Purdy AND491GST-LED - Manual (Page 2)

Intelligent Character Display
AND491GST-LED
Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085
3/3/08 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 V
SS
0V
2 V
DD
5V
3 V
O
Contrast Adj.
4 RS Register Select
5 R/W Read/Write
6 E Enable
7 DBO 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
15 A LED Power
16 K Led Power
Temperature Variations
Temperature V
DD
–V
O
0°C 4.80
+25°C 4.50
+50°C 4.20
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)