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EA DOG-M

EA DOG SERIES

With its EA DOG series, ELECTRONIC ASSEMBLY presents the world’s first display series which

will run on 3.3 V systems without auxiliary power. They can, of course be used on traditional 5 V

systems.

Unlike normal LCD modules, you order the display and the corresponding backlight separately. This

gives you a wealth of possible combinations.

Designed for compact hand-held devices, this modern LCD range provides a number of real benefits

with or without backlight:

*

extremely compact at 55 x 31 mm at the standard font size of 5.57 mm (2 x 16)

*

ultra-flat at 2.0 mm without backlight or 5.8 mm including LED backlight

*

4-bit, 8-bit and SPI interface (4-wire)

*

typical power consumption of only 250µA in full operation (LED white backlight as of 3mA)

*

easy installation by simply soldering into the board

*

A whole range of design variants (63) can be supplied as of single units

*

Changing background color

SETTING THE CONTRAST

The contrast on all displays of the EA DOG series can be set with a command. This is done using

bits C0 through C5 in the commands "Contrast Set" and "Power/Icon Control/Contrast Set". Generally,

the contrast is set once and kept constant across the entire operating temperature range (-20 through

+70°C) thanks to the integrated temperature compensation function.

Even when run at 3.3 V, the displays do not require any additional negative voltage!

LED BACKLIGHTS

6 different variants are available for individual backlighting:

white, yellow/green, blue, red, amber and full color.

For monochrome backlights, 2 separate LED paths are

available, which can be switched in parallel or in series to

ideally match the system voltage. This means that all the

backlights can be run either at 5 V or at 3.3 V.

Operation of the backlight requires an external series

resistor for current limiting. This can be calculated from

R=U/I; you will find the values in the table. To improve life

time it is recommanded to use a current source only.

The operating life of the yellow/green, red and amber

backlights is 100,000 hours and that of the white and blue

backlights much shorter.

Important: Never operate the backlight directly on a 5 V/

3.3V supply, as this can immediately destroy the LEDs!

INSTALLATION

First, the display and the corresponding backlight are

clipped together. The complete unit is then inserted into a

PCB and soldered. Note that the 4 pins for the backlight

must also be soldered from the top.

Important: There are one or two protective films on the

display (top and/or rear side) and one on each backlight.

Those have to be removed during or after production.

yellow/green

EA LED55x31-G

Forwar

voltage

Current

max.

Limiting resistor

@ 3,3 V

@ 5 V

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

Forwar

voltage

Current

max.

Limiting resistor

@ 3,3 V

@ 5 V

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

Forwar

voltage

Current

max.

Limiting resistor

@ 3,3 V

@ 5 V

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

Forwar

voltage

Current

max.

Limiting resistor

@ 3,3 V

@ 5 V

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

Forwar

voltage

Current

max.

Limiting resistor

@ 3,3 V

@ 5 V

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

Forwar

voltage

Current

max.

Limiting resistor

@3,3 V

@ 5 V

Connected in parallel

4 V

125 mA

-

3x24 ohm