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?PCBMountedDigitalOutputTransducer
?CombinationTemperatureandPressure
?I
2
CorSPIProtocol
?Differential,Gage,Absolute&
Compound
?TemperatureCompensated
?3.3or5.0VdcSupplyVoltage
DESCRIPTION
The4525DOisasmall,ceramicbased,PCBmountedpressuretransducerfromMeasurement
Specialties.ThetransducerisbuiltusingMeasurementSpecialties’proprietaryUltraStable?processandthe
latestCMOSsensorconditioningcircuitrytocreatealowcost,highperformanceDigitalOutputPressure(14bit)
andTemperature(11bit)transducerdesignedtomeetthestrictestrequirementsfromOEMcustomers.
The4525DOisfullycalibratedandtemperaturecompensatedwithatotalerrorband(TEB)oflessthan
1.0%overthecompensatedpressurerange.Thesensoroperatesfromsinglesupplyofeither3.3or5.0Vdc.
Theruggedceramictransducerisavailableinsideport,topport,andmanifoldmountandcanmeasure
absolute,gauge,differentialorcompoundpressurefrom1to150psi.The1/8”barbedpressureportsmate
securelywith3/32”IDtubing.
FEATURESAPPLICATIONS
?PSIPressureRanges?FactoryAutomation
?PCBMountable?AltitudeandAirspeedMeasurements
?DigitalOutput?MedicalInstruments
?BarbedPressurePorts?LeakDetection
STANDARDRANGE(PSI)
PressureAbsoluteGaugeDifferentialCompound
1DS,SS,TP,MMDS,SS,TP,MMSS,TP
2DS,SS,TP,MMDS,SS,TP,MMSS,TP
5DS,SS,TP,MMDS,SS,TP,MMSS,TP
15SS,TPDS,SS,TP,MMDS,MMSS,TP
30SS,TPDS,SS,TP,MMDS,MMSS,TP
50SS,TPDS,SS,TP,MMDS,MMSS,TP
100SS,TPDS,SS,TP,MMDS,MMSS,TP
150SS,TPDS,SS,TP,MMDS,MMSS,TP
SeePackageConfigurations:DS=DualSidePort,SS=SingleSidePort,TP=TopPort
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BLOCKDIAGRAM
ABSOLUTEMAXIMUMRATINGS
ParameterConditionsMinMaxUnitNotes
SupplyVoltageT
A
=25°C2.75.7V
OutputCurrentT
A
=25°C3mA
VoltageonanyPinT
A
=25°C-0.3Vsupply+0.3V
StorageTemperature-40+125°C
HumidityT
A
=25°C95%RHNonCondensing
OverpressureT
A
=25°C,bothPorts300psi
BurstPressureT
A
=25°C,Port23XRange
ESDHBM-4+4kV
SolderTemperature250°C,5secmax.
ENVIRONMENTALSPECIFICATIONS
ParameterConditions
MechanicalVibrationMilSpec202F,Method213B,ConditionC,3Drops
MechanicalShockMilSpec202F,Method214A,Condition1E,1HrEachAxis
ThermalShock100CyclesoverStorageTemperature,30minutedwell
Life1MillionFSCycles
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PERFORMANCESPECIFICATIONS
SupplyVoltage
1
:5.0Vor3.3Vdc
ReferenceTemperature:25°C(unlessotherwisespecified)
PARAMETERSMINTYPMAXUNITSNOTES
PressureAccuracy-0.250.25%Span2
TotalErrorBand(TEB)-1.01.0%Span3,6
TemperatureAccuracy1.5oC4
SupplyCurrent3mA6
CompensatedTemperature-1085oC5
OperatingTemperature-25+105oC
OutputPressureResolution12ENOB
OutputTemperatureResolution7ENOB
ResponseTime1.5mS6
StartTimetoDataReady4.3mS
Weight3grams
MediaNon-CorrosiveDryGasesCompatiblewithSilicon,Pyrex,
RTV,Gold,Ceramic,Nickel,andAluminum
Notes
1.Outputisnotratiometrictosupplyvoltage.
