LS7222 View Datasheet(PDF) - LSI Corporation
Part Name
Description
Manufacturer
LS7222 Datasheet PDF : 4 Pages
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TO MASTER
ALARM SYSTEM
CONTROLLER
LOCK
INDICATOR
+V
LS7222
IMPULSE LATCHING
ELECTRO-MECHANICAL
LOCK
PROGRAM
MODE
INDICATOR
R RR R
*
Ø
#
+V
X4
7
8
9
See Note 3
X3
4
5
6
X2
1
2
3
X1
FIGURE 2. TYPICAL APPLICATION
Y1
Y2
Y3
Y4
NOTES:
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 = 10kΩ, 1/4 W .
7222-012901-4
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