Specifications
EPSON 4–1
SED1220
SED1220
• Built-in CR oscillation circuit (C and R contained)
• Accepts external clock input
• High-speed MPU interface
Affords interface with both 68/80 system MPUs
Affords interface through 4 bits and 8 bits
• Affords serial interface
• Character font consists of 5 × 8 dots
• Duty ratio
1
1/26 (SED1220D
**
)
2
1/18 (SED1221D
**
, SED1222D
**
)
• Simplified command setting
• Built-in power circuit for driving liquid crystal
Power amplifier circuit, power regulation circuit and
voltage followers × 4
• Built-in electronic volume function
• Low power consumption
80 µA max. (In normal operation, including
operating current of the power
supply).
20 µA max. (In standby mode for displaying
static icon).
5 µA max. (In sleeping mode when display
is turned off).
• Power supply
V
DD - VSS –2.4 V ~ –3.6 V
V
DD - V5 –4.0 V ~ – 6.0 V
• Temperature range for wide range operation
Ta = –30 ~ 85°C
• CMOS process
• Shipping style
Chip (Al pad product) SED1222D
*
A
Chip (Au bump product) SED122
*
D
*
B
TCP SED122
*
T
**
• This unit does not employ radiation protection design
OVERVIEW
SED1220 is a dot matrix LCD controller/driver for
character display. Using 4bits data, 8bits data or serial
data being provided from the micro computer, it displays
up to 36 characters, 4 user defined characters and up to
120 symbols.
Up to 256 types of built-in character generator ROMs are
prepared. Each character font is consisted of 5 × 8 dots.
It also contains the RAM for displaying 4 user defined
characters each font consisting of 5 × 8 dots. It is symbol
register allows character display with high degree of
freedom. This handy equipment can be operated with
minimum power consumption with its low power
consumption design, standby and sleeping mode.
FEATURES
• Built-in data display RAM – 36 characters + 4 user
defined characters + 120 symbols.
• CG ROM (For up to 256 characters), CG RAM (for 4
characters) and symbol register (for 120 symbols).
• No. of display digit and lines
< In normal mode >
1
(12 digits + 4 segments for signal) × 3 lines + 120
symbols + 5 static symbols (SED1220D
**
)
2
(12 digits + 4 segments for signal) × 2 lines + 120
symbols + 5 static symbols (SED1221D
**
)
3
12 digits × 2 lines + 120 symbols + 5 static symbols
(SED1222D
**
)
4
(12 digits + 4 segments for signal) × 2 lines + 120
symbols + 10 static symbols (SED122AD
**
)
< In standby mode >
1
5 static symbols
2
5 static symbols
3
5 static symbols
4
10 static symbols