Industrial Electronic Engineers, Inc.
SIZE
A
CODE IDENT NO.
05464
SLB325-X4X0
Van Nuys, California
SCALE N/A
REV
B
SHEET 3
05/23/02
1.0
GENERAL DESCRIPTION
1.1
Introduction
This specification describes the interface requirements and features of a 4 line supertwist Liquid Crystal
Display (LCD) with 20 characters per line and a fiber optic (FO) backlight. The characters are formed using a
5x8 dot matrix.
1.2
Application
This unit may be used as a console display which provides alphanumeric information that is easily readable in
high ambient light or with the backlight, in low light conditions. It is ideal for point-of-sale terminals, office
computers, and a wide range of business and industrial equipment.
1.3
Special Features
Minimum depth
8 User defined characters
Power and data on same connector
ASCII + 6 additional character sets
11-29 VDC operation
EIA-232C or EIA-422A data interface
Low cost
Software selectable blink
Shielded I/O and Connector
Software self test
Wide operating temperatures (-20 to +70
°
)
1.4
Description
This LCD module is a self-contained multiplexed display which provides a simple serial interface to a
microprocessor system.
The display is available with one I/O connector and a choice of EIA-232C or EIA-422A interfacing.
The SBE liquid crystal cell used in this display has a golden-green background with dark blue-black
characters.
This unit consists of a liquid crystal display tube and a minimal amount of electronic hardware. All display
characters and control codes can be accessed in a 8-bit format. Primary complexity is contained within the
microprocessor software, which controls all display functions. Temperature compensation circuitry is provided
to insure that viewing characteristics are optimized for all temperatures.
A fiber optic backlight illuminated by two ultra-bright yellow LEDs is mounted behind the LCD to allow for low
light level operation. Note that the display background remains golden-green. Backlight power is controlled
by two software control codes
A single 5VDC
±
5% power supply is required for operation. At 12.0VDC, total power is approximately .70
watts and current is about 58mA without the backlight, and 100mA with the backlight ON.
Data is entered serially at 9600 Baud at rates determined by execution times.
The large characters are easily readable, even in direct sunlight and provide comfortable short or long-term
viewing.
Figures 3 through 10 depict character sets used in this module.
