Purdy AND481GST - Manual (Page 2)

Intelligent Character Display
AND481GST/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.ANDdisplays.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 V
DD
5V
2 V
SS
0V
3 V
O
Contrast Adj.
4 RS Register Select
5 R/W Read/Write
6 E Enable Signal
7 DB0 Data Bit 0
8 DB1 Data Bit 1
9 DB2 Data Bit 2
10 DB3 Data Bit 3
11 DB4 Data Bit 4
12 DB5 Data Bit 5
13 DB6 Data Bit 6
14 DB7 Data Bit 7
Temperature Variations
Temperature V
DD
–V
O
0°C 5.00
+25°C 4.75
+50°C 4.50
E
R/W
RS
V
DD
V
O
DB7-DB0
LCD
CONTROLLER
LSI
HD4478OU
or
Equivalent
V
SS
CONTROL SIGNAL 4
SEG 40
COM 16
LCD PANEL
SEG 40
LCD SEGMENT DRIVER X 1