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Intelligent Character Display
AND791GST/GST-LED
Purdy Electronics Corporation • 720 Palomar Avenue • Sunnyvale, CA 94085
4/2/05
Tel: 408.523.8200 • Fax: 408.733.1287 • email@purdyelectronics.com • www.purdyelectronics.com
2
Power Supply
LCD panel is driven by the voltage V
DD–V
O, so an adjustable
VO is required for contrast control and temperature
compensation.
Power Supply Block Diagram
Dimensional Outline
Connector Pin Assignment
Pin No.
Signal
Function
1
DB7
Data bus line
DB0-DB7 are for 8-bit operation
DB4-DB7 are for 4-bit operation
2
DB6
3
DB5
4
DB4
5
DB3
6
DB2
7
DB1
8
DB0
9
E1
Enable (for upper 2 lines)
10
R/W
L: Data write from MPU to LCM. H: Data read
from LCM to MPU
11
RS
L: Instruction code input. H: Data input
12
VO
Liquid crystal driving voltage
13
GND
Ground
14
VDD
Power supply voltage + 5V
15
E2
Enable (for lower 2 lines)
16
NC
No Connect
Temperature Variations
Temperature
VDD–VO
0°C
5.00
+25°C
4.75
+50°C
4.50
V
DD
V
O
GND
V
DD – VO
V
DD – VO = LCD Drive Voltage
VR10 to 20 k
Ω
VR
V
DD
(+5V)
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