AND491GST/GST-LED
Intelligent Character Display
Connector Pin Assignment
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Signal
GND
V
DD
V
O
RS
R/W
E
DBO
DB1
DB2
DB3
DB4
DB5
DB6
DB7
GND
V
DD
– V
O
= LCD Drive Voltage
VR10 to 20 kΩ
V
DD
(+5V)
Power Supply
Function
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.
Temperature Variations
Temperature
0°C
+25°C
+50°C
Power Supply Block Diagram
V
DD
–V
O
Ground
+5 Power Supply
LCD Drive Voltage
“H” Data Input
“L” Command Input
Read/Write
Enable
5.00
4.75
4.50
Data Bus
DB0-DB7 are for 8-bit operation
DB4-DB7 are for 4-bit operation
V
DD
– V
O
V
O
VR
V
DD
Block Diagram
E
R/W
RS
DB0-DB7
V
DD
V
O
GND
8
Controller/
Driver
40
1
16
LCD
40
Driver
Dimensional Outline
9/8/98
Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94086
Tel: 408.523.8200 • Fax: 408.733.1287 • email@purdyelectronics.com • www.purdyelectronics.com
2-11
PURDY [ PURDY ELECTRONICS CORPORATION ]
