EDP-I
The simplest way to
evaluate LCD
modules!
The EDP-I is designed for evaluating
LCD modules without having to lay out
your own design. It provides pinouts for
the most popular modules in the industry
and an easy to use keyboard interface.
Demonstrating, comparing and
evaluating different modules has never
been easier. Just plug in a standard AT
style keyboard and the LCD module of
your choice. The built-in line editor will
give you complete control over the
display.
Contrast and backlight levels can be
controlled via the keyboard. Two user
defined screens can be stored in memory,
one of which is displayed on power up.
Supported Pinouts
LCD Module Evaluation
& Development Platform
Software
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•
•
•
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selectable modes:
8x1, 8x2,
12x2
16x1, 16x2, 16x4
20x2, 20x4
24x2
40x2, 40x4
Supported pinouts are shown below. These allow
most LCD modules that use an HD44780
compatible controller to be connected directly.
Of course, non-standard pinouts can always be
wired in using ribbon cable.
JEM Innovation Inc., 125 Stearman Court, Erie, CO 80516
www.jeminnovation.com
EDP-I
Technical Specifications and Features:
Basic software Functions:
F1: toggle between modes: 8x1
÷
8x2
÷
12x2 ... 40x4
÷
8x1; optionally stored in non-volatile memory
F2: recall screen 1
F3: recall screen 2
F5: Increase contrast
F7: Increase backlighting
<shift> F2: store current screen in m emo ry 1
<shift> F3: store current screen in memory 2 (displays at power up)
F6: Decrease co ntrast
F8: Decrease backlighting
Standard editor keys: backspace, enter, home, delete, end, page up, page down, arrow keys, caps lock, num lock.
Tab: centers cursor on the current line.
Due to the wide current range of backlighting options,
the EDP-I must be used with an external regulated 5
volt supply (5 VDC +/- 5%). Both a standard 2.1 mm
(P-5) connector and solder connections are provided.
ED P-I only:
EDP -I, LCD (no backlight),
with typical keyboard:
Backlight alone, using on-board control
< 5mA
350 mA
0 - 650 mA
The EDP-I uses an Atmel ATMEGA8 processor and
can be reprogrammed for custom embedded
applications. There are 12 available I/O pins
(including 8 ADC inputs).
Of course, we’d be happy to provide custom features
such as a serial port interface; monitoring and
displaying ADC inputs or just about anything you can
dream up. Contact JEM Innovation for details.
Notes:
1.
All connectors are top view. All pins are on 0.10" centers unless otherwise noted.
2.
The ED P-I doe s not include headers, connectors , keyboard or p ower sup ply. These are available from our distributors.
3.
Some modules may require separate connection to A or K for the backlight. Solder pads are provided on the board.
4.
Backlight currents above 650 mA req uire external contro l. See users guide for d etails.
5.
This board sup ports the pseudo-standard H D4 478 0 7 b it interface; DB 0, DB1 , DB 2 and DB 3 are not used and are lab eled as NC .
An extra E nable line is provided for 40 x 4 displays.
6.
Only one display can be used at a time; verify interface prior to installation.
7.
Numero us jumpers a nd test p oints are provided . The se includ e access for m easuring the backlight current.
8.
The user can rep rogra m the b oard using the AT MEL deve lopm ent connector. However, source code for the ke yboa rd interface is
NO T p rovid ed.
Reprogramm ing the EDP-I will erase the keyboard interface routine.
9.
Users must ensure that they do not exceed the maximum backlight current for the particular module they are using!
10. Very few modu les require a ne gative voltage at room temperature; there fore, we recommend using modules without Vee.
11. Softwa re contrast co ntrol must be d isabled to use the negative voltage in the contra st circuit.
12. Configuration details are available in the user’s guide.
Copyright 2004 by JEM Innovation Inc. Authorized Distributors may reproduce as needed, provided references to JEM remain intact.
Visit:
www.jeminnovation.com
for other products and services
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