EA DOGM128-6

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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