ndbook, full pagewidth
1997 Apr 02
5
6
7
8
data to port
data to port
A2
A1
A0
0
A
DATA 1
A
DATA 2
A
Philips Semiconductors
SCL
1
2
3
4
slave address (PCF8574)
SDA
S
0
1
0
0
Remote 8-bit I/O expander for I
2
C-bus
start condition
R/W
9
t pv
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
WRITE TO
PORT
DATA OUT
FROM PORT
DATA 1 VALID
t pv
DATA 2 VALID
MBD974
PCF8574
Product specification
Fig.10 WRITE mode (output).