Datasheet

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PCA9555_8 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 08 — 22 October 2009 10 of 34 NXP Semiconductors
PCA9555
16-bit I
2
C-bus and SMBus I/O port with interrupt
Fig 10. Write to Output port registers
1 0 0 A2 A1 A0 0 AS0
START condition R/W acknowledge
from slave
002aac220
A
SCL
SDA A
write to port
data out
from port 0
P
t
v(Q)
987654321
command byte
data to port 0
DATA 0
slave address
00000100
STOP
condition
0.00.7
acknowledge
from slave
acknowledge
from slave
data to port 1
DATA 1 1.01.7
A
data out
from port 1
t
v(Q)
DATA VALID
Fig 11. Write to Configuration registers
1 0 0 A2 A1 A0 0 AS0
START condition R/W acknowledge
from slave
002aac221
A
SCL
SDA A P
987654321
command byte
data to register
DATA 0
slave address
00001100
STOP
condition
LSBMSB
acknowledge
from slave
acknowledge
from slave
data to register
DATA 1
LSBMSB
A