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SED1278
CMOS DOT MATRIX LCD CONTROLLER DRIVER
I
DESCRIPTION
The SED1278 is a character LCD controller-driver, capable of driving displays as large as 2 lines of 8
characters (5
×
8 pixels), with minimum external components.
The SED1278 has an internal CGROM consisting of 240 characters (5
×
7) plus the underline cursor, JIS,
ASCII, and eight user-programmable characters in RAM.
The SED1278 has 40 segment output and 16 common output built-in. Thus, one chip is capable of displaying
up to 16 characters. The SED1278 can display one line of 48 characters using an SED1681F (80-bit output)
as an expansion segment driver.
The SED1278 is fabricated using a silicon gate CMOS technology process and features very low power
dissipation. This makes the device suitable for handheld and portable applications.
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FEATURES
Low-power CMOS technology
40 segment output
16 common output
Duty: 1/8 or 1/16 (set by command)
4/8-bit CPU data interface, TTL compatible
Two frame AC drive wave form
CGROM: .................................... 240 characters
CGRAM: ........................................ 8 characters
Display data RAM: ... 80
×
8 bits (80 characters)
Recommended expansion segment driver:
SED1181F
LA
(64 output)
SED1681F (80 output)
Built-in power on power-on reset
Built-in RC oscillator
Built-in LCD driver voltage-divider network
TTL compatible CPU interface
Supply voltage ................... Logic: 4.5V to 5.5V
Package:
QFP5-80 pins (F
0A
, F
0B
, F
0C
, F
0D
, F
0G
, F
0H
)
Al pad (D
0A
, D
0B
, D
0C
, D
0D
, D
0G
, D
0H
)
LCD: 3.5V to 5.5V
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SYSTEM BLOCK DIAGRAM
6
SED1278
20 CHAR
×
2 LINES
SED1181
CPU
DATA
CONTROL
XSCL, LP
D0
40 SEG
16 COM