PCF8575
REMOTE 16-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT
www.ti.com
SCPS121C–JANUARY 2005–REVISED OCTOBER 2006
SDA
SCL
Data Line
Stable;
Change
of Data
Data Valid
Allowed
Figure 2. Bit Transfer
Data Output
by Transmitter
NACK
Data Output
by Receiver
ACK
SCL from
Master
1
2
8
9
S
Start
Clock Pulse for
Condition
Acknowledgment
Figure 3. Acknowledgment on I2C Bus
Interface Definition
BIT
BYTE
7 (MSB)
L
6
5
4
3
2
1
0 (LSB)
I2C slave address
P0x I/O data bus
P1x I/O data bus
H
L
L
A2
A1
A0
R/W
P00
P10
P07
P06
P16
P05
P15
P04
P14
P03
P13
P02
P12
P01
P11
P17
6
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