TO MASTER

ALARM SYSTEM

CONTROLLER

LOCK

INDICATOR

+V

IMPULSE LATCHING

ELECTRO-MECHANICAL

LOCK

PROGRAM

MODE

INDICATOR

+V

7

8

9

4

5

6

1

2

3

X4

X3

X2

X1

Y4

Y3

Y1

Y2

Ø

#

*

FIGURE 2. TYPICAL APPLICATION

1. Keypad is typical 4 X 3 matrix type. Switch resistance should be

≤ 1kΩ.

2. Configuration shown is typical. The outputs of the LS7222 are functionally designed

to provide either status or display information.

3. Resistors may be added in series with X inputs to provide protection against ESD from the keypad. R = 10k

Ω, 1/4 W .

NOTES:

LS7222

R

R

R

R

See Note 3

7222-012901-4