EADOGS102-6

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/red 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:

Do 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-

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