + 1
0
1
0
1
Gray Scale
White
Light gray
Dark gray
Black
Driver Output Circuits
128 segment outputs / 128+1 common outputs
On-chip Low Power Analog Circuit
–
On-chip oscillator circuit
–
Voltage booster (x3, x4, x5 or x6)
–
Voltage regulator (temperature coefficient: -0.144%/˚C, or
external input)
–
On-chip electronic contrast control function (64 steps X 8)
–
Voltage follower (LCD bias : 1/5 to 1/12)
Applicable Duty Ratios
–
Various partial display
–
Partial window moving & data scrolling
On-chip Display Data RAM
–
Capacity: 128
×
129
×
2= 33,024 bits
Microprocessor Interface
–
8-bit bi-directional parallel interface supports 6800-series
or 8080-series MPU
–
4-line serial interface (4-Line SPI)
–
3-line serial interface (3-Line 8-bit SPI)
–
IIC serial interface
Operating Voltage Range
–
Supply voltage (VDD): 1.8 to 3.3V
–
Supply voltage (VDD2): 2.4 to 3.3V
–
LCD driving voltage (VLCD = V0 - VSS): 3.5 to 15.0 V
Package Type
–
Application for COG
ST7541
ST7541i
6800 , 8080 ,
4-Line , 3-Line interface
(without IIC interface)
IIC interface
Sitronix Technology Corp. reserves the right to change the contents in this document without prior notice.
Ver 1.9
1/78
2007/9/3
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
