
EA DOGM132-5
Page 2
ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical errors reserved.
EA DOGM132
The EA DOGM132, a 132x32-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. 6 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 (55x31 mm) with a large viewing area of 51x15 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 +2.4 V or +3.3 V
* T ypical power consumption of only 140µA in full operation (white LED backlight from 5mA)
* Easily mounted by soldering
* W ide 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
6 different variants are available for individual backlighting: white, yellow/
green, blue, red, amber and a full-color version.
There are 2 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.
W e 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.
yellow/green
EA LED55x31-G
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 2,2 V 80 mA 14 ohm 35 ohm
Connected in series 4,4 V 40 mA -15 ohm
white
EA LED55x31-W
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 3,2 V 60 mA 1,6 ohm 30 ohm
Connected in series 6,4 V 30 mA - -
blue
EA LED55x31-B
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 3,2 V 60 mA 1,6 ohm 30 ohm
Connected in series 6,4 V 30 mA - -
amber
EA LED55x31-A
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 2,4 V 80 mA 11 ohm 32 ohm
Connected in series 4,8 V 40 mA -5 ohm
red
EA LED55x31-R
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 2,1 V 80 mA 15 ohm 36 ohm
Connected in series 4,2 V 40 mA -20 ohm
Full color
EA LED55x31-RGB
Forward
voltage
Current
max.
Limiting resistor
@3,3 V @5V
Connected in parallel 4V 125 mA -3x24 ohm