PCF8575
REMOTE 16-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT
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SCPS121C–JANUARY 2005–REVISED OCTOBER 2006
LOGIC DIAGRAM (POSITIVE LOGIC)
PCF8575
1
Interrupt
Logic
LP Filter
INT
21
2
A0
A1
A2
P07−P00
P17−P10
3
22
23
SCL
SDA
2
Input
Filter
I C Bus
Shift
Register
I/O
Port
16 Bits
Control
Write Pulse
Read Pulse
24
12
V
Power-On
Reset
CC
GND
SIMPLIFIED SCHEMATIC DIAGRAM OF EACH P-PORT INPUT/OUTPUT
V
CC
Write Pulse
I
OH
100 µA
I
OHT
Data From
Shift Register
D
C
Q
FF
S
P07−P00
P17−P10
I
I
OL
Power-On
Reset
D
C
Q
GND
FF
S
I
Read Pulse
To Interrupt
Logic
Data To
Shift Register
4
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