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DOGXL240-7 GRAPHIC
PINOUT
The EA DOGXL240-7, a 240x128 dots graphics
display, is a new addition to ELECTRONIC
ASSEMBLY’s EA DOG series. It, too, has pins that
allow it to be mounted quickly and easily.
CONTRAST ADJUSTMENT
The contrast can be set by means of a command
for all the displays in theEA DOGXL- Series. iThe
contrast setting of the display must be set once
by the software, and is then kept constant
throughout the entire operating temperature range
(-20..+70°C), thanks to the integrated temperature
compensation.
LED-BACKLIGHT
3 different variants are available for individual backlighting: white, amber and a duo-color green/red
version.
With the amber backlight, there are 3 separate LED paths containig 5 parallel LEDs, that can be
switched in parallel or in series to suit the system’s voltage.
With the white backlight, there are 3 separate LED paths containig 3 LEDs in series. To operate the
backlight, we recommend a current source (e.g. CAT4238TD).
The duo-color backlight has common anode and two terminals for driving the red and / or the green
color.
The operating life of the amber and green/red backlights is 100,000 hours. The LEDs of the white
backlight are high qualitiy NICHIA LEDs. To achieve the life-time of 100k hours, we recommend dimming
or switching 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.
Applikationsbeispiel EA LED94X67-W
LED backlight
(each path )
Forward
voltage Current
max.
typ
white
EA LED94x67-W 9.6 V 15 mA
LED backlight
(each path )
Forward
voltage Current Limiting resistor
(ohm)
typ max @3,3 V @5 V
amber
EA LED94x67-A 2.1 V 100 mA 12 29
LED backlight
(each color)
Forward
voltage Current
Limiting
resistor
(ohm)
typ max @5 V
full color
EA LED94x67-GR 2.1 V 120 mA 25
Pin Symbol Level Function Pin Symbol Level Function
1NC (A1+: LED backlight) 21 VB0+ -Voltage Converter
2NC (A2+: LED backlight) 22 VB1+ -Voltage Converter
3NC (A3+: LED backlight) 23 VB1- -Voltage Converter
424 VB0- -Voltage Converter
525 VA0+ -Voltage Converter
626 VA1+ -Voltage Converter
727 VA1- - Voltage Converter
828 VA0- - Voltage Converter
929 VLCD - Po w e r L C Dr iv e
10 30 VDD H Pow er Supply +2,7..3,3V
11 31 VSS LPow er Supply 0V (GND)
12 32 VSS
13 33 BM0 H / L Config Serial Interface
14 34 CD H/L L= Command, H= Data
15 35 CS1 ( A 3) HChip Select (high low )
16 36 CS0 ( A 2) LChip Select (active low )
17 37 RST LReset (active low )
18 NC (C1-: LED backlight) 38 SCK (D0) H/L Serial Clock
19 NC (C2-: LED backlight) 39 SDA (D3) H/L Serial Data
20 NC (C3-: LED backlight) 40 D13 H/L Config Serial Interface