Datasheet

PCA9554_9554A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 9 — 19 March 2013 4 of 35
NXP Semiconductors
PCA9554; PCA9554A
8-bit I
2
C-bus and SMBus I/O port with interrupt
4. Block diagram
All I/Os are set to inputs at reset.
Fig 1. Block diagram of PCA9554/PCA9554A
PCA9554/PCA9554A
POWER-ON
RESET
002aac492
I
2
C-BUS/SMBus
CONTROL
INPUT
FILTER
SCL
SDA
V
DD
INPUT/
OUTPUT
PORTS
IO0
V
SS
8-bit
write pulse
read pulse
IO2
IO4
IO6
IO1
IO3
IO5
IO7
LP
FILTER
V
DD
INT
A0
A1
A2