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SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013ProgrammableMaximumPowerPointTrackingControllerforPhotovoltaicSolarPanelsCheckforSamples:SM724421FEATURESDESCRIPTIONTheSM72442isaprogrammableMPPTcontroller2RenewableEnergyGradecapableofcontrollingfourPWMgatedrivesignalsforProgrammableMaximumPowerPointTrackinga4-switchbuck-boostconverter.
TheSM72442alsoPhotovoltaicSolarPanelVoltageandCurrentfeaturesaproprietaryalgorithmcalledPanelModeDiagnosticwhichallowsforthepaneltobeconnecteddirectlytotheoutputofyourpoweroptimizercircuit.
AlongwithSingleInductorFourSwitchBuck-BoosttheSM72295(PhotovoltaicFullBridgeDriver),itConverterControlcreatesasolutionforanMPPTconfiguredDC-DCI2CInterfaceforCommunicationconverterwithefficienciesupto99.
5%.
IntegratedVOUTOvervoltageProtectionintothechipisan8-channel,12bitA/Dconverterusedtosenseinputandoutputvoltagesandcurrents,Over-CurrentProtectionaswellasboardconfiguration.
ExternallyPackage:TSSOP-28programmablevaluesincludemaximumoutputvoltageandcurrentaswellasdifferentsettingsforslewrate,soft-startandPanelMode.
BlockDiagramFigure1.
BlockDiagram1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2010–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comFigure2.
TypicalApplicationCircuitConnectionDiagramTopViewFigure3.
TSSOP-28PackageSeePackageNumberPW0028A2SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013PINDESCRIPTIONSPinNameDescription1RSTActivelowsignal.
Externalresetinputsignaltothedigitalcircuit.
2NC1Reservedfortestonly.
Thispinshouldbegrounded.
3VDDDDigitalsupplyvoltage.
Thispinshouldbeconnectedtoa5Vsupply,andbypassedtoVSSDwitha0.
1Fmonolithicceramiccapacitor.
4VSSDDigitalground.
Thegroundreturnforthedigitalsupplyandsignals.
5NC2NoConnect.
Thispinshouldbepulleduptothe5Vsupplyusing10kresistor.
6I2C0AddressingforI2Ccommunication.
7I2C1AddressingforI2Ccommunication.
8SCLI2Cclock.
9SDAI2Cdata.
10NC3Reservedfortestonly.
Thispinshouldbegrounded.
11PM_OUTWhenPanelModeisactive,thispinwilloutputa400kHzsquarewavesignalwithamplitudeof5V.
Otherwise,itstayslow.
12VDDAAnalogsupplyvoltage.
Thisvoltageisalsousedasthereferencevoltage.
Thispinshouldbeconnectedtoa5Vsupply,andbypassedtoVSSAwitha1Fand0.
1Fmonolithicceramiccapacitor.
13VSSAAnalogground.
Thegroundreturnfortheanalogsupplyandsignals.
14A0A/DInputChannel0.
Connectaresistordividerto5Vsupplytosetthemaximumoutputvoltage.
Pleaserefertotheapplicationsectionformoreinformationonsettingtheresistorvalue.
15AVINInputvoltagesensingpin.
16A2A/DInputChannel2.
Connectaresistordividertoa5VsupplytosettheconditiontoenterandexitPanelMode(PM).
RefertoconfigurablemodesforSM72442intheapplicationsection.
17AVOUTOutputvoltagesensingpin.
18A4A/DInputChannel4.
Connectaresistordividertoa5Vsupplytosetthemaximumoutputcurrent.
Pleaserefertotheapplicationsectionformoreinformationonsettingtheresistorvalue.
19AIINInputcurrentsensingpin.
20A6A/DInputChannel6.
Connectaresistordividertoa5VsupplytosettheoutputvoltageslewrateandvariousPMconfigurations.
RefertoconfigurablemodesforSM72442intheapplicationsection.
21AIOUTOutputcurrentsensingpin.
22I2C2AddressingforI2Ccommunication.
23NC4NoConnect.
Thispinshouldbeconnectedwith60.
4kpull-upresistorto5V.
24LIBLowsideboostPWMoutput.
25HIBHighsideboostPWMoutput.
26HIAHighsidebuckPWMoutput.
27LIALowsidebuckPWMoutput.
28PMPanelModePin.
Activelow.
PullingthispinlowwillforcethechipintoPanelMode.
Thesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
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comAbsoluteMaximumRatings(1)AnalogSupplyVoltageVA(VDDA-VSSA)-0.
3to6.
0VDigitalSupplyVoltageVD(VDDD-VSSD)-0.
3toVA+0.
3Vmax6.
0VVoltageonAnyPintoGND-0.
3toVA+0.
3VInputCurrentatAnyPin(2)±10mAPackageInputCurrent(2)±20mAStorageTemperatureRange-65°Cto+150°CESDRating(3)HumanBodyModel2kV(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothecomponentmayoccur.
OperatingRatingsareconditionsunderwhichoperationofthedeviceisensured.
OperatingRatingsdonotimplyensuredperformancelimits.
Forensuredperformancelimitsandassociatedtestconditions,seetheElectricalCharacteristicstables.
(2)MinandMaxlimitsare100%productiontestedat25°C.
LimitsovertheoperatingtemperaturerangeareensuredthroughcorrelationusingStatisticalQualityControl(SQC)methods.
LimitsareusedtocalculateAverageOutgoingQualityLevel(AOQL).
(3)Thehumanbodymodelisa100pFcapacitordischargedthrougha1.
5kresistorintoeachpin.
RecommendedOperatingConditionsOperatingTemperature-40°Cto105°CVASupplyVoltage+4.
75Vto+5.
25VVDSupplyVoltage+4.
75VtoVADigitalInputVoltage0toVAAnalogInputVoltage0toVAJunctionTemperature-40°Cto125°C4SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013ElectricalCharacteristicsSpecificationsinstandardtypefaceareforTJ=25°C,andthoseinboldfacetypeapplyoverthefulloperatingjunctiontemperaturerange(1)ParameterTestConditionsMinTypMaxUnitsANALOGINPUTCHARACTERISTICSAVin,AIinInputRange-0toVA-VAVout,AIoutIDCLDCLeakageCurrent--±1ATrackMode-33-pFCINAInputCapacitance(2)HoldMode-3-pFDIGITALINPUTCHARACTERISTICSVILInputLowVoltage--0.
8VVIHInputHighVoltage2.
8--VCINDDigitalInputCapacitance(2)-24pFIINInputCurrent-±0.
01±1ADIGITALOUTPUTCHARACTERISTICSVOHOutputHighVoltageISOURCE=200AVA=VD=5VVD-0.
5--VVOLOutputLowVoltageISINK=200Ato1.
0mAVA=VD=5V--0.
4VIOZH,IOZLHi-ImpedanceOutputLeakageCurrentVA=VD=5V±1ACOUTHi-ImpedanceOutputCapacitance(2)24pFPOWERSUPPLYCHARACTERISTICS(CL=10pF)VA,VDAnalogandDigitalSupplyVoltagesVA≥VD4.
7555.
25VIA+IDTotalSupplyCurrentVA=VD=4.
75Vto5.
25V-11.
515mAPCPowerConsumptionVA=VD=4.
75Vto5.
25V57.
578.
75mW(1)MinandMaxlimitsare100%productiontestedat25°C.
LimitsovertheoperatingtemperaturerangeareensuredthroughcorrelationusingStatisticalQualityControl(SQC)methods.
LimitsareusedtocalculateAverageOutgoingQualityLevel(AOQL).
(2)Nottested.
Ensuredbydesign.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comElectricalCharacteristics(continued)SpecificationsinstandardtypefaceareforTJ=25°C,andthoseinboldfacetypeapplyoverthefulloperatingjunctiontemperaturerange(1)ParameterTestConditionsMinTypMaxUnitsPWMOUTPUTCHARACTERISTICSfPWMPWMswitchingfrequency220kHz6SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013OperationDescriptionOVERVIEWTheSM72442isaprogrammableMPPTcontrollercapableofoutputtingfourPWMgatedrivesignalsfora4-switchbuck-boostconverterwithanindependentPanelMode.
ThetypicalapplicationcircuitisshowninFigure2.
TheSM72442usesanadvanceddigitalcontrollertogenerateitsPWMsignals.
Amaximumpowerpointtracking(MPPT)algorithmmonitorstheinputcurrentandvoltageandcontrolsthePWMdutycycletomaximizeenergyharvestedfromthephotovoltaicmodule.
MPPTperformanceisveryfast.
Convergencetothemaximumpowerpointofthemoduletypicallyoccurswithin0.
01s.
Thisenablesthecontrollertomaintainoptimumperformanceunderfast-changingirradianceconditions.
Transitionsbetweenbuck,boost,andPanelModearesmoothedandadvanceddigitalPWMditheringtechniquesareemployedtoincreaseeffectivePWMresolution.
Outputvoltageandcurrentlimitingfunctionalityareintegratedintothedigitalcontrollogic.
Thecontrolleriscapableofhandlingbothshortedandno-loadconditionsandwillrecoversmoothlyfrombothconditions.
Figure4.
HighLevelStateDiagramforStartupCopyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
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comSTARTUPSM72442hasasoftstartfeaturethatwillrampitsoutputvoltageforafixedtimeof250ms.
Ifnooutputcurrentisdetectedduringsoft-starttime,thechipwillthenbeinPanelModefor60seconds.
Acounterwillstartoncetheminimumoutputcurrentthresholdismet(setbyADCinputchannel4).
Duringthese60seconds,anyvariationontheoutputpowerwillnotcausethechiptoenterMPPTmode.
Once60secondshaveelapsed,atacertainpowerlevelvariationattheoutput(setbyADCinputchannel2)willengagethechipinMPPTmode.
IftheoutputcurrentexceededthecurrentthresholdsetatA/DChannel6(A6)duringsoft-start,thechipwillthenengageinMPPTmode.
Figure5.
StartupSequenceMAXIMUMOUTPUTVOLTAGEMaximumoutputvoltageontheSM72442issetbyresistordividerratioonpinA0.
(PleaserefertoFigure2TypicalApplicationCircuit).
whereRT1andRB1aretheresistordividerontheADCpinA0RFB1andRFB2aretheoutputvoltagesenseresistors.
AtypicalvalueforRFB2isabout2k(1)CURRENTLIMITSETTINGMaximumoutputcurrentcanbesetbychangingtheresistordivideronA4(pin18).
RefertoFigure2.
OvercurrentattheoutputisdetectedwhenthevoltageonAIOUT(pin21)equalsthevoltageonA4(pin18).
ThevoltageonA4canbesetbyaresistordividerconnectedto5VwhereasthevoltageonAIOUTcanbesetbyacurrentsenseamplifier.
AVINPINAVINisanA/DinputtosensetheinputvoltageoftheSM72442.
Aresistordividercanbeusedtoscalemaxvoltagetoabout4V,whichis80%ofthefullscaleoftheA/Dinput.
CONFIGURABLESETTINGSA/DpinsA0,A2,A4,andA6areusedtoconfigurethebehavioroftheSM72442byadjustingthevoltageappliedtothem.
OnewaytodothisisthroughresistordividersasshowninFigure2,whereRT1toRT4shouldbeintherangeof20k.
8SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
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comSNVS689H–OCTOBER2010–REVISEDAPRIL2013DifferentconditionstoenterandexitPanelModecanbesetontheADCinputchannel2.
ListedbelowaredifferentconditionsthatausercanselectonpinA2.
"1:1"referstothestateinwhichtheDC/DCconverteroperateswithitsoutputvoltageequaltoitsinputvoltage(alsoreferredtoas"Buck-Boost"modeinFigure4.
)A2EnteringPanelModeExitingPanelMode4.
69V2sin1:1Mode3.
1%powervariation4.
06V1sin1:1Mode3.
1%powervariation3.
44V0.
4sin1:1Mode3.
1%powervariation2.
81V0.
2sin1:1Mode3.
1%powervariation2.
19V2sin1:1Mode1.
6%powervariation1.
56V1sin1:1Mode1.
6%powervariation0.
94V0.
4sin1:1Mode1.
6%powervariation0.
31V0.
2sin1:1Mode1.
6%powervariationTheusercanalsoselecttheoutputvoltageslewrate,minimumcurrentthresholdanddurationofPanelModeafterthesoft-startperiodhasfinished,bychangingthevoltagelevelonpinA6whichistheinputofADCchannel6.
A6OutputVoltageStartingPanelModeMPPTExitMPPTStartStartingboostratioSlewRateLimitTimeThresholdThreshold4.
69VSlowNotapplicable0mA0mA1:14.
06VSlow60s75mA125mA1:13.
44VSlow0s300mA500mA1:12.
81VSlow120s300mA500mA1:12.
19VSlowNotapplicable300mA500mA1:1.
21.
56VSlow60s300mA500mA1:10.
94VFast60s300mA500mA1:10.
31VNoslewratelimit60s300mA500mA1:1PARAMETERDEFINITIONSOutputVoltageSlewRateLimitSettlingTime:Timeconstantoftheinternalfilterusedtolimitoutputvoltagechange.
Forfastslewrate,every1Vincrease,theoutputvoltagewillbeheldfor30mswhereasinaslowslewrate,theoutputvoltagewillbeheldfor62msforevery1Vincrease.
(SeeFigure6).
StartingPMTime:Afterinitialpower-uporreset,theoutputsoft-startsandthenentersPanelModeforthisamountoftime.
MPPTExitThresholdandMPPTStartThreshold:ThesearethehystereticthresholdsforIout_th.
StartingBoostRatio–Thisistheend-pointofthesoft-startvoltageramp.
1:1ratiomeansitstopswhenVout=Vin,1:1.
2meansitstopswhenVout=1.
2xVin.
PANELMODEPIN(PM)PINTheSM72442canbeforcedintoPanelModebypullingthePMpinlow.
Onesampleapplicationistoconnectthispintotheoutputofanexternaltemperaturesensor;thereforewheneveranover-temperatureconditionisdetectedthechipwillenteraPanelMode.
OncePanelModeisenabledeitherwhenbuck-boostmodeisenteredforacertainperiodoftime(adjustableonchannel2ofADC)orwhenPMispulledlow,thePM_OUTpinwilloutputa400kHzsquarewavesignal.
Usingagatedriverandtransformer,thissquarewavesignalcanthenbeusedtodriveaPanelModeFETasshowninFigure7.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
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comFigure6.
SlewRateLimitationCircuitFigure7.
SampleApplicationforPanelModeOperationRESETPINWhentheresetpinispulledlow,thechipwillceaseitsnormaloperationandturn-offallofitsPWMoutputsincludingtheoutputofPM_OUTpin.
Belowisanoscilloscopecaptureofaforcedresetcondition.
Figure8.
ForcedResetConditionAsseeninFigure8,theinitialvalueforoutputvoltageandloadcurrentare28Vand1Arespectively.
Aftertheresetpinisgroundedboththeoutputvoltageandloadcurrentdecreasesimmediately.
MOSFETswitchingonthebuck-boostconverteralsostopsimmediately.
VLOBindicatesthelowsideboostoutputfromtheSM72295.
10SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
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comSNVS689H–OCTOBER2010–REVISEDAPRIL2013ANALOGINPUTAnequivalentcircuitforoneoftheADCinputchannelsisshowninFigure9.
DiodeD1andD2provideESDprotectionfortheanaloginputs.
Theoperatingrangefortheanaloginputsis0VtoVA.
GoingbeyondthisrangewillcausetheESDdiodestoconductandresultinerraticoperation.
ThecapacitorC1inFigure9hasatypicalvalueof3pFandismainlythepackagepincapacitance.
ResistorR1istheonresistanceofthemultiplexerandtrack/holdswitch;itistypically500.
CapacitorC2istheADCsamplingcapacitor;itistypically30pF.
TheADCwilldeliverbestperformancewhendrivenbyalow-impedancesource(lessthan100).
Thisisspeciallyimportantwhensamplingdynamicsignals.
Alsoimportantwhensamplingdynamicsignalsisaband-passorlow-passfilterwhichreducesharmonicandnoiseintheinput.
Thesefiltersareoftenreferredtoasanti-aliasingfilters.
Figure9.
EquivalentInputCircuitDIGITALINPUTSandOUTPUTSThedigitalinputsignalshaveanoperatingrangeof0VtoVA,whereVA=VDDA–VSSA.
Theyarenotpronetolatch-upandmaybeassertedbeforethedigitalsupplyVD,whereVD=VDDD–VSSD,withoutanyrisk.
ThedigitaloutputsignalsoperatingrangeiscontrolledbyVD.
TheoutputhighvoltageisVD–0.
5V(min)whiletheoutputlowvoltageis0.
4V(max).
SDAandSCLOPENDRAINOUTPUTSCLandSDAoutputisanopen-drainoutputanddoesnothaveinternalpull-ups.
A"high"levelwillnotbeobservedonthispinuntilpull-upcurrentisprovidedbysomeexternalsource,typicallyapull-upresistor.
Choiceofresistorvaluedependsonmanysystemfactors;loadcapacitance,tracelength,etc.
Atypicalvalueofpull-upresistorforSM72442rangesfrom2kto10k.
Formoreinformation,refertotheI2CBusspecificationforselectingthepull-upresistorvalue.
TheSCLandSDAoutputscanoperatewhilebeingpulledupto5Vand3.
3V.
I2CCONFIGURATIONREGISTERSTheoperationoftheSM72442canbeconfiguredthroughitsI2Cinterface.
CompleteregistersettingsforI2Clinesareshownbelow.
Table1.
reg0RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:40RSVD16'h0RReservedforfutureuse.
39:30ADC610'h0RAnalogChannel6(slewratedetectiontimeconstant,seeadcconfigworksheet)29:20ADC410'h0RAnalogChannel4(iout_max:maximumallowedoutputcurrent)19:10ADC210'h0RAnalogChannel2(operatingmode,seeadc_configworksheet)9:0ADC010'h0RAnalogChannel0(vout_max:maximumallowedoutputvoltage)Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
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comTable2.
reg1RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:41RSVD15'h0RReservedforfutureuse.
40mppt_ok1'h0RInternalmppt_startsignal(testonly)39:30Vout10'h0RVoltageout29:20Iout10'h0RCurrentout19:10Vin10'h0RVoltagein9:0Iin10'h0RCurrentinTable3.
reg3RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:47RSVD9'd0R/WReserved46overide_adcprog1'b0R/WWhensetto1'b1,thebelowoverideregistersusedinsteadofADC45RSVD1'b0R/WReserved44:43RSVD2'b01R/WReserved42power_thr_sel1'b0R/WRegisteroverridealternativeforADC2[9]whenreg3[46]isset(1/2^^5or1/2^^6)41:40bb_in_ptmode_se2'd0R/WRegisteroverridealternativeforADC2[8:7]whenlreg3[46]isset(5%,10%,25%or50%)39:30iout_max10'd1023R/WRegisteroverridealternativewhenreg3[46]issetformaximumcurrentthresholdinsteadofADCch429:20vout_max10'd1023R/WRegisteroverridealternativewhenreg3[46]issetformaximumvoltagethresholdinsteadofADCch019:17tdoff3'h3R/WDeadtimeOffTime16:14tdon3'h3R/WDeadtimeOntime13:5dc_open9'hFFR/WOpenloopdutycycle(testonly)4pass_through_sel1'b0R/WOverridesPMpin28andusereg3[3]3pass_through_ma1'b0R/WControlPanelModewhenpass_through_selbitis1'b1nual2bb_reset1'b0R/WSoftreset1clk_oe_manual1'b0R/WEnablethePLLclocktoappearonpin50OpenLoop1'b0R/WOpenLoopoperation(MPPTdisabled,receivesdutyoperationcyclecommandfromreg3b13:5);setto1andthenassert&deassertbb_resettoputthedeviceinopenloop(testonly)Table4.
reg4RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:32RSVD24'd0R/WReserved31:24Voutoffset8'h0R/WVoltageoutoffset23:16Ioutoffset8'h0R/WCurrentoutoffset15:8Vinoffset8'h0R/WVoltageinoffset7:0Iinoffset8'h0R/WCurrentinoffsetTable5.
reg5RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:40RSVD15'd0R/WReserved39:30iin_hi_th10'd40R/WCurrentinhighthresholdforstart29:20iin_lo_th10'd24R/WCurrentinlowthresholdforstart19:10iout_hi_th10'd40R/WCurrentouthighthresholdforstart9:0iout_lo_th10'd24R/WCurrentoutlowthresholdforstart12SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013UsingtheI2Cport,theuserwillbeabletocontrolthedutycycleofthePWMsignal.
InputandoutputvoltageandcurrentoffsetcanalsobecontrolledusingI2Conregister4.
Controlregistersareavailableforadditionalflexibility.
Thethresholdsiin_hi_th,iin_lo_th,iout_hi_th,iout_lo_th,inreg5arecomparedtothevaluesreadinbytheADContheAIINandAIOUTpins.
ScalingissetbythescalingoftheanalogsignalfedintoAIINandAIOUT.
These10–bitvaluesdeterminetheentryandexitconditionsforMPPT.
COMMUNICATINGWITHTHESM72442TheSCLlineisaninput,theSDAlineisbidirectional,andthedeviceaddresscanbesetbyI2C0,I2C1andI2C2pins.
Threedeviceaddresspinsallowconnectionofupto7SM72444stothesameI2Cmaster.
Apull-upresistor(10k)toa5Vsupplyisusedtosetabit1onthedeviceaddress.
Deviceaddressingforslavesareasfollows:I2C0I2C1I2C2Hex0010x10100x20110x31000x41010x51100x61110x7ThedataregistersintheSM72442areselectedbytheCommandRegister.
TheCommandRegisterisoffsetfrombaseaddress0xE0.
EachdataregisterintheSM72442fallsintooneoftwotypesofuseraccessibility:1)Readonly(Reg0,Reg1)2)Write/Readsameaddress(Reg3,Reg4,Reg5)Thereare7bytesineachregister(56bits),anddatamustbereadandwritteninblocksof7bytes.
Figure10depictstheorderingofthebytestransmittedineachframeandthebitswithineachbyte.
InthereadsequencedepictedinFigure11thedatabytesaretransmittedinFrames5through11,startingfromtheLSByte,DATA1,andendingwithMSByte,DATA7.
InthewritesequencedepictedinFigure12,thedatabytesaretransmittedinFrames4through11.
Onlythe100kHzdatarateissupported.
Pleasereferto"TheI2CBusSpecification"version2.
1(Doc#:939839340011)formoredocumentationontheI2Cbus.
Figure10.
EndiannessDiagramCopyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
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comFigure11.
I2CReadSequenceFigure12.
I2CWriteSequence14SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
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comSNVS689H–OCTOBER2010–REVISEDAPRIL2013Noisecouplingintodigitallinesgreaterthan400mVp-p(typicalhysteresis)andundershootlessthan500mVGND,maypreventsuccessfulI2CcommunicationwithSM72442.
I2Cnoacknowledgeisthemostcommonsymptom,causingunnecessarytrafficonthebusalthoughtheI2Cmaximumfrequencyofcommunicationisratherlow(400kHzmax),carestillneedstobetakentoensureproperterminationwithinasystemwithmultiplepartsonthebusandlongprintedboardtraces.
AdditionalresistancecanbeaddedinserieswiththeSDAandSCLlinestofurtherhelpfilternoiseandringing.
MinimizenoisecouplingbykeepingdigitalracesoutofswitchingpowersupplyareasaswellasensuringthatdigitallinescontaininghighspeeddatacommunicationscrossatrightanglestotheSDAandSCLlines.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback15ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
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comREVISIONHISTORYChangesfromRevisionG(April2013)toRevisionHPageChangedlayoutofNationalDataSheettoTIformat1516SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesSM72442MT/NOPBACTIVETSSOPPW2848RoHS&GreenSNLevel-3-260C-168HR-40to125SO2442SM72442MTE/NOPBACTIVETSSOPPW28250RoHS&GreenSNLevel-3-260C-168HR-40to125SO2442SM72442MTX/NOPBACTIVETSSOPPW282500RoHS&GreenSNLevel-3-260C-168HR-40to125SO2442(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
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TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantSM72442MTE/NOPBTSSOPPW28250178.
016.
46.
810.
21.
68.
016.
0Q1SM72442MTX/NOPBTSSOPPW282500330.
016.
46.
810.
21.
68.
016.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com20-Sep-2016PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)SM72442MTE/NOPBTSSOPPW28250210.
0185.
035.
0SM72442MTX/NOPBTSSOPPW282500367.
0367.
038.
0PACKAGEMATERIALSINFORMATIONwww.
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com20-Sep-2016PackMaterials-Page2IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
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MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013ProgrammableMaximumPowerPointTrackingControllerforPhotovoltaicSolarPanelsCheckforSamples:SM724421FEATURESDESCRIPTIONTheSM72442isaprogrammableMPPTcontroller2RenewableEnergyGradecapableofcontrollingfourPWMgatedrivesignalsforProgrammableMaximumPowerPointTrackinga4-switchbuck-boostconverter.
TheSM72442alsoPhotovoltaicSolarPanelVoltageandCurrentfeaturesaproprietaryalgorithmcalledPanelModeDiagnosticwhichallowsforthepaneltobeconnecteddirectlytotheoutputofyourpoweroptimizercircuit.
