Datasheet

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PCA8575_2 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 02 — 21 March 2007 9 of 30 NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I
2
C-bus with interrupt
Transfer of data can be stopped at any moment by a STOP condition. When this occurs, data present at the latest acknowledge phase is valid (output mode).
Fig 12. Read input port register, scenario 1
1 0 0 A2 A1 A0 1 AS0
START condition R/W
acknowledge
from slave
002aab810
A
acknowledge
from master
SCL
SDA
A
read from port 0
data into port 0
INT
A 1
no acknowledge
from master
P
DATA 10 DATA 12
t
v(D)
t
d(rst)
987654321
P0x
DATA 00
acknowledge
from master
P1x
DATA 11
P0x
DATA 00
acknowledge
from master
P1x
DATA 12
data into port 1
DATA 00
read from port 1
DATA 11