Datasheet

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EA DOGM204-A
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.
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 66 x 40 mm at the standard font size of 4.8 mm (4 x 10)
* ultra-flat at 2.0 mm without backlight or 5.8 mm including LED backlight
* 4-bit, 8-bit, SPI interface (2-/3-/4-wire) and I²C (2-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 can be supplied as of single units
* Changing background color
LED BACKLIGHTS
5 different variants are available for individual backlighting: white, yellow/green, red, amber and bi-
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 3.3 V and higher voltages.
Operation of the backlight requires an external
series resistor for current limiting. This can be
calculated by 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 backlight is a bit 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 with less tin.
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.
amber
EA LED66x40-A
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 2,1 V 72 mA 18 ohm 47 ohm
Connected in series 6,3 V 24 mA - -
white
EA LED66x40-W
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 3,2 V 90 mA 1,2 ohm 24 ohm
Connected in series 9,6 V 30 mA - -
green/red
EA LED66x40-GR
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
redpath(ARG/CR) 2,1 V 80 mA 24 ohm 48 ohm
green path (ARG/CG) 2,1 V 80 mA 18 ohm 39 ohm