Datasheet

APPLICATIONINFORMATION
P00
P01
P02
P03
P04
P05
A2
A1
A0
A
B
P06
P07
P10
P1
1
P12
P13
P14
P15
P16
P17
V
C
C
V
CC
V
CC
(5 V)
Controlled Switch
(e.g., CBT Device)
GND
INT
SDA
SCL
10 kW 10 k
W 10 kW 10 kW
2 kW
INT
Subsystem 1
(e.g., Temperature
Sensor)
Subsystem 2
(e.g., Counter)
PCA9555
SDA
SCL
INT
GND
Keypad
ALARM
RESET
ENABLE
Subsystem 3
(e.g., Alarm)
Master
Controller
4
5
6
7
8
9
10
1
1
13
14
15
16
17
18
19
20
22
23
1
3
2
21
12
24
V
C
C
PCA9555
SCPS131E–AUGUST2005–REVISEDMAY2008......................................................................................................................................................... www.ti.com
Figure15showsanapplicationinwhichthePCA9555canbeused.
A.Deviceaddressisconfiguredas0100100forthisexample.
B.P00,P02,andP03areconfiguredasoutputs.
C.P01,P04–P07,andP10–P17areconfiguredasinputs.
D.PinnumbersshownareforDB,DBQ,DGV,DW,andPWpackages.
Figure15.TypicalApplication
22SubmitDocumentationFeedbackCopyright©2005–2008,TexasInstrumentsIncorporated
ProductFolderLink(s):PCA9555
Not Recommended for New Designs