Datasheet

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PCA9539_PCA9539R All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 8 — 26 November 2014 14 of 38 NXP Semiconductors
PCA9539; PCA9539R
16-bit I
2
C-bus and SMBus low power I/O port with interrupt and reset
Remark: 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). It
is assumed that the command byte has previously been set to ‘00’ (read input port register).
Fig 14. Read input port register, scenario 2
1101A1A01AS1
START condition
R/W
acknowledge
from slave
002aad729
A
SCL
SDA A
read from port 0
P
987654321
I0.xslave address
STOP condition
acknowledge
from master
A
I1.x
acknowledge
from master
A
I0.x
acknowledge
from master
1
I1.x
non acknowledge
from master
data into port 0
read from port 1
data into port 1
INT
t
v(INT_N)
t
rst(INT_N)
DATA 00 DATA 10 DATA 03 DATA 12
DATA 00 DATA 01
t
h(D)
t
h(D)
DATA 02
t
su(D)
DATA 03
t
su(D)
DATA 10 DATA 11 DATA 12