Datasheet

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PCAL6416A All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 6 — 9 October 2014 23 of 61 NXP Semiconductors
PCAL6416A
Low-voltage translating 16-bit I
2
C-bus/SMBus I/O expander
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).
This figure eliminates the command byte transfers and a restart between the initial slave address call and actual data transfer from P port (see Figure 14
).
Fig 17. Read input port register (latch enabled), scenario 3
10000
AD
DR
1
AS0
START condition
R/W
acknowledge
from slave
002aah054
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)
t
rst(INT)
DATA 01 DATA 10 DATA 02 DATA 11
DATA 01
t
h(D)
DATA 02
t
su(D)
DATA 01
DATA 10 DATA 11 DATA 10