SED1540
CMOS DOT MATRIX LCD CONTROLLER/DRIVER
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DESCRIPTION
The SED1540 is an LCD driver-controller intended mainly for segment type liquid crystal displays. The
device communicates with a host microprocessor through an 8-bit parallel data. The SED1540 stores
the data that is sent from the microcomputer in the built-in data display RAM, and generates a liquid
drive signal.
The device is manufactured with a low power consumption CMOS process. These features give the designer
a flexible means of implementing a small to medium size LCD display for a compact, low power system.
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FEATURES
•
Low-power CMOS technology
•
Fast CPU 8-bit data interface (80xx, 68xx)
•
1/4 duty cycle
segments
•
Built-in LCD driver circuit .............. 73 commons
4
•
Built-in display data RAM ................... 2560 bits
•
Rich display command setting
•
On-chip CR oscillation circuit
Clock Source
External clock
Internal osc.
f
CL
4 kHz
18 kHz
Frame Frequency
85/64 Hz
375/281 Hz
•
Master/slave operation is supported
•
Recommended expansion driver ........ SED1521
(80-segment driver)
•
Low power consumption ................... 30µW max
•
LCD voltage ....................................... 3.5 to 11V
•
Single power supply ......................... 2.4 to 7.0V
pin (F
•
Package ............................. QFP5-100pad (D ))
Al
OA
OA
Au bump (D
OB
)
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SYSTEM BLOCK DIAGRAM
COM0~COM3
73 SEG
×
4 COM
SEG0~SEG72
RES
CPU
80xx
68xx
CS
D0 ~ D7
SED1540
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