Data Sheet

1997 Apr 02 9
Philips Semiconductors Product specification
Remote 8-bit I/O expander for I
2
C-bus
PCF8574
n
dbook, full pagewidth
MBD974
S 0 1 0 0 A2 A1 A0 0 A
start condition
DATA 1
R/W acknowledge
from slave
A DATA 2 ASDA
SCL
WRITE TO
PORT
t
pv
DATA OUT
FROM PORT
slave address (PCF8574) data to port data to port
12345678
acknowledge from slave
acknowledge from slave
t
pv
DATA 2 VALIDDATA 1 VALID
Fig.10 WRITE mode (output).