Datasheet

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EA DOGS104-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 36,0x27,5 mm at the standard font size of 2.6 mm (4 x 10)
* ultra-flat at 2.0 mm without backlight or 4.6 mm including LED backlight
* SPI interface (2-/3-/4-wire) and I²C (2-wire)
* typical power consumption of only 440µA 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
3 different variants are available for
individual backlighting: amber, yellow-
green/red, green/red/white.
For the amber backlight, 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 LED36x28-A
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
Connected in parallel 2,1 V 60 mA 20 ohm 48 ohm
Connected in series 4,2 V 30 mA - 27 ohm
green/red/white
EA LED36X28-ERW
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
green path 3,0V 45 mA 7 ohm 45 ohm
red path 2,1 V 45 mA 27 ohm 65 ohm
white path 3,0 V 30 mA 10 ohm 67 ohm
yellowgreen/red
EA LED36x28-GR
Forward
voltage
Current
max.
Limiting resistor
@3,3V @5V
red path (AGR/CR) 2,1 V 45 mA 27 ohm 65 ohm
yellowgreen path (AGR/CG) 2,1 V 60 mA 20 ohm 48 ohm