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Interfacing and Operation
Control Basics
Power Requirements
The LC640.480.33-AC display requires two power supplies: +5 Vdc for the LCD logic
and +12 Vdc for the backlight. In Table 6 below, the backlight current and power are
referenced to maximum luminance, 25 °C ambient temperature.
Table 6. Input Power
Backlight
Backlight voltage
Absolute max. voltage
Steady state current (V
Peak start-up current (V
Power (V
LCD
LCD voltage
Absolute max. voltage
V
permissible ripple (V
L
Current (V
Power (V
CAUTION: Absolute maximum ratings are those values beyond which damage to
the device may occur.
Undervoltage Lockout (Backlight only)
An undervoltage lockout (UVLO) function is included which disables the backlight
under excessively low V
approximately +8.5 Vdc as V
Vdc as V
Power Sequencing (LCD only)
Certain restrictions on the behavior of the V
the V
source relative to the application or removal of the video signals must be
L
observed. These restrictions are shown in Figure 2, where "Vcc"= V
signals.
8
LC640.480.33-AC Operations Manual (OM600-01)
= +12 Vdc)
H
= +12 Vdc)
H
= +12V)
H
= +5V)
L
= +5V)
L
= +5V)
L
conditions. The UVLO circuit will disable the backlight at
H
falls and will enable the backlight at approximately +9.5
H
rises.
H
Symbol
Min
Typ
V
+10.8
+12.0
H
V
0
–
HMAX
I
–
1.9
H
I
–
–
HSU
P
–
23
H
V
4.5
+5.0
L
V
0
–
LMAX
–
–
V
L
I
–
280
L
P
–
1.4
L
(+5 Vdc) source and in the application of
L
Max
Units
+13.2
Vdc
+16
Vdc
2.5
Adc
3.5
Adc
30
W
+5.5
Vdc
6.0
Vdc
100
mVpp
450
mAdc
2.3
W
and "data" = video
L
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