Datasheet

1
FEATURES
DB, DBQ, DGV, DW, OR PW PACKAGE
(TOP VIEW)
INT
A1
A2
P00
P01
P02
P03
P04
P05
P06
P07
GND
V
C
C
SDA
SCL
A0
P17
P16
P15
P14
P13
P12
P11
P10
1
2
3
4
5
6
7
8
9
10
1
1
12
24
23
22
21
20
19
18
17
16
15
14
13
24 23 22 21 20
7
8 9 10 11
1
2
3
4
5
6
18
17
16
15
14
13
RGE PACKAGE
(TOP VIEW)
A2
A1
INT
P10
P11 SDA
P06
P07
GND
V
CC
19
SCL
12
P12
P00
P01
P02
P03
P04
P05
A0
P17
P16
P15
P14
P13
DESCRIPTION/ORDERINGINFORMATION
PCA9555
www.ti.com
.........................................................................................................................................................SCPS131EAUGUST2005REVISEDMAY2008
REMOTE16-BITI
2
CANDSMBusI/OEXPANDER
WITHINTERRUPTOUTPUTANDCONFIGURATIONREGISTERS
LowStandby-CurrentConsumptionofPolarityInversionRegister
1µAMax
LatchedOutputsWithHigh-CurrentDrive
I
2
CtoParallelPortExpanderCapabilityforDirectlyDrivingLEDs
Open-DrainActive-LowInterruptOutputLatch-UpPerformanceExceeds100mAPer
JESD78,ClassII
5-VTolerantI/OPorts
ESDProtectionExceedsJESD22
CompatibleWithMostMicrocontrollers
2000-VHuman-BodyModel(A114-A)
400-kHzFastI
2
CBus
200-VMachineModel(A115-A)
AddressbyThreeHardwareAddressPinsfor
UseofuptoEightDevices1000-VCharged-DeviceModel(C101)
This16-bitI/Oexpanderforthetwo-linebidirectionalbus(I
2
C)isdesignedfor2.3-Vto5.5-VV
CC
operation.It
providesgeneral-purposeremoteI/OexpansionformostmicrocontrollerfamiliesviatheI
2
Cinterface[serialclock
(SCL),serialdata(SDA)].
ThePCA9555consistsoftwo8-bitConfiguration(inputoroutputselection),InputPort,OutputPort,andPolarity
Inversion(activehighoractivelowoperation)registers.Atpoweron,theI/Osareconfiguredasinputs.The
systemmastercanenabletheI/OsaseitherinputsoroutputsbywritingtotheI/Oconfigurationbits.Thedatafor
eachinputoroutputiskeptinthecorrespondingInputorOutputregister.ThepolarityoftheInputPortregister
canbeinvertedwiththePolarityInversionregister.Allregisterscanbereadbythesystemmaster.
ThesystemmastercanresetthePCA9555intheeventofatimeoutorotherimproperoperationbyutilizingthe
power-onresetfeature,whichputstheregistersintheirdefaultstateandinitializestheI
2
C/SMBusstatemachine.
ThePCA9555open-draininterrupt(INT)outputisactivatedwhenanyinputstatediffersfromitscorresponding
InputPortregisterstateandisusedtoindicatetothesystemmasterthataninputstatehaschanged.
INTcanbeconnectedtotheinterruptinputofamicrocontroller.Bysendinganinterruptsignalonthisline,the
remoteI/Ocaninformthemicrocontrollerifthereisincomingdataonitsportswithouthavingtocommunicatevia
theI
2
Cbus.Thus,thePCA9555canremainasimpleslavedevice.
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2005–2008,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Not Recommended for New Designs

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