C-51505NFQJ-LR-AG (AG) No. 2002-0185

OPTREX CORPORATION

Page 9/18

4.I/O Terminal

4.1.Pin Assignment

CN1

No.

Symbol

Function

1

LED (A)

LED Anode Terminal

2

LED (K)

LED Cathode Terminal

3

Power Supply (0V, GND)

4

Power Supply for Logic

5

Power Supply for LCD Drive

6

RS

Register Select Signal

7

R/W

Read/Write Select Signal H : Read L : Write

8

E

Enable Signal (No pull-up Resister)

9

DB0

Data Bus Line / Non-connection at 4-bit operation

10

DB1

Data Bus Line / Non-connection at 4-bit operation

11

DB2

Data Bus Line / Non-connection at 4-bit operation

12

DB3

Data Bus Line / Non-connection at 4-bit operation

13

DB4

Data Bus Line

14

DB5

Data Bus Line

15

DB6

Data Bus Line

16

DB7

Data Bus Line

CN2

No.

Symbol

Function

1

LED (A)

LED Anode Terminal

2

LED (K)

LED Cathode Terminal

4.2.Example of Power Supply

It is recommended to apply a potentiometer for the contrast adjust due to the

tolerance of the driving voltage and its temperature dependence.

MODULE

VCC

VEE

VSS

VCC (+Voltage)

VR=10~20KΩ

VSS (0V)

VR