2.Themaximumdeviationfromabestfitstraightline(BFSL)fittedtotheoutputmeasuredoverthepressurerangeat25C.Includesall
errorsduetopressurenonlinearity,hysteresis,andnonrepeatability.
3.Totalpressureerrorbandincludesallaccuracyerrors,thermalerrorsoverthecompensatedtemperaturerangeandspanandoffset
calibrationtolerances.Foridealsensoroutputwithrespecttoinputpressureandtemperature,referenceTransferFunctioncharts
below.
4.Themaximumdeviationfromabestfitstraightline(BFSL)fittedtotheoutputmeasuredoverthecompensatedtemperaturerange.
5.Forerrorsbeyondthecompensatedtemperaturerange,seeTemperatureErrorMultiplierchartbelow.
6.ThisproductcanbeconfiguredforcustomOEMrequirements,contactfactoryforlowerpowerconsumptionorhigheraccuracy.
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PressureandTemperatureTransferFunctionChart
0000
0666
2000
399A
3FFF
Output(Decimalcounts)
Pmin
Outp
ut(2
14
HEXcount
s)
Pma
x
Pressure
0333
3CCB
A
T
y
pe
B
T
y
p
e
=
__________
80%16383
PressureRange
Pressureapplied+10%16383
Output(Decimalcounts)=
__________
90%16383
PressureRange
Pressureapplied+5%16383
AType:
BType:
0
CC
199
266
333
400
4CC
599
666
733
7FF
Outp
ut(
2
11
H
E
Xc
o
u
n
ts
)
Temperature
-10°C-50°C150°C
Tmin
Tmax
Output(DecimalCounts)
(Output°C-(-50°C))
Tmin2047
(150°C
Tmax
-(-50°C))
Tmin
_________________________________
=
85°C
TemperatureErrorMultiplierChart
0.0
0.5
1.5
-25
2.0
-10520355065801095125
1.0
2.5
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PACKAGE,PINOUT,ANDPRESSURETYPECONFIGURATION
PinNamePinFunction
GND1Ground
SUPPLY2PositiveSupplyVoltage
SDAMISO3I2CDataSPIData
SCLSCLK4I2CClockSPIClock
INTSS5I2CInterruptSPIChipSelect
PressureTypePminPmaxDescription
Absolute
0psiA+PrangeOutputisproportionaltothedifferencebetween0psiA(Pmin)andpressureapplied
toPort1.
Differential
-Prange+PrangeOutputisproportionaltothedifferencebetweenPort1andPort2.Outputswings
positivewhenPort1>Port2.Outputis50%oftotalcountswhenPort1=Port2.
Gauge
0psiG+PrangeOutputisproportionaltothedifferencebetween0psiG(Pmin)andPort1.Output
swingspositivewhenPort1>Port2.
Compound
-15psiG+PrangeOutputisproportionaltothedifferencebetween-15psiGpressure(Pmin)and
pressureappliedtoPort1.
Prangeisequaltothemaximumfullscalepressurespecifiedintheorderinginformation.
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ORDERINGINFORMATION
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DIMENSIONS
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I2CandSPIINTERFACESpecifications
1.I2CinterfaceSpecification
Theserialinterfaceofthe4515DO/4525DOseriesisoptimizedintermsofsensorreadoutandpower
consumptionwhenthefactorysettingforI2C.FordetailedspecificationsoftheI2Cprotocol,seeTheI2CBus
Specification,Version2.1,January2000.
1.1Interfaceconnection-external
Bi-directionalbuslinesareimplementedbythedevices(masterandslave)usingopen-drainoutputstages
andapull-upresistorconnectedtothepositivesupplyvoltage.Therecommendedpull-upresistorvalue
dependsonthesystemsetup(capacitanceofthecircuitorcableandbusclockfrequency).Inmostcases,1k?
isareasonablechoice.ThecapacitiveloadsonSDAandSCLlinehavetobethesame.Itisimportanttoavoid
asymmetriccapacitiveloads.
