Datasheet

EA DOGM128-6
Page 2
ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical errors reserved.
EA DOGM128
The EA DOGM128, a 128x64-pixel graphics display, is a new addition to ELECTRONIC ASSEMBLY’s EA DOGM
series. It, too, has pins that allow it to be mounted quickly and easily.
7 different optional LED backlights are available.
These can be combined with 5 different display technologies, making it possible to have up to around 20 different designs.
Designed for compact, handheld devices, this modern LCD series offers a number of benefits with and without backlighting:
* Extremely compact (55x46 mm) with a large viewing area of 51x31 mm
* Super-flat: 2.0 mm without backlight module, and only 5.8 mm with a b./l. module mounted
* Serial SPI interface (4-wire)
* Single supply +3.0 V or +3.3 V
* Typical power consumption of only 150µA in full operation (white LED backlight from 5mA)
* Easily mounted by soldering
* Wide range of design variants orderable as single units
* Backlighting color changes possible
CONTRAST ADJUSTMENT
The contrast can be set by means of a command for all the displays in the EA DOGM series. The contrast setting of the
display must be set once by the software, and is then kept constant throughout the entire operating temperature range (-
20..+70°C), thanks to the integrated temperature compensation.
LED BACKLIGHT
7 different variants are available for individual backlighting: white, yellow/green, green, blue, red, amber and a full-color
version.
There are 3 separate LED paths available for each monochrome backlight that can be switched in parallel or in series to
suit the system voltage. This means that most backlights can be run at either 3.3 V or 5 V.
To operate the backlight, we recommend a
current source (e.g. CAT4238TD) or an
external series resistor to limit the current. This
can be calculated from R=U/I; you can find the
values in the table on the right. To prolong the
life of the backlights, we recommend that you
use a current source.
The operating life of the yellow/green, red and
amber backlights is 100,000 hours. The life of
the white and blue backlights is considerably
shorter. We recommend that you dim these or
switch them off whenever possible.
Important: Never connect the backlight
LEDs directly to a 5 V/3.3 V supply as this
will immediately destroy the LEDs. Always
use a current source. Please note that
derating applies at temperatures exceeding +25°C.
ASSEMBLING
First, clip the display and backlight modules together by gently pushing the display pins through the corresponding holes
on the backlight module. Then insert the entire module into the socket, or into the soldering holes on the pcb. The
backlight pins (the 2 rows with 3 pins at the bottom) must be soldered on the top side as well to ensure good contact
between the modules.
Important: The display has a protective film on the top and/or the bottom, and there is also one on the
backlight. These must be removed.
Make sure that neither display nor backlight will never come into contact with any kind of liquid like Fluxer,
Cleaner, Water.
LED backlight
Forward voltage (V)
Current
max.
(mA)
Limiting resistor
(ohm, each path)
min typ max @3,3 V @5 V
yellow/green
EA LED55x46-G
2,1 40 40 97
white
EA LED55x46-W
3,3 25
CAT4238
82
amber
EA LED55x46-A
1,9 40 47 103
green
EA LED55x46-E
3 40 8,5 57
blue
EA LED55x46-B
3,3 30
CAT4238
68
red
EA LED55x46-R
1,9 40 47 103
full color
EA LED55x46-RGB
red green blue
40 each
colour
CAT4238
25
typ. 4V typ. 4V typ. 4V