BMP085

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Technical content

Rev.f1.2f Pagef1f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f f BMP085 Data sheet Order code 0 273 300 144 Data sheet revision 1.2 Release date 15 Oct 2009 Document number BST-BMP085-DS000-05 Notes ThefBMP085fdigitalfpressurefsensorfisffunctionallyf compatibleftofthefexistingfBoschf Sensortecf SMD500f digitalf pressuref sensor.f Productf photosf andf picturesf aref forf illustrationfpurposesfonlyfandfmayfdifferffromfthefrealfproduct’sfappearance.f Specificationsfarefsubjectftofchangefwithoutfnotice.f BMP085f Digitalfpressurefsensorf f Datafsheet

Rev.f1.2f Pagef2f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f BMP085 Digital pressure sensor Key features f DDA )f f LCC8fpackage:f f Robust,fceramicflead8lessfchipfcarri erf(LCC)fpackagef f f f f Smallffootprint:ff 5.0mmfxf5.0mmf f f f f Super8flat:ff f 1.2mmfheightf f Lowfpower:f f f 5µAfatf1fsamplef/fsec.finfstandardfmod ef f Lowfnoise:f f f 0.06hPaf(0.5m)finfultraflowfpowerfmode f f f f f 0.03hPaf(0.25m)fultrafhighfresolutionfmodef f f f f downftof0.1mf(rmsfnoise)fpossiblef f 8fTemperaturefmeasurementfincludedf 8fI 2Cfinterfacef 8fFullyfcalibratedf 8fPb8free,fhalogen8freefandfRoHSfcompliant,f 8fMSLf1f f f f New features comparison f f f f f f f BMP085 SMD500 Smallerfpackagefheightff f f f 1.2mmf f f 1.55mmf Fasterfconversionftimef(standardfmodefeach)f 7.5msf( max.)f f 34msff FasterfI 2Cfdataftransferf f f f max.f3.4MHzf f max.f400kHzf Lowerfstand8byfcurrentf(typ.)f f f f 0.1µAf f f 0.7µAf Externalfclockff f f f f notfnecessaryff necessaryf Typical applications

• EnhancementfoffGPSfnavigationf(dead8reckoning,fslopefdetection,fetc.)f
• In8fandfout8doorfnavigationf
• Leisurefandfsportsf
• Weatherfforecastf
• Verticalfvelocityfindicationf(rise/sinkfspeed)f f

Rev.f1.2f Pagef3f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f BMB085 general description Thef BMP085f isf thef fullyf pin8f andf functionf compatiblef successorf off thef SMD500,f af newf generationfoffhighfprecisionfdigitalfpressurefsenso rsfforfconsumerfapplications.fThefuniversalf C8codefSMD500/BMP085f(“ BMP085_SMD500_API”) isffullyfupwardfcompatibleftofSMD500fandf recognizesfautomaticallyfthefdevicefID.fCustomersfa lreadyfworkingfwithfthefSMD500fpressuref sensorf aref invitedf tof contactf Boschf Sensortecf asf soonf asf theyf intendf tof switch8overf tof thef BMP085fsensorfforfgettingffirst8handfsupport.f f Thef ultra8lowf power,f lowf voltagef electronicsf off thef BMP085f isf optimizedf forf usef inf mobilef phones,f PDAs,f GPSf navigationf devicesf andf outdoorf equipment.f Withf af lowf altitudef noisef off merelyf 0.25mf atf fastf conversionf time,f thef BMP085f of fersf superiorf performance.f Thef I 2Cf interfacefallowsfforfeasyfsystemfintegrationfwithfafmicrocontroller.ff f ThefBMP085fisfbasedfonfpiezo8resistiveftechnologyfforfEMCfrobustness,fhighfaccuracyfandflinearityf asfwellfasflongftermfstability.ff f RobertfBoschfisfthefworldfmarketfleaderfforfpressurefsensorsfinfautomotivefapplications.fBasedf onf thef experiencef off overf 200fmillionf pressuref sensorsf inf thef field,f thef BMP085f continuesf af newfgenerationfoffmicro8machinedfpressurefsensors.f

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1 Electrical characteristics

Iffnotfstatedfotherwise,fthefgivenfvaluesfarefmaxim umfvaluesfoverftemperature/voltagefrangef infthefgivenfoperationfmode. f f Parameter Symbol Condition Min Typ Max Units operationalf 840f f +85f Operatingftemperature f TAf fullfaccuracyf 0f f +65f °Cf VDD f ripplefmax.f50mVppf 1.8f 2.5f 3.6f Vf Supplyfvoltageff VDDIO f f 1.62f 2.5f 3.6f Vf IDDLOWf ultraflowfpowerfmodef f 3f f µAf IDDSTDf standardfmodef f 5f f µAf IDDHRf highfresolutionfmodef f 7f f µAf Supplyfcurrentff @ff1fsamplef/fsec.f 25°Cf I DDUHR f ultrafhighfres.fmodef f 12f f µAf Peakfcurrentf I peak f duringfconversionf f 650f 1000f µAf Standbyfcurrentf I DDSBMf atf25°Cf f 0.1f f µAf Serial fdata fclockf f SCLf f f f 3.4f MHzf Conversionftimef temperaturef t C_tempf standardfmodef f 3f 4.5f msf tc_p_low f ultraflowfpowerfmodef f 3f 4.5f msf tc_p_stdf standardfmodef f 5f 7.5f msf tc_p_hrf highfresolutionfmodef f 9f 13.5f msf Conversionftimef pressuref t c_p_luhr f ultrafhighfres.fmodef f 17f 25.5f msf f 700f.f.f.ff1100fhPaf f 300f.f.f.f700fhPaf 0f.f.f.f+65f°Cf 83.0f ±1.0f +3.0f hPaf Absolutefaccuracyf pressuref V DD f=f3.3Vf f 300f.f.f.ff1100fhPaf 820f.f.f.f0f°Cf 84.0f ±1.5f +4.0f hPaf f pressuref f 0.01f f hPafResolutionfoff outputfdataf f temperaturef f 0.1f f °Cf f 700f.f.f.f1100fhPaf @f25f°Cf f ±0.2f f hPafRelativefaccuracyf pressuref V Noisefinfpressuref f seeftablefonfpagef10f @f25f°Cf 81.5f ±0.5f +1.5f °CfAbsolutefaccuracyf temperaturef V DD f=f3.3Vff f

Rev.f1.2f Pagef7f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f Solderfdriftsf f Minimumfsolderfheightf 50µmf f ±1.0f f hPaf Longftermfstabilityf f 12fmonthsf f ±1.0f f hPaf f f f

2 Absolute maximum ratings

f Parameter Condition Min Max Units Storageftemperaturef f 840f +85f °Cf Supplyfvoltagef allfpinsf 80.3f +4.25f Vf ESDfratingff HBM,fRf=f1.5kΩ,f Cf=f100pFf f ±2f kVf Overpressuref f f 10,000f hPaf f ThefBMP085fhasftofbefhandledfasfElectrostaticfSensitivefDevicef(ESD).fffffffffff f f f f

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3 Operation

3.1 General description

ThefBMP085fisfdesignedftofbefconnectedfdirectlyftofafmicrocontrollerfoffafmobilefdevicefviafthef I 2Cfbus.fThefpressurefandftemperaturefdatafhasftofbef compensatedfbyfthefcalibrationfdatafoff thefE2PROMfoffthefBMP085.f f

3.2 General function and application schematics

ThefBMP085fconsistsfoffafpiezo8resistivefsensor,fan fanalogftofdigitalfconverterfandfafcontrolf unitfwithfE 2PROMfandfafserialfI 2Cfinterface.fThefBMP085fdeliversfthefuncompensatedfvaluefoff pressurefandftemperature.fThefE2PROMfhasfstoredf176fbitfoffindividualfcalibrationfdata.fThisfisf usedftofcompensatefoffset,ftemperaturefdependencefandfotherfparametersfoffthefsensor.f f

• UPf=fpressurefdataf(16ftof19fbit)f
• UTf=ftemperaturefdataf(16fbit)f f

Rev.f1.2f Pagef9f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f Note:f (1)fPull8upfresistorsfforfI f Sensorf elementf E2PROMff ADCf f Controlff Unitf BMP085 SCL f SDA f GND f VDDDf Rp (1) f Rp (1) f XCLR f f Displayf 100nF VDDAf EOC f µControllerf e.fg.f8fbitf f f f f f I 2Cfinterfacef f Typicalfapplicationfcircuit:f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f Note:f ThefBMP085fcanfbefsuppliedfindependentlyfwithfdiffe rentflevelsfoffV DDA fandfV DDD ,fwhichfisfnotf possiblefwithfthefSMD500.fInfcasefoffdifferentfvoltageflevels,fVDDA fandfV DDDf shallfhavefaf100nFf decouplingfcapacitorfeach. f f

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3.3 Measurement of pressure and temperature

f Forf allf calculationsf presentedf heref anf ANSIfCf codef isf availablef fromf Boschf Sensortecf BMP085_SMD500_API”). f f Thefmicrocontrollerfsendsfafstartfsequenceftofstartf af pressuref orf temperaturef measurement.f Afterf convertingf time,f thef resultf valuef (UPf orf UT,f respectively)fcanfbefreadfviafthefI 2Cfinterface.fForf calculatingftemperaturefinf°CfandfpressurefinfhPa,f thef calibrationf dataf hasf tof bef used.f Thesef constantsf canf bef readf outf fromf thef BMP085f E 2PROMf viaf thef I 2Cf interfacef atf softwaref initialization.f f Thef samplingf ratef canf bef increasedf upf tof 128f samplesfperfsecondf(standardfmode)fforfdynamicf measurement.f Infthisf case,f itf isf sufficientf tof measuref thef temperaturef onlyf oncef perf secondf andf tof usef thisf valuef forf allf pressuref measurementsfduringfthefsamefperiod.f f Byfusingfdifferentfmodesfthefoptimumfcompromisef betweenf powerf consumption,f speedf andf resolutionfcanfbefselected,fseefbelowftable.ff f f f f f OverviewfoffBMP085fmodes,fselectedfbyfdriverfsoftwarefviafthefvariablef oversampling_setting :f f Modef f Parameterf oversampling_setting Internalf numberfoff samplesf Conversionf timefpressuref max.f[ms]f Avg.fcurrentff @f1fsample/sf typ.f[µA]f RMSfnoise f typ.f[hPa]f RMSfnoise f typ.f[m]f ultraflowfpowerf f 0f 1f 4.5f 3f 0.06f 0.5f standard f f 2f 7.5f 5f 0.05f 0.4f highfresolutionf f f 4f 13.5f 7f 0.04f 0.3f ultrafhighf resolutionf f f 8f 25.5f 12f 0.03f 0.25f f Thefnoisefdatafisfcalculatedfasfstandardfdeviationf off10fdatafpoints.fForffurtherfinformationfonf noisefcharacteristicsfseefthefrelevantfapplicationfnotef“Noisefinfpressurefsensorfapplications”.f f Startftemperaturef measurement ReadfUTf Startfpressuref measurementf ReadfUPf Start Calculatefpressurefandf temperaturefinfphysicalf unitsf waitf4.5msf waitf(dependsfonfmode,fseefbelow)f

Rev.f1.2f Pagef11f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f Allf modesf canf bef performedf atf higherf speeds,f e.g.f upftof128ftimesfperfsecondfforfstandardf mode,fwithfthefcurrentfconsumptionfincreasingfpropo rtionallyftofthefsamplefrate.fThisfwayfthef noisefcanfbefdecreasedffurtherfbyfsoftwarefaveraging.f

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3.4 Calibration coefficients

f Thef 176fbitf E 2PROMf isf partitionedf inf 11f wordsf off 16fbitf each.f Thesef containf 11f calibrationf coefficients.f Everyf sensorf modulef hasf individualf coefficients.f Beforef thef firstf calculationf off temperaturefandfpressure,fthefmasterfreadsfoutfthefE2PROMfdata.f Thefdatafcommunicationfcanfbefcheckedfbyfcheckingfthatfnonefoffthefwordsfhasfthefvaluef0forf 0xFFFF.f f ff BMP085 reg adr Parameter MSB LSB AC1f 0xAAf 0xABf AC2f 0xACf 0xADf AC3f 0xAEf 0xAFf AC4f 0xB0f 0xB1f AC5f 0xB2f 0xB3f AC6f 0xB4f 0xB5f B1f 0xB6f 0xB7f B2f 0xB8f 0xB9f MBf 0xBAf 0xBBf MCf 0xBCf 0xBDf MDf 0xBEf 0xBFf

3.5 Calculating pressure and temperature

Thefmodef(ultraflowfpower,fstandard,fhigh,fultrafhighfresolution)fcanfbefselectedfbyfthefvariablef oversampling_setting (0,f1,f2,f3)finfthefCfcode.ff f Thef universalf codef SMD500/BMP085f isf fullyf upwardf compatiblef tof SMD500f andf recognizesf automaticallyf thef devicef ID.f Thus,f thef SMD500f canf bef replacedf "onf thef fly"f byf thef BMP085f withoutfchangingfhardwareforfsoftware.f f Calculationf off truef temperaturef andf pressuref inf stepsf off 1Paf (=f0.01hPaf =f 0.01mbar)f andf temperaturefinfstepsfoff0.1°C.f f Theffollowingffigurefshowsfthefdetailedfalgorithmfforfpressurefandftemperaturefmeasurement.ff f Thisf algorithmf isf availableftofcustomersfasfreferencefCfsourcefcodef(“ BMP085_SMD500_API”) fromfBoschfSensortecfandfviafitsfsalesfandfdistribu tionfpartners.f Please contact your Bosch Sensortec representative for details. f f f f f f f

Rev.f1.2f Pagef13f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f f f f f f f f Calculation of pressure and temperature for BMP085 C code function: type: bmp085_get_cal_param AC1 (0xAA, 0xAB) (16 bit) AC1 = 408 short AC2 (0xAC, 0xAD) (16 bit) AC2 = -72 short AC3 (0xAE, 0xAF) (16 bit) AC3 = -14383 short AC4 (0xB0, 0xB1) (16 bit) AC4 = 32741 unsigned short AC5 (0xB2, 0xB3) (16 bit) AC5 = 32757 unsigned short AC6 (0xB4, 0xB5) (16 bit) AC6 = 23153 unsigned short B1 (0xB6, 0xB7) (16 bit) B1 = 6190 short B2 (0xB8, 0xB9) (16 bit) B2 = 4 short MB (0xBa, 0xBB) (16 bit) MB = -32768 short MC (0xBC, 0xBD) (16 bit) MC = -8711 short MD (0xBE, 0xBF) (16 bit) MD = 2868 short bmp085_get_ut UT = 27898 long oss = 0 = oversampling_setting short (0 .. 3) (ultra low power mode) bmp085_get_up UP = 23843 long bmp085_get_temperature X1 = (UT - AC6) * AC5 / 2 1 5 X1 = 4743 long X2 = MC * 2 11 / (X1 + MD) X2 = -2344 long B5 = X1 + X2 B5 = 2399 long T = (B5 + 8) / 2 T = 150 temp in 0.1° C long BMP085_calpressure B6 = B5 - 4000 B6 = -1601 long X1 = (B2 * (B6 * B6 / 2 12 )) / 2 11 X1 = 1 long X2 = AC2 * B6 / 2 X2 = 56 long X3 = X1 + X2 X3 = 57 long B3 = ((AC1*4+X3) << oss + 2) / 4 B3 = 422 long X1 = AC3 * B6 / 2 13 X1 = 2810 long )) / 2 X2 = 59 long X3 = 717 long B4 = AC4 * (unsigend long)(X3 + 32768) / 2 15 B4 = 33457 unsigned long B7 = ((unsigned long)UP - B3) * (50000 >> oss) B7 = 1 171050000 unsigned long if (B7 < 0x80000000) { p = (B7 * 2) / B4 } p = 70003 long else { p = (B7 / B4) * 2 } long X1 = (p / 2 ) * (p / 2 ) X1 = 74529 long X1 = (X1 * 3038) / 2 16 X1 = 3454 long X2 = -7859 long p = p + (X1 + X2 + 3791) / 2 4 p = 69964 press. in Pa long display temperature and pressure value calculate true pressure calculate true temperature read uncompensated pressure value write 0x34+(oss<<6) into reg 0xF4, wait read reg 0xF6 (MSB), 0xF7 (LSB), 0xF8 (XLSB) example: Read calibration data from the E PROM of the BMP085 read out E 2PROM registers, 16 bit, MSB first read uncompensated temperature value UT = MSB << 8 + LSB UP = (MSB<<16 + LSB<<8 + XLSB) >> (8-oss) write 0x2E into reg 0xF4, wait 4.5ms read reg 0xF6 (MSB), 0xF7 (LSB) Start

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3.6 Calculating absolute altitude

Withfthefmeasuredfpressuref p fandfthefpressurefatfseaflevelf p 0fe.g.f1013.25hPa,fthefaltitudefinf metersfcanfbefcalculatedfwithfthefinternationalfbarometricfformula:f f f Thus,fafpressurefchangefoff∆p f=f1hPafcorrespondsftof8.43mfatfseaflevel f f f f f

3.7 Calculating pressure at sea level

Withf thef measuredf pressuref p f andf thef absolutef altitudef thef pressuref atf seaf levelf canf bef calculated:f f Thus,fafdifferencefinfaltitudefoff∆altitudef=f10mfcorrespondsftof1.2hPafpressurefchangefatfseaf level.f f 255. 50 44330 altitudef 8 f 1 pffp 5.255 pf 81f * f44330ffaltitude

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4 I2C Interface

• I2Cfisfafdigitalftwofwirefinterfacef
• Clockffrequenciesfupftof3.4Mbit/sec.f(I 2Cfstandard,ffastfandfhigh8speedfmodefsupported)f
• SCLfandfSDAfneedsfafpull8upfresistor,ftyp.f4.7kOhmftofV DDDff (onefresistorfeachfforfallfthefI 2Cfbus)f f Thef I 2Cf busf isf usedf tof controlf thef sensor,f tof readf calibrationf dataf fromf thef E2PROMf andf tof readfthef measurementf dataf whenf A/Df conversionf isf finished.f SDAf (serialf data)f andf SCLf (serialfclock)fhavefopen8drainfoutputs.f f ForfdetailedfI 2C8busfspecificationfpleasefreferfto:f http://www.nxp.com/acrobat_download/literature/9398/39340011.pdf f f f ThefBMP085fhasfafmasterfclearf(XCLR)flow8activefinputfthatfisfusedftofresetfthefBMP085fandf initializesfinternalfregistersfandfcounters.fThefde vicefisfautomaticallyfresetfbyfpowerfonfresetf (POR)fcircuitry.fXCLRfcanfbefleftffloatingfiffnotfu sed.fThefpadfhasfanfinternalfpull8upfresistorfoff typ.f120kOhm. f f f f

4.1 I2C specification

f ElectricalfparametersfforfthefI 2Cfinterface:f Parameter Symbol Min. Typ Max. Units Clockfinputffrequencyf f SCLf f f 3.4f MHzf Input8lowflevelf V IL f 0f f 0.2f*fV DDDf Vf Input8highflevelf V IH f 0.8f*fV DDDf f V DDDf Vf SDAfandfSCLfpull8upfresistorf R pull8up f 2.2f f 10f kOhmf SDAfsinkfcurrentff @fV DDD f=f1.62V,fV OL f=f0.3Vf ISDA_sink f f 9f f mAf EOCfsinkfcurrentff @fV DDD f=f1.62V,fV OL f=f0.3Vf ISDA_sink f f 7.7f f mAf EOCfsourcefcurrentff @fV DDD f=f1.62V,fVOH f=f1.32Vf ISDA_source f f 1.5f f mAf XCLRfpulseflengthf t XCLR f 1f f f µsf Start8upftimefafterfpower8up,fbeforef firstfcommunicationf t Start f 10f f f msf f

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4.2 Device and register address

Thef BMP085f modulef addressf isf shownf below.f Thef LSBf off thef devicef addressf distinguishesf betweenf readf (1)f andf writef (0)f operation,f correspondingf tof addressf 0xEFf (read)f andf 0xEEf (write).f f A7f A6f A5f A4f A3f A2f A1f W/Rf 1f 1f 1f 0f 1f 1f 1f 0/1f f Theref isf anf easyf wayf tof connectf twof BMP085f tof thef samef I 2Cf bus:f YoufcanfusefthefXCLRf inputfoffBMP085ftofsetfonefBMP085fpartfsilentfwhile fyoufcommunicatefwithfthefotherfBMP085f partf viaf I 2Cf andf vicef versa.f Thef signalsf canf bef providedf byf twof digitalf outputsf offthefmicro8 controller,forfonefdigitalfoutputfandfonefinverter.f f f f

4.3 I2C protocol

ThefI 2Cfinterfacefprotocolfhasfspecialfbusfsignalfconditi ons.fStartf(S),fstopf(P)fandfbinaryfdataf conditionsfarefshownfbelow.fAtfstartfcondition,fSCL fisfhighfandfSDAfhasfaffallingfedge.fThenf thefslavefaddressfisfsent.fAfterfthef7faddressfbits ,fthefdirectionfcontrolfbitfR/Wfselectsfthefreadf orf writef operation.f Whenf af slavef devicef recognizesf thatf itf isf beingf addressed,f itf shouldf acknowledgefbyfpullingfSDAflowfinfthefninthfSCLf(ACK)fcycle.f Atf stopf condition,f SCLf isf alsof high,f butf SDAf hasf afrisingfedge.fDatafmustfbefheldfstablefatf SDAfwhenfSCLfisfhigh.fDatafcanfchangefvaluefatfSDAfonlyfwhenfSCLfisflow.f f f f f f

Rev.f1.2f Pagef17f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f Timingfdiagramfforfstartingfpressurefmeasurementf ACKS S ACKS Modulefaddressf writef0xEE Registerfaddressf 0xF4 Controlfregisterf dataf0xF4 SCL SDA ACKSffffffP

4.4 Start temperature and pressure measurement

Theftimingfdiagramsftofstartfthefmeasurementfoffthe ftemperaturefvaluefUTfandfpressurefvaluef UPf aref shownf below.f Afterf startf conditionf thef masterf sendsf thef devicef addressf write,f thef registerf addressf andf thef controlf registerf data.f The f BMP085f sendsf anf acknowledgementf (ACKS)feveryf8fdatafbitsfwhenfdatafisfreceived.fThe fmasterfsendsfafstopfconditionfafterfthef lastfACKS.f f f f f f f f f f f f f f f f Abbreviations:f Sf f f Startf Pf f f Stopf ACKSf f AcknowledgefbyfSlavef ACKMf f AcknowledgefbyfMasterf NACKMff NotfAcknowledgefbyfMasterf f f Controlfregistersfvaluesfforfdifferentfinternalf oversampling_setting f(osrs):f f f f f f f f f f f f f f f f f f f f f f f Insteadf off waitingfforfthefmaximumfconversionftime, fthefoutputfpinfEOCf(endfoffconversion)f canf bef usedftofcheckfiffthefconversionfisffinishedf (logicf1)forfstillfrunningf(logicf0).fAfterfthef conversionfisffinishedfBMP085fswitchesfautomaticallyfinfstandbyfmode.f Measurementf Controlfregisterfvaluef (registerfaddressf0xF4)f Max.fconversionftimef [ms]f Temperatureff 0x2Ef 4.5f Pressuref (osrsf=f0)f 0x34f 4.5ff Pressuref (osrsf=f1)f 0x74f 7.5ff Pressuref (osrsf=f2)f 0xB4f 13.5ff Pressuref (osrsf=f3)f 0xF4f 25.5ff

Rev.f1.2f Pagef18f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f S ACKS Modulefaddress f writef0xEE ACKS Registerfaddress f e.g.f0xF6 MSBfe.g.f ADCfresultf0x5C ACKS Modulefaddress f readf0xEF Restart ACKM LSBfe.g.f ADCfresultf0x96 NACKM SCL SDA P f

4.5 Read A/D conversion result or E

TofreadfoutftheftemperaturefdatafwordfUTf(16fbit),fthefpressurefdatafwordfUPf(16ftof19fbit)fandf thefE2PROMfdatafproceedfasffollows:ff f Afterf thef startf conditionf thef masterf sendsf thef modulef addressf writef commandf andf registerf address.fThefregisterfaddressfselectsfthefreadfregister:f f E 2PROMfdatafregistersff f f 0xAAftof0xBFf TemperatureforfpressurefvaluefUTforfUPff 0xF6f(MSB), ff0xF7f(LSB),foptionallyf0xF8f(XLSB)f f Thenf thef masterf sendsf af restartf conditionf followedfbyf thef modulef addressf readf thatf willf bef acknowledgedfbyfthefBMP085f(ACKS).fThefBMP085fsends ffirstfthef8fMSB,facknowledgedfbyf thef masterf (ACKM),f thenf thef 8f LSB.f Thef masterf sendsf af "notf acknowledge"f (NACKM)f andf finallyfafstopfcondition.ff f Optionallyfforfultrafhighfresolution,fthefXLSBfregi sterfwithfaddressf0xF8fcanfbefreadftofextendf thef16fbitfwordftofupftof19fbits;freferftofthefappl icationfprogrammingfinterfacef(API)fsoftwaref rev.f1.1f(“ BMP085_SMD500_API”, availableffromfBoschfSensortec).f f f Timingfdiagramfreadf16fbitfA/Dfconversionfresult:f f f f f f f f f f f f f

Rev.f1.2f Pagef19f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f f

5 Package

5.1 Pin configuration

f Picturefshowsfthefdevicefinftopfview.fDevicefpinsfarefshownfhereftransparentlyfonlyfforf orientationfpurposes.f f f f f f f f f f f f f f f f f f f f f f f Pin No. Name Function Type 1f GNDf Groundf Powerf 2f EOCf Endfoffconversionf Digitalfoutputf 3f V DDA f Powerfsupplyf Powerf 4f V DDD f Digitalfpowerfsupplyf Powerf 5f NCf nofinternalfconnectionf 8f 6f SCLf I 2Cfserialfbusfclockfinputf Digitalfinputf 7f SDAf I 2Cfserialfbusfdataf Digitalfbi8directionalf 8f XCLRf masterfclearf(lowfactive)finput Digitalfinputf f

Rev.f1.2f Pagef20f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f

5.2 Outline dimensions

Thef sensorf housingf isf af standardf 88pinf lead8lessf chipf carrierf (LCC8)f ceramicf package.f Itsf Packagefweightfisfapproximatelyf0.09grams.f f Note:fAllfdimensionsfarefinfmm.f f f

5.2.1 Top view

Devicefpinsfarefshownfhereftransparentlyfonlyfforforientationfpurposes. f f f f f f f f f f f f f f f f f f f f f f

5.2.2 Top view with lid

Rev.f1.2f Pagef21f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f f

5.2.3 Side view with lid

f f f f

Rev.f1.2f Pagef22f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f

5.3 Device marking

Thefdeviceflidfshowsftheffollowingflaser8marking:f f f Pinf1fidentifierf f f Datefcodef f Boschflogof/fventfholef/flastf3fdigitsfoffpartfIDf(TTN)f f LotfIDf f f f f Thefventfholef(diameterf0.5mm)fisfinfthefcenterfoff theflid,fbetweenfthefBoschflogofandfthefpartf IDfcodef(144).f f f

5.4 Tape on reel

Numberfoffpartsfperfreel:f3,000f OrientationfoffthefpartsfinsidefthefreelfisfaccordingftofEN6028683.f f f f fffffffffffffffffff f f f Carrierftapefmaterial:fConductivefpolystyrenefCf100,ffff10 3f–f10 6fOhm/sq.f f Dimensionsfarefinfmm:f f A 0ff =f 5.30f±f0.10f B0ff =f 5.30f±f0.10f K0ff =f 2.10f±f0.10f Pff =f 8.00f±f0.10f Wff =f 12.00f+0.30f/f80.10f tff =f 0.30f±f0.05f f Thef barsf betweenf thef cavitiesf aref embossedf aboutf 0.2mmf intof thef directionf off K 0.f Allf otherf dimensionsfandftolerancesffollowfthefEIAf481fstandard.f f 144f

Rev.f1.2f Pagef23f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f

5.5 Printed circuit board (PCB) design

RecommendedfPCBfdesignf(topfview):f f

5.6 Moisture sensitivity level and soldering

f ThefBMP085fisfclassifiedfMSLf1f(moisturefsensitivit yflevel)faccordingftofIPC/JEDECfstandardsf J8STD8020DfandfJ8STD8033A.ff f Thef devicef canf bef solderedf Pb8freef withf af peakf temperaturef off 260°Cfforf20ftof40fsec.fThef minimumf heightf off thef solderf afterf reflowf shallf befatf leastf 50µm.f Thisf isf requiredf forf goodf mechanicalfdecouplingfbetweenfthefsensorfdevicefandfthefprintedfcircuitfboardf(PCB).f f ThefBMP085fdevicesfhaveftofbefsolderedfwithinf6fmon thsfafterfshipmentf(shelfflife).fTofensuref goodfsolder8ability,fthefdevicesfshallfbefstoredfatfroomftemperaturef(20°C).ff f Thefsolderingfprocessfcanfleadftofanfoffsetfshiftfofftypicallyf1hPa. f f f

Rev.f1.2f Pagef24f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f

5.7 RoHS compliancy

Thef BMP085f sensorf meetsf thef requirementsf off thef ECfdirectivef "Restrictionf off hazardousf substancesf(RoHS)",fpleasefreferfalsofto:f f "Directivef2002/95/ECfoffthefEuropeanfParliamentfan dfoffthefCouncilfoff27fJanuaryf2003fonf thef restrictionf off thef usef off certainf hazardousf sub stancesf inf electricalf andf electronicf equipment".f f ThefBMP085fsensorfisfalsofhalogen8free.fPleasefcontactfyourfBoschfSensortecfrepresentativef forfthefcorrespondingfanalysisfreport. f f

Rev.f1.2f Pagef25f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f

5.8 Mounting and assembly recommendations

Pleasefreadftheffollowingfrecommendationsfcarefully:f

• Thefclearancefabovefthefmetalflidfshallfbef0.1mmfatfminimum.f f
• Forf thef devicef housingf appropriatefventingfneedsftofbefprovidedfinfcasefthefambientf pressuref shallf bef measured.f Iff waterprooff packaging f isf needed,f ventingf canf bef accomplishedfbyfafventfelementfwithfafmembraneflikefGore8Tex (TM) .f f
• Liquidsfshallfnotfcomefintofdirectfcontactfwithfthefdevice.f f
• Duringfoperationfthefsensorfisfsensitiveftoflight,f whichfcanfinfluencefthefaccuracyfoffthef measurementf (photo8currentf off silicon).f Therefore,fthef holef inf thef topf lidf shallf notf bef exposedftofdirectflightfduringfoperation.f f
• Thef BMP085f shallf notf thef placedf closef thef fastf heatingf parts.f Inf casef off gradientsf >f3°C/sec.f itf isf recommendedf tof followf Boschf Sensortecf applicationf notef ANP015,f "Correctionfofferrorsfinducedfbyffastftemperaturefc hanges".fPleasefcontactfyourfBoschf Sensortecfrepresentativefforfdetails.f f
• Forf furtherf details,f pleasef referf tof thef BMP085f han dling,f solderingf &f mountingf instructionsfmanualfthatfisfalsofavailableffromfBoschfSensortec.f f f f f f

Rev.f1.2f Pagef26f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f

6 Legal disclaimer

6.1 Engineering samples

EngineeringfSamplesfarefmarkedfwithfanfasteriskf(*) forf(e).fSamplesfmayfvaryffromfthefvalidf technicalfspecificationsfoffthefproductfseriesfcontainedfinfthisfdatafsheet.fTheyfarefthereforefnotf intendedforffitfforfresaleftofthirdfpartiesforfforf usefinfendfproducts.fTheirfsolefpurposefisfinternalf clientf testing.f Thef testingf off anf engineeringf samplef mayf inf nof wayf replacef thef testingf off af productfseries.fBoschfSensortecfassumesfnofliabilit yfforfthefusefoffengineeringfsamples.fThef PurchaserfshallfindemnifyfBoschfSensortecffromfallf claimsfarisingffromfthefusefoffengineeringf samples.f f f

6.2 Product use

BoschfSensortecfproductsfarefdevelopedfforfthefcons umerfgoodsfindustry.fTheyfmayfonlyfbef usedfwithinfthefparametersfoffthisfproductfdatafshe et.fTheyfarefnotffitfforfusefinflife8sustainingf orfsecurityfsensitivefsystems.fSecurityfsensitivefs ystemsfarefthosefforfwhichfafmalfunctionfisf expectedftofleadftofbodilyfharmforfsignificantfprop ertyfdamage.fInfaddition,ftheyfarefnotffitfforf usefinfproductsfwhichfinteractfwithfmotorfvehiclefsystems.f f Thefresalefand/orfusefoffproductsfarefatfthefpurcha ser’sfownfriskfandfhisfownfresponsibility.f ThefexaminationfofffitnessfforfthefintendedfusefisfthefsolefresponsibilityfoffthefPurchaser.ff f Thef purchaserf shallf indemnifyf Boschf Sensortecf fromfallf thirdf partyf claimsf arisingf fromf anyf productfusefnotfcoveredfbyfthefparametersfoffthisfproductfdatafsheetforfnotfapprovedfbyfBoschf SensortecfandfreimbursefBoschfSensortecfforfallfcostsfinfconnectionfwithfsuchfclaims.f f Thefpurchaserfmustfmonitorfthefmarketfforfthefpurch asedfproducts,fparticularlyfwithfregardftof productfsafety,fandfinformfBoschfSensortecfwithoutfdelayfoffallfsecurityfrelevantfincidents.f f f

6.3 Application examples and hints

Withfrespectftofanyfexamplesforfhintsfgivenfherein, fanyftypicalfvaluesfstatedfhereinfand/orfanyf informationfregardingfthefapplicationfoffthefdevice ,fBoschfSensortecfherebyfdisclaimsfanyfandf allf warrantiesf andf liabilitiesf off anyf kind,f includi ngf withoutf limitationf warrantiesf off non8 infringementfoffintellectualfpropertyfrightsforfcopyrightsfoffanyfthirdfparty.fThefinformationfgivenf infthisfdocumentfshallfinfnofeventfbefregardedfasfa fguaranteefoffconditionsforfcharacteristics.f Theyf aref providedf forf illustrativef purposesf onlyf andf nof evaluationf regardingf infringementf off intellectualf propertyf rightsf orf copyrightsf orf regardingf functionality,f performancef orf errorf hasf beenfmade.f

Rev.f1.2f Pagef27f 15fOctoberf2009 ©fBoschfSensortecfGmbHfreservesfallfr ightsfevenfinfthefeventfoffindustrialfpropertyfrights.fWefreservefallfrightsfoffdisposalfsuchf asf copyingfandfpassingfonftofthirdfparties.fBOSCHfandfthefsymbolfarefregisteredftrademarksfoffRobertfBosc hfGmbH,fGermany. f Specificationsfarefsubjectftofchang efwithoutfnotice. f

7 Document history and modifications

Rev. No Chapter Description of modifications/changes Date 0.1f f Firstfeditionfforfdescriptionfoffserialfproductionf materialf f 0.2f f Noisefdatafupdate,fpeakfcurrentfadded,fseveralf minorfchangesf 198Feb82008f 0.3f 1f Updatefpeakfcurrent,ftypofcorrectionf 218Apr82 008f f 1f ChangedfV DDAftofV DD fandfV DDD ftofVDDIO f 218Apr82008f f 3.5f Updatedfflowfdiagramf 218Apr82008f f 4f NewfcommentfonffloatingfXCLRf 218Apr82008f f 4.1f Addedfdetailsfonfstart8upftimef 218Apr82008f f 5.2f Addedfpackagefweightf 218Apr82008f 1.0f 1f Absolutefaccuracyfatf820°Cfaddedf 018July82008 f f 2f Updatedfstorageftemperaturef 018July82008f f 3.2f AddedfoptionalfEOCftofschematicf 018July82008f f 5.7f BMP085fisfhalogen8freef 018July82008f 1.1f 3.3f Addedfcommentfonfnoisefdatafcalculationf 068 April82009f f 3.5f VariableftypefoffB7fisfunsignedflongf f f 4f Addedfcommentfonflowfactivefmasterfclearfandf 120kOhmsfpull8upfresistorf f f 4.2f AddedfsolutionftofconnectftwofdevicesfBMP085ftof thefsamefI2Cfbus.f f f 4.4f Addedfremarkfaboutfautomaticfstandby8modef f f 5.6f JEDECfJ8STD8020Df f f 5.5f UpdatedforfrecommendedfPCB8designfpicturef f f 5.8f Explainedfthatflightfsensitivityfisfonlyfdurin gfoperation f f 1.2f 3.5f Addedfcommentfonfavailabilityfoffthefref.fsourcef codef 158Oct82009f f BoschfSensortecfGmbHf Gerhard8Kindler8Strassef8f 72770fReutlingenf/fGermanyf f contact@bosch8sensortec.comf www.bosch8sensortec.com f f Modificationsfreservedf |fPrintedfinfGermanyf Specificationsfarefsubjectftofchangefwithoutfnoticef Version_1.2_102009f Documentfnumber:fBST8BMP0858DS000805 f