Datasheet

EA DOGS102-6
Page 3
ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical errors reserved.
LED-BACKLIGHT
3 different variants are available for individual backlighting:
white, amber and a duo-color green/ren 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 a higher voltage.
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 amber and green/red backlights
is 100,000 hours. The life of the white backlight 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.
If you see black and white pictures on this page but you want to see the colors of the displays, you can download a full-
colored version of this document at
http://www.lcd-module.de/eng/pdf/grafik/dogs102-6e.pdf
EA LED39x41-A Amber
EA LED39x41-GR Green/Red
EA LED39x41-W White
amber
EA LED39x41-A
Forward
voltage
Current
max.
Limiting resistor
@ 3,3 V @ 5 V
Connected in parallel
2,2 V 80 mA 15 ohm 36 ohm
Connected in series
4,4 V 40 mA
CAT4238
15 ohm
white
EA LED39x41-W
Forward
voltage
Current
max.
Limiting resistor
@ 3,3 V @ 5 V
Connected in parallel
3,3 V 60 mA 0 ohm 28 ohm
Connected in series
6,6 V 30 mA use CAT4238
green/red
EA LED39x41-GR
Forward
voltage
Current
max.
Limiting resistor
@ 3,3 V @ 5 V
red path (ARG/CR)
1,9 V 60 mA 24 ohm 51 ohm
green path (ARG/CG)
2,0 V 80 mA 18 ohm 39 ohm