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2002 Nov 22
slave address (PCF8574)
data from port
data from port
SDA
S
0
1
0
0
A2
A1
A0
1
A
DATA 1
A
DATA 4
1
P
start condition
READ FROM
PORT
R/W
acknowledge
from slave
acknowledge
from slave
stop
condition
Philips Semiconductors
Remote 8-bit I/O expander for I
2
C-bus
11
DATA INTO
PORT
t ph
INT
t iv
t ir
t ir
MBD975
DATA 2
DATA 3
t ps
DATA 4
Product specification
PCF8574
A LOW-to-HIGH transition of SDA, while SCL is HIGH is defined as the stop condition (P). Transfer of data can be stopped at any moment by a stop condition. When this occurs, data present
at the last acknowledge phase is valid (output mode). Input data is lost.
Fig.12 READ mode (input).
htdiwegap lluf ,koobdnah
PHILIPS [ NXP SEMICONDUCTORS ]
