1.0 Overview
1.1 Description
The SED1520 is a dot matrix LCD driver LSI intended
for display of characters and graphics. It generates
LCD driving signals based on bit image display data
supplied from an 8-bit or 16-bit microcomputer and
stored in the on-chip display data RAM.
The SED1520 incorporates innovative circuit design
strategies to assure very low current dissipation and
a wide range of operating voltages. With these features,
the SED1520 permits the user to implement
high-performance handy systems operating from a
miniature battery.
In order for the user to adaptively configure his system,
the SED1520 family offers two application
forms. One form allows an LCD display of 12 characters
´ 2 lines with an indicator with a single chip. The
other is dedicated to driving a total of 80 segments,
enabling a medium-size display to be achieved by
using a minimum number of drivers.
1.2 Features
• Direct display of data read from display data
RAM
RAM bit data: ‘0’ — LCD off
‘1’ — LCD on
• Fast 8-bit MPU interface; direct interface with
80- or 68-family microcomputer
• On-chip LCD driving circuits — 80 (segment +
common) driver sets
• Duty ratios to choose from:
Command setup 1/16, 1/32
(SED1520F)
External input sync 1/8 to 1/32
(SED1521F)
• A variety of command functions, including:
Read/Write Display Data, Display ON/
OFF, Set Address, Set Display Start Line,
Set Column Address, Read Status, Static
Drive ON/OFF, Select Duty, Read Modify
Write, Select Segment Driving Selection,
Save Power, etc.
• Very low power dissipation — 30 mW maximum
(External clock operation: 2 kHz)
• Wide spectrum of supply voltages
VDD – VSS –2.4V to –7.0V
VDD – V5 –3.5V to –13.0V
• CMOS process
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