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PICDEM? LCD 2 Demonstration Kit User’s Guide
A.2
LCD DISPLAY
A custom-made segmented LCD glass, manufactured by the Varitronix Corporation, is
provided as shown in Figure A-2. This LCD has 4 commons and 32 segments.
specification sheet (VL_5573_V00) for additional details.
FIGURE A-2:
COM2
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
COM3
Legend:
PICDEM? LCD 2 DISPLAY
N.C. = No connection
COM1
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
COM0
? VL Electronics
TABLE A-2:
LCD GLASS SPECIFICATIONS
Type
P.I.D.
Mode/Color/Type
Viewing Direction
Driving Scheme
Drive Voltage (VLCD)
Operating Temperature
Storage Temperature
Polarizer – Front
Polarizer – Back
Specification
VL_5573_V00
Positive / -- / TN
6:00 O’Clock
1/4 Duty, 1/3 Bias
~3.0 Volt (p-p), +20°C
0°C - +50°C
-10°C - +60°C
STD.Transmissive
STD.Reflective
Since the glass used on the PICDEM LCD 2 operates at 3V, there is a voltage protec-
tion circuit on the LCDBIAS3 pin, which is enabled in the default configuration. When
enabled, even if the V DD is greater than 3V, it regulates the LCDBIAS3 voltage such
that it always maintains the value to 3V. This is not necessary for operation of the LCD
module, but it is a protection circuit to prevent accidentally applying voltages higher
than 3V to the LCD glass present on the board.
DS51662C-page 26
? 2010 Microchip Technology Inc.
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