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13
1
5
4
1E
1Y
2E
2Y
1Z
2Z
2
3
Schematic diagram (one switch).
nE
V CC
GND
13
INT
1
A0
2
A1
3
A2
14
SCL
15
SDA
16
V DD
8
V SS
ITC222 - PTV
First issue 02 / 04
IK217 - NCP303LSN30T1
2
Input
V
ref
3
Gnd
IX440 - 74HC4066PW
6
8
12
11
3E
3Y
4E
4Y
3Z
4Z
9
10
nY
V CC
nZ
IR006 - PCF8574TS
Remote 8-bit I/O expander
INTERRUPT
LOGIC
2
INPUT
I C BUS
FILTER
CONTROL
POWER-ON
RESET
1
Reset Output
R
D
5
C
D
FUNCTION TABLE
INPUT NE
L
H
H = HIGH voltage level; L = LOW voltage level.
LP FILTER
PCF8574
SHIFT
8 BIT
REGISTER
WRITE pulse
READ pulse
119
SWITCH
OFF
ON
4
P0
5
P1
6
P2
7
P3
I/O
9
PORT
P4
10
P5
11
P6
12
P7
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