Purdy AND471GST - Manual (Page 2)

Intelligent Character Display
AND471GST/GST-LED
Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085
7/20/07 Tel: 408.523.8200 • Fax: 408.733.1287 • [email protected] • www.purdyelectronics.com 2
Power Supply
The LCD panel is driven by the voltage V
DD
–V
O
, so you need
an adjustable V
O
for contrast control and temperature
compensation.
Power Supply Block Diagram
Block Diagram
Dimensional Outline
Connector Pin Assignment
Pin No. Signal Function
1 GND Ground
2 V
DD
+5 Power Supply
3 V
O
LCD Drive Voltage
4 RS
“H” Data Input
“L” Command Input
5 R/W Read/Write
6 E Enable
7 DBO
Data Bus
DB0-DB7 are for 8-bit operation
DB4-DB7 are for 4-bit operation
8 DB1
9 DB2
10 DB3
11 DB4
12 DB5
13 DB6
14 DB7
Temperature Variations
Temperature V
DD
–V
O
0°C 5.00
+25°C 4.75
+50°C 4.50
V
DD
V
O
GND
V
DD
– V
O
V
DD
– V
O
= LCD Drive Voltage
VR10 to 20 k Ω
VR V
DD
(+5V)
Controller/
Driver
E
R/W
RS
V
DD
V
O
GND
DB0-DB7 8
40
16
1
LCD
Driver
40