Intelligent Character Display

AND771GST/GST-LED

Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085

3

Tel: 408.523.8200 • Fax: 408.733.1287 • sales@purdyelectronics.com • www.purdyelectronics.com

7/23/07

Power Supply

LCD panel is driven by the voltage V

is required 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

+5 Power Supply

3

LCD Drive Voltage

4RS

“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

15

NC

No Connection

16

NC

No Connection

Temperature Variations

Temperature

0°C

5.00

+25°C

4.75

+50°C

4.50

V

DD

V

O

GND

V

V

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

2

LCD

Driver

40

Driver

40