Datasheet

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SDA
SCL
Data Line
Stable;
Data Valid
Change
of Data
Allowed
Data Output
by Transmitter
SCL from
Master
Start
Condition
S
1 2 8 9
Data Output
by Receiver
Clock Pulse for
Acknowledgment
NACK
ACK
PCF8575
REMOTE 16-BIT I
2
C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT
SCPS121D – JANUARY 2005 – REVISED APRIL 2007
Figure 2. Bit Transfer
Figure 3. Acknowledgment on I
2
C Bus
Interface Definition
BIT
BYTE
7 (MSB) 6 5 4 3 2 1 0 (LSB)
I
2
C slave address L H L L A2 A1 A0 R/ W
P0x I/O data bus P07 P06 P05 P04 P03 P02 P01 P00
P1x I/O data bus P17 P16 P15 P14 P13 P12 P11 P10
6
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