Specifications
EPSON 7–1
SED1234/35 Series
SED1234/35
Series
• CR oscillation circuit (on-chip C and R)
• High-speed MPU interface
Interfacing with both 68 series and 80
series MPU
Interfacing in 4 bits/8 bits
• Serial interface
• Character font 5 × 7 dots
• Duty ratio 1/16 (SED1235)
1/30 (SED1234)
• Simple command setting
• Built-in liquid crystal driving power circuit
Power boosting circuit, power regulating circuit,
voltage follower × 4
• Built-in electronic volume function
• Low power consumption
100 µA Max. (In normal operation mode:
Including the operating current
of the built-in power supply)
• Power supply
V
DD - VSS (logic section): –2.4 V to –3.6 V
V
DD - V5 (liquid crystal drive section)
: –5.0 V to –8.0 V
• Wide operating temperature range
Ta = -30 to 85°C
• CMOS process
(Pad Pitch)
• COB assemble 126 µm min.
• Delivery form: Chip SED123✽D
✽A, SED123✽D✽C
• This IC is not designed with a protection against
radioactive rays.
OVERVIEW
The SED1234, 1235 Series is a dot matrix LCD controller
driver for character display, and can display a maximum
of 48 characters, 4 user-defined characters, and a maxi-
mum of 48 symbols by means of 4-bit, 8-bit or serial data
sent from a microcomputer.
A built-in character generator ROM is prepared for 256
character types, and each character font consists of 5 × 7
dots. A user-defined character RAM for four characters
of 5 × 7 dots are incorporated, and a symbol register is
also incorporated. With these, it is possible to apply this
Series to display with a high degree of freedom. This
Series can operate handy units with a minimum power
consumption by means of its low power consumption
and sleep mode.
SED1234, and 1235 depending on the duty of use and the
number of display columns.
FEATURES
• Built-in diplay RAM
48 characters + 4 user-defined characters + 48 sym-
bols
• CG ROM (for up to 256 characters), CG RAM (4
characters), and symbol register (48 symbols)
• Number of display columns × number of lines
(12 columns + 2 segment for signal) × 4 lines + 48
symbols: SED1234
(12 columns + 2 segment for signal) × 2 lines + 48
symbols: SED1235