
128SEG/129COM DRIVER & CONTROLLER FOR STN LCD
S6B1741
1
INTRODUCTION
The S6B1741 is a driver & controller LSI for 4-level gray scale graphic dot-matrix liquid crystal display systems. It
contains 128 segment and 129 common driver circuits. This chip is connected directly to a microprocessor, accepts
Serial Peripheral Interface (SPI) or 8-bit parallel display data and 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 drive liquid crystal, it is possible to
make a display system with the fewest components.
FEATURES
4-level (White, Light Gray, Dark Gray, Black) Gray Scale Display with PWM and FRC Methods
DDRAM data [2n: 2n+1]
Gray scale
(Accessible column address, n = 0, 1, 2,
……
, 125, 126, 127)
00
01
10
11
Dark
White
Light gray
Dark gray
Driver Output Circuits
—
128 segment outputs/129 common outputs
Applicable Duty Ratios
Duty Ratio
Applicable LCD Bias
1/5 to 1/12
Maximum Display Area
129
×
128
1/16 - 1/128 (ICON disabled)
1/17 - 1/129 (ICON enabled)
Various partial displays
Partial window moving & data scrolling
—
—
On-chip Display Data RAM
—
Capacity: 129
×
128
×
2 = 33,024bits
Microprocessor Interface
—
8-bit parallel bi-directional interface with 6800-series or 8080-series
—
SPI (serial peripheral interface) available (only write operation)
On-chip Low Power Analog Circuit
—
On-chip oscillator circuit
—
Voltage converter (x3, x4,
×
5 or x6)
—
Voltage regulator (temperature coefficient: -0.125%/
°
C, or external input)
—
On-chip electronic contrast control function (64 steps)
—
Voltage follower (LCD bias: 1/5 to 1/12)
Operating Voltage Range
—
Supply voltage (V
DD
): 1.8 to 3.3V
—
LCD driving voltage (V
LCD
= V0 - V
SS
): 4.0 to 15.0 V
Low Power Consumption
—
300
μ
A Max. (operation)
—
2
μ
A Max. (sleep mode)
Package Type
—
Slim chip for TCP