AND721GST Datasheet, PDF (2/2 Pages) Purdy Electronics Corporation – Intelligent Character Display

Connector Pin Assignment
AND721GST/GST-LED
Intelligent Character Display
Connector Pin Assignment
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Signal
GND
V_DD
V_O
RS
R/W
E
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
LED
LED
Function
Ground
+5 Power Supply
LCD Drive Voltage
“H” Data Input
“L” Command Input
Read/Write
Enable
Data Bus
DB0-DB7 are for 8-bit operation
DB4-DB7 are for 4-bit operation
LED Anode (+)
LED Cathode Ground
Block Diagram
Power Supply
The LCD panel is driven by the voltage V_DD–V_O, so an
adjustable V_O is required for contrast control and
temperature compensation.
Temperature Variations
Temperature
0°C
+25°C
+50°C
V_DD–V_O
5.00
4.75
4.50
Power Supply Block Diagram
V_DD
(+5V)
V_DD – V_O
V_O
VR
V_DD
GND
V_DD – V_O = LCD Drive Voltage
VR10 to 20 kΩ
E
R/W
RS
DBO-DB7 8
V_DD
V_O
GND
4
40
Controller/
Driver
16
16 16
Driver
40
LCD
40
Driver 4
40
Driver
20
4
Driver
20
Dimensional Outline
Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085
7-27-99
Tel: [phone] • Fax: [phone] • [e-mail] • www.purdyelectronics.com
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