1.2I2CAddress
TheI2Caddressconsistsofa7-digitbinaryvalue.ThefactorysettingforI2Cslaveaddressis0x28,0x36or
0x46dependingontheinterfacetypeselectedfromtheorderinginformation.Theaddressisalwaysfollowedby
awritebit(0)orreadbit(1).ThedefaulthexadecimalI2Cheaderforreadaccesstothesensoristherefore0x51,
0x6D,0x8Drespectively,basedontheorderinginformation.
1.3INT/SSpin
WhenprogrammedasanI2Cdevice,theINT/SSpinoperatesasaninterrupt.TheINT/SSpinriseswhen
newoutputdataisreadyandfallswhenthenextI2Ccommunicationoccurs.Itismostusefulifthepartis
configuredinSleepModetoindicatetothesystemthatanewconversionisready.
1.4Transfersequences
TransmissionSTARTCondition(S):TheSTARTconditionisauniquesituationonthebuscreatedbythe
master,indicatingtotheslavesthebeginningofatransmissionsequence(thebusisconsideredbusyaftera
START).
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TransmissionSTOPCondition(P):TheSTOPconditionisauniquesituationonthebuscreatedbythe
master,indicatingtotheslavestheendofatransmissionsequence(thebusisconsideredfreeafteraSTOP).
Acknowledge(ACK)/NotAcknowledge(NACK):Eachbyte(8bits)transmittedovertheI2Cbusisfollowed
byanacknowledgeconditionfromthereceiver.ThismeansthatafterthemasterpullsSCLlowtocompletethe
transmissionofthe8thbit,SDAwillbepulledlowbythereceiverduringthe9thbittime.Ifaftertransmissionof
the8thbitthereceiverdoesnotpulltheSDAlinelow,thisisconsideredtobeaNACKcondition.
IfanACKismissingduringaslavetomastertransmission,theslaveabortsthetransmissionandgoesintoidle
mode.
Handshakeprocedure(HoldMaster):Inamaster-slavesystem,themasterdictateswhentheslaveswill
receiveortransmitdata.However,insomesituationsaslavedevicemayneedtimetostorereceiveddataor
preparedatatobetransmitted.Therefore,ahandshakeprocedureisrequiredtoallowtheslavetoindicate
terminationofinternalprocessing
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1.5Datatransferformat
DataistransferredinbytepacketsintheI2Cprotocol,whichmeansin8-bitframes.Eachbyteisfollowedby
anacknowledgebit.Dataistransferredwiththemostsignificantbit(MSB)first.
AdatatransfersequenceisinitiatedbythemastergeneratingtheStartcondition(S)andsendingaheaderbyte.
TheI2Cheaderconsistsofthe7-bitI2Cdeviceaddressandthedatadirectionbit(R/_W).
ThevalueoftheR/_Wbitintheheaderdeterminesthedatadirectionfortherestofthedatatransfersequence.
IfR/_W=0(WRITE)thedirectionremainsmaster-to-slave,whileifR/_W=1(READ)thedirectionchangesto
slave-to-masteraftertheheaderbyte.
1.6CommandSetanddataTransferSequences
TheI2Cmastercommandstartswiththe7bitslaveaddresswiththe8thbit=1(READ).Thesensorasthe
slavesendsanacknowledge(ACK)indicatingsuccess.ThesensorhasfourI2Creadcommands:Read_MR,
Read_DF2,Read_DF3,andRead_DF4.Figure1.6showsthestructureofthemeasurementpacketforthreeof
thefourI2Creadcommands,whichareexplainedinsections1.6.1and1.6.2
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Figure1.6–I2CMeasurementPacketReads
1.6.1I2CRead_MR(MeasurementRequest)
TheRead_MR(seeexample1inFigure1.6)communicationcontainsonlytheslaveaddressandtheREAD
bit(1)sentbythemaster.AfterthesensorrespondswiththeslaveACK,themastermustcreateastop
condition.ThisisonlyusedinSleepMode(seesection3.1.2)towakeupthedeviceandstartacomplete
measurementcycle(includingthespecialmeasurements)followedbytheDSPcalculationsandwritingthe
resultstothedigitaloutputregister.
Note:TheI2CRead_MRfunctioncanalsobeaccomplishedusingtheI2CRead_DF2orRead_DF3
commandandignoringthe“stale”datathatwillbereturned.
1.6.2I2CRead_DF(DataFetch)
ForDataFetchcommands,thenumberofdatabytesreturnedbythesensorisdeterminedbywhenthe
mastersendstheNACKandstopcondition.FortheRead_DF3datafetchcommand(DataFetch3Bytes;see
example3inFigure1.6),thesensorreturnsthreebytesinresponsetothemastersendingtheslaveaddress
andtheREADbit(1):twobytesofbridgedatawiththetwostatusbitsastheMSBsandthen1byteof
temperaturedata(8-bitaccuracy).Afterreceivingtherequirednumberofdatabytes,themastersendsthe
NACKandstopconditiontoterminatethereadoperation.FortheRead_DF4command,themasterdelays
sendingtheNACKandcontinuesreadinganadditionalfinalbytetoacquirethefullcorrected11-bittemperature
measurement.Inthiscase,thelast5bitsofthefinalbyteofthepacketareundeterminedandshouldbe
maskedoffintheapplication.TheRead_DF2commandisusedifcorrectedtemperatureisnotrequired.The
masterterminatestheREADoperationafterthetwobytesofbridgedata(seeexample2inFigure1.6).
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2.SPIinterfaceSpecification
TheSPIinterfaceofsensormustbeprogrammedforfalling-edgeMISOchange.
2.1SPIRead_MR(MeasurementRequest)
AspecialSPIRead_MRcommandisusedforwakingupthepartinSleepMode.Itperformsameasurement
cycleincludingthespecialmeasurementsandacorrectioncalculation.TheSPIRead_MRcommandonly
requiresthattheSSlinebedroppedlowforaminimumof8μsthenraisedhighagain.TheriseofSSwilltrigger
theparttopowerupandperformthemeasurements.
Figure2.1–SPIRead_MR
Note:TheSPIRead_MRfunctioncanalsobeaccomplishedusingtheSPIRead_DFcommandand
ignoringthe“stale”datathatwillbereturned.
2.2SPIRead_DF(DataFetch)
Forsimplifyingexplanationsandillustrations,onlyfallingedgeSPIpolaritywillbediscussedinthefollowing
sections.TheSPIinterfacewillhavedatachangeafterthefallingedgeofSCLK.Themastershouldsample
MISOontheriseofSCLK.Theentireoutputpacketis4bytes(32bits).Thehighbridgedatabytecomesfirst,
followedbythelowbridgedatabyte.Then11bitsofcorrectedtemperature(T[10:0])aresent:firstthe
T[10:3]byteandthenthe{T[2:0],xxxxx}byte.Thelast5bitsofthefinalbyteareundeterminedandshouldbe
maskedoffintheapplication.Iftheuseronlyrequiresthecorrectedbridgevalue,thereadcanbeterminated
afterthe2ndbyte.Ifthecorrectedtemperatureisalsorequiredbutonlyatan8-bitresolution,thereadcanbe
terminatedafterthe3rdbyteisread.
Figure2.2–SPIOutputPacketwithFallingEdgeSPI_Polarity
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TIMINGDIAGRAMS
I2CTimingDiagram
SPITimingDiagram
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Theinformationinthissheethasbeencarefullyreviewedandisbelievedtobeaccurate;however,noresponsibilityisassumedfor
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