Datasheet

APPLICATIONINFORMATION
A2
A1
SDA
SCL
INT
GND
P6
P0
P1
P2
P3
P4
P5
P7
INT
GND
V
CC
V
C
C
(5 V)
V
CC
10 k
W 10 kW
10 kW
2 kW
Master
Controller
PCA9554A
INT
RESET
Subsystem 2
(e.g., Counter)
Subsystem 3
(e.g., Alarm System)
ALARM
Controlled Device
(e.g., CBT Device)
ENABLE
A
B
V
CC
Subsystem 1
(e.g., Temperature Sensor)
SDA
SCL
A0
PCA9554A
SCPS127D–SEPTEMBER2006–REVISEDAUGUST2008........................................................................................................................................... www.ti.com
Figure14showsanapplicationinwhichthePCA9554Acanbeused.
A.Deviceaddressisconfiguredas0111000forthisexample.
B.P0,P2,andP3areconfiguredasoutputs.
C.P1,P4,andP5areconfiguredasinputs.
D.P6andP7arenotusedandhaveinternal100-kΩpullupresistorstoprotectthemfromfloating.
Figure14.TypicalApplication
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Not Recommended for New Designs