AlongwithSingleInductorFourSwitchBuck-BoosttheSM72295(PhotovoltaicFullBridgeDriver),itConverterControlcreatesasolutionforanMPPTconfiguredDC-DCI2CInterfaceforCommunicationconverterwithefficienciesupto99.
5%.
IntegratedVOUTOvervoltageProtectionintothechipisan8-channel,12bitA/Dconverterusedtosenseinputandoutputvoltagesandcurrents,Over-CurrentProtectionaswellasboardconfiguration.
ExternallyPackage:TSSOP-28programmablevaluesincludemaximumoutputvoltageandcurrentaswellasdifferentsettingsforslewrate,soft-startandPanelMode.
BlockDiagramFigure1.
BlockDiagram1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2010–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comFigure2.
TypicalApplicationCircuitConnectionDiagramTopViewFigure3.
TSSOP-28PackageSeePackageNumberPW0028A2SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013PINDESCRIPTIONSPinNameDescription1RSTActivelowsignal.
Externalresetinputsignaltothedigitalcircuit.
2NC1Reservedfortestonly.
Thispinshouldbegrounded.
3VDDDDigitalsupplyvoltage.
Thispinshouldbeconnectedtoa5Vsupply,andbypassedtoVSSDwitha0.
1Fmonolithicceramiccapacitor.
4VSSDDigitalground.
Thegroundreturnforthedigitalsupplyandsignals.
5NC2NoConnect.
Thispinshouldbepulleduptothe5Vsupplyusing10kresistor.
6I2C0AddressingforI2Ccommunication.
7I2C1AddressingforI2Ccommunication.
8SCLI2Cclock.
9SDAI2Cdata.
10NC3Reservedfortestonly.
Thispinshouldbegrounded.
11PM_OUTWhenPanelModeisactive,thispinwilloutputa400kHzsquarewavesignalwithamplitudeof5V.
Otherwise,itstayslow.
12VDDAAnalogsupplyvoltage.
Thisvoltageisalsousedasthereferencevoltage.
Thispinshouldbeconnectedtoa5Vsupply,andbypassedtoVSSAwitha1Fand0.
1Fmonolithicceramiccapacitor.
13VSSAAnalogground.
Thegroundreturnfortheanalogsupplyandsignals.
14A0A/DInputChannel0.
Connectaresistordividerto5Vsupplytosetthemaximumoutputvoltage.
Pleaserefertotheapplicationsectionformoreinformationonsettingtheresistorvalue.
15AVINInputvoltagesensingpin.
16A2A/DInputChannel2.
Connectaresistordividertoa5VsupplytosettheconditiontoenterandexitPanelMode(PM).
RefertoconfigurablemodesforSM72442intheapplicationsection.
17AVOUTOutputvoltagesensingpin.
18A4A/DInputChannel4.
Connectaresistordividertoa5Vsupplytosetthemaximumoutputcurrent.
Pleaserefertotheapplicationsectionformoreinformationonsettingtheresistorvalue.
19AIINInputcurrentsensingpin.
20A6A/DInputChannel6.
Connectaresistordividertoa5VsupplytosettheoutputvoltageslewrateandvariousPMconfigurations.
RefertoconfigurablemodesforSM72442intheapplicationsection.
21AIOUTOutputcurrentsensingpin.
22I2C2AddressingforI2Ccommunication.
23NC4NoConnect.
Thispinshouldbeconnectedwith60.
4kpull-upresistorto5V.
24LIBLowsideboostPWMoutput.
25HIBHighsideboostPWMoutput.
26HIAHighsidebuckPWMoutput.
27LIALowsidebuckPWMoutput.
28PMPanelModePin.
Activelow.
PullingthispinlowwillforcethechipintoPanelMode.
Thesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comAbsoluteMaximumRatings(1)AnalogSupplyVoltageVA(VDDA-VSSA)-0.
3to6.
0VDigitalSupplyVoltageVD(VDDD-VSSD)-0.
3toVA+0.
3Vmax6.
0VVoltageonAnyPintoGND-0.
3toVA+0.
3VInputCurrentatAnyPin(2)±10mAPackageInputCurrent(2)±20mAStorageTemperatureRange-65°Cto+150°CESDRating(3)HumanBodyModel2kV(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothecomponentmayoccur.
OperatingRatingsareconditionsunderwhichoperationofthedeviceisensured.
OperatingRatingsdonotimplyensuredperformancelimits.
Forensuredperformancelimitsandassociatedtestconditions,seetheElectricalCharacteristicstables.
(2)MinandMaxlimitsare100%productiontestedat25°C.
LimitsovertheoperatingtemperaturerangeareensuredthroughcorrelationusingStatisticalQualityControl(SQC)methods.
LimitsareusedtocalculateAverageOutgoingQualityLevel(AOQL).
(3)Thehumanbodymodelisa100pFcapacitordischargedthrougha1.
5kresistorintoeachpin.
RecommendedOperatingConditionsOperatingTemperature-40°Cto105°CVASupplyVoltage+4.
75Vto+5.
25VVDSupplyVoltage+4.
75VtoVADigitalInputVoltage0toVAAnalogInputVoltage0toVAJunctionTemperature-40°Cto125°C4SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013ElectricalCharacteristicsSpecificationsinstandardtypefaceareforTJ=25°C,andthoseinboldfacetypeapplyoverthefulloperatingjunctiontemperaturerange(1)ParameterTestConditionsMinTypMaxUnitsANALOGINPUTCHARACTERISTICSAVin,AIinInputRange-0toVA-VAVout,AIoutIDCLDCLeakageCurrent--±1ATrackMode-33-pFCINAInputCapacitance(2)HoldMode-3-pFDIGITALINPUTCHARACTERISTICSVILInputLowVoltage--0.
8VVIHInputHighVoltage2.
8--VCINDDigitalInputCapacitance(2)-24pFIINInputCurrent-±0.
01±1ADIGITALOUTPUTCHARACTERISTICSVOHOutputHighVoltageISOURCE=200AVA=VD=5VVD-0.
5--VVOLOutputLowVoltageISINK=200Ato1.
0mAVA=VD=5V--0.
4VIOZH,IOZLHi-ImpedanceOutputLeakageCurrentVA=VD=5V±1ACOUTHi-ImpedanceOutputCapacitance(2)24pFPOWERSUPPLYCHARACTERISTICS(CL=10pF)VA,VDAnalogandDigitalSupplyVoltagesVA≥VD4.
7555.
25VIA+IDTotalSupplyCurrentVA=VD=4.
75Vto5.
25V-11.
515mAPCPowerConsumptionVA=VD=4.
75Vto5.
25V57.
578.
75mW(1)MinandMaxlimitsare100%productiontestedat25°C.
LimitsovertheoperatingtemperaturerangeareensuredthroughcorrelationusingStatisticalQualityControl(SQC)methods.
LimitsareusedtocalculateAverageOutgoingQualityLevel(AOQL).
(2)Nottested.
Ensuredbydesign.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comElectricalCharacteristics(continued)SpecificationsinstandardtypefaceareforTJ=25°C,andthoseinboldfacetypeapplyoverthefulloperatingjunctiontemperaturerange(1)ParameterTestConditionsMinTypMaxUnitsPWMOUTPUTCHARACTERISTICSfPWMPWMswitchingfrequency220kHz6SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013OperationDescriptionOVERVIEWTheSM72442isaprogrammableMPPTcontrollercapableofoutputtingfourPWMgatedrivesignalsfora4-switchbuck-boostconverterwithanindependentPanelMode.
ThetypicalapplicationcircuitisshowninFigure2.
TheSM72442usesanadvanceddigitalcontrollertogenerateitsPWMsignals.
Amaximumpowerpointtracking(MPPT)algorithmmonitorstheinputcurrentandvoltageandcontrolsthePWMdutycycletomaximizeenergyharvestedfromthephotovoltaicmodule.
MPPTperformanceisveryfast.
Convergencetothemaximumpowerpointofthemoduletypicallyoccurswithin0.
01s.
Thisenablesthecontrollertomaintainoptimumperformanceunderfast-changingirradianceconditions.
Transitionsbetweenbuck,boost,andPanelModearesmoothedandadvanceddigitalPWMditheringtechniquesareemployedtoincreaseeffectivePWMresolution.
Outputvoltageandcurrentlimitingfunctionalityareintegratedintothedigitalcontrollogic.
Thecontrolleriscapableofhandlingbothshortedandno-loadconditionsandwillrecoversmoothlyfrombothconditions.
Figure4.
HighLevelStateDiagramforStartupCopyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comSTARTUPSM72442hasasoftstartfeaturethatwillrampitsoutputvoltageforafixedtimeof250ms.
Ifnooutputcurrentisdetectedduringsoft-starttime,thechipwillthenbeinPanelModefor60seconds.
Acounterwillstartoncetheminimumoutputcurrentthresholdismet(setbyADCinputchannel4).
Duringthese60seconds,anyvariationontheoutputpowerwillnotcausethechiptoenterMPPTmode.
Once60secondshaveelapsed,atacertainpowerlevelvariationattheoutput(setbyADCinputchannel2)willengagethechipinMPPTmode.
IftheoutputcurrentexceededthecurrentthresholdsetatA/DChannel6(A6)duringsoft-start,thechipwillthenengageinMPPTmode.
Figure5.
StartupSequenceMAXIMUMOUTPUTVOLTAGEMaximumoutputvoltageontheSM72442issetbyresistordividerratioonpinA0.
(PleaserefertoFigure2TypicalApplicationCircuit).
whereRT1andRB1aretheresistordividerontheADCpinA0RFB1andRFB2aretheoutputvoltagesenseresistors.
AtypicalvalueforRFB2isabout2k(1)CURRENTLIMITSETTINGMaximumoutputcurrentcanbesetbychangingtheresistordivideronA4(pin18).
RefertoFigure2.
OvercurrentattheoutputisdetectedwhenthevoltageonAIOUT(pin21)equalsthevoltageonA4(pin18).
ThevoltageonA4canbesetbyaresistordividerconnectedto5VwhereasthevoltageonAIOUTcanbesetbyacurrentsenseamplifier.
AVINPINAVINisanA/DinputtosensetheinputvoltageoftheSM72442.
Aresistordividercanbeusedtoscalemaxvoltagetoabout4V,whichis80%ofthefullscaleoftheA/Dinput.
CONFIGURABLESETTINGSA/DpinsA0,A2,A4,andA6areusedtoconfigurethebehavioroftheSM72442byadjustingthevoltageappliedtothem.
OnewaytodothisisthroughresistordividersasshowninFigure2,whereRT1toRT4shouldbeintherangeof20k.
8SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013DifferentconditionstoenterandexitPanelModecanbesetontheADCinputchannel2.
ListedbelowaredifferentconditionsthatausercanselectonpinA2.
"1:1"referstothestateinwhichtheDC/DCconverteroperateswithitsoutputvoltageequaltoitsinputvoltage(alsoreferredtoas"Buck-Boost"modeinFigure4.
)A2EnteringPanelModeExitingPanelMode4.
69V2sin1:1Mode3.
1%powervariation4.
06V1sin1:1Mode3.
1%powervariation3.
44V0.
4sin1:1Mode3.
1%powervariation2.
81V0.
2sin1:1Mode3.
1%powervariation2.
19V2sin1:1Mode1.
6%powervariation1.
56V1sin1:1Mode1.
6%powervariation0.
94V0.
4sin1:1Mode1.
6%powervariation0.
31V0.
2sin1:1Mode1.
6%powervariationTheusercanalsoselecttheoutputvoltageslewrate,minimumcurrentthresholdanddurationofPanelModeafterthesoft-startperiodhasfinished,bychangingthevoltagelevelonpinA6whichistheinputofADCchannel6.
A6OutputVoltageStartingPanelModeMPPTExitMPPTStartStartingboostratioSlewRateLimitTimeThresholdThreshold4.
69VSlowNotapplicable0mA0mA1:14.
06VSlow60s75mA125mA1:13.
44VSlow0s300mA500mA1:12.
81VSlow120s300mA500mA1:12.
19VSlowNotapplicable300mA500mA1:1.
21.
56VSlow60s300mA500mA1:10.
94VFast60s300mA500mA1:10.
31VNoslewratelimit60s300mA500mA1:1PARAMETERDEFINITIONSOutputVoltageSlewRateLimitSettlingTime:Timeconstantoftheinternalfilterusedtolimitoutputvoltagechange.
Forfastslewrate,every1Vincrease,theoutputvoltagewillbeheldfor30mswhereasinaslowslewrate,theoutputvoltagewillbeheldfor62msforevery1Vincrease.
(SeeFigure6).
StartingPMTime:Afterinitialpower-uporreset,theoutputsoft-startsandthenentersPanelModeforthisamountoftime.
MPPTExitThresholdandMPPTStartThreshold:ThesearethehystereticthresholdsforIout_th.
StartingBoostRatio–Thisistheend-pointofthesoft-startvoltageramp.
1:1ratiomeansitstopswhenVout=Vin,1:1.
2meansitstopswhenVout=1.
2xVin.
PANELMODEPIN(PM)PINTheSM72442canbeforcedintoPanelModebypullingthePMpinlow.
Onesampleapplicationistoconnectthispintotheoutputofanexternaltemperaturesensor;thereforewheneveranover-temperatureconditionisdetectedthechipwillenteraPanelMode.
OncePanelModeisenabledeitherwhenbuck-boostmodeisenteredforacertainperiodoftime(adjustableonchannel2ofADC)orwhenPMispulledlow,thePM_OUTpinwilloutputa400kHzsquarewavesignal.
Usingagatedriverandtransformer,thissquarewavesignalcanthenbeusedtodriveaPanelModeFETasshowninFigure7.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comFigure6.
SlewRateLimitationCircuitFigure7.
SampleApplicationforPanelModeOperationRESETPINWhentheresetpinispulledlow,thechipwillceaseitsnormaloperationandturn-offallofitsPWMoutputsincludingtheoutputofPM_OUTpin.
Belowisanoscilloscopecaptureofaforcedresetcondition.
Figure8.
ForcedResetConditionAsseeninFigure8,theinitialvalueforoutputvoltageandloadcurrentare28Vand1Arespectively.
Aftertheresetpinisgroundedboththeoutputvoltageandloadcurrentdecreasesimmediately.
MOSFETswitchingonthebuck-boostconverteralsostopsimmediately.
VLOBindicatesthelowsideboostoutputfromtheSM72295.
10SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013ANALOGINPUTAnequivalentcircuitforoneoftheADCinputchannelsisshowninFigure9.
DiodeD1andD2provideESDprotectionfortheanaloginputs.
Theoperatingrangefortheanaloginputsis0VtoVA.
GoingbeyondthisrangewillcausetheESDdiodestoconductandresultinerraticoperation.
ThecapacitorC1inFigure9hasatypicalvalueof3pFandismainlythepackagepincapacitance.
ResistorR1istheonresistanceofthemultiplexerandtrack/holdswitch;itistypically500.
CapacitorC2istheADCsamplingcapacitor;itistypically30pF.
TheADCwilldeliverbestperformancewhendrivenbyalow-impedancesource(lessthan100).
Thisisspeciallyimportantwhensamplingdynamicsignals.
Alsoimportantwhensamplingdynamicsignalsisaband-passorlow-passfilterwhichreducesharmonicandnoiseintheinput.
Thesefiltersareoftenreferredtoasanti-aliasingfilters.
Figure9.
EquivalentInputCircuitDIGITALINPUTSandOