Datasheet

APPLICATIONINFORMATION
A2
A1
SDA
SCL
INT
GND
P6
P0
P1
P2
P3
P4
P5
P7
INT
GND
V
C
C
V
CC
(5 V)
V
C
C
10 kW 10 kW
10 kW
2 kW
100 k
W
(y3)
Master
Controller
PCA9554
INT
RESET
Subsystem 2
(e.g., counter)
Subsystem 3
(e.g., alarm system)
ALARM
Controlled Device
(e.g., CBT device)
ENABLE
A
B
V
C
C
Subsystem 1
(e.g., temperature sensor)
SDA
SCL
A0
PCA9554
SCPS128B–JULY2006–REVISEDAUGUST2008........................................................................................................................................................ www.ti.com
Figure14showsanapplicationinwhichthePCA9554canbeused.
A.Deviceaddressisconfiguredas0100000forthisexample.
B.P0,P2,andP3areconfiguredasoutputs.
C.P1,P4,andP5areconfiguredasinputs.
D.P6andP7arenotusedandandhaveinternal100-kΩpullupresistorstoprotectthemfromfloating.
Figure14.TypicalApplication
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ProductFolderLink(s):PCA9554
Not Recommended for New Designs