EL320.240-FA3 Operations Manual Page 13 of 25
Display Input Descriptions
Signal Description
VH
Power supply voltage for display functions. 12 VDC nominal.
V/Q
Format selection: in AMLCD timing modes, selects between VGA mode (high) and
QVGA mode. In VGA mode the upper left quadrant of data will be displayed.
Internally pulled low.
DE
Data Enable: in AMLCD non-fixed timing modes, the rising edge identifies the data
for the first pixel of each row and must stay high until the data for the last pixel of
each row is clocked. DE is also used to determine the video timing mode.
Internally pulled high to 3.3V.
LUMA
Analog Luminance Control: used to reduce the display luminance by reducing the
voltage applied to the display phosphor. If left open, defaults to the luminance set
by LUM0 and LUM1.
LUM0, LUM1 Digital Luminance Controls: used to reduce the luminance of the display by
reducing the frequency at which the display is scanned.
VS
Vertical Sync: identifies the start of each frame (entire screen) of data. Internally
pulled low.
HS
Horizontal Sync: identifies the start of each horizontal row of data.
VCLK
Video Clock: the falling edge latches the video data (R0, R1, G0, and G1)
R0
Video data: Least significant bit for red sub-pixel
R1
Video data: Most significant bit for red sub-pixel
G0
Video data: Least significant bit for green sub-pixel
G1
Video data: Most significant bit for green sub-pixel
SHUTDOWN Display Shutdown: when high, will disable the display, thus rendering the display
black and minimizing power. All display data will be stored but no new data
accepted when SHUTDOWN is high. Internally pulled low.
GND
Signal return for power and logic
Display Input Signal Requirements
Description Min
Max
Units
Notes
e Input Voltage Range
-0.3
5.5
V
Video logic high voltage
2.0
5.0
V
All input thresholds are TTL
Video logic low voltage
0
0.8
V
LUMA input voltage
0
5.5
V
LUMA input current
–250 0
uA
Note: 1. All inputs (except LUMA input) are 5V tolerant, with 270 ohm series resistors.
2. Input capacitance for all inputs except LUMA is 8 pF typical.
3. DE, LUM0, and LUM1 have > 20kohm pull-up resistors to 3.3V.
4. VS, SHUTDOWN, and V/Q have > 20kohm pull-down resistors to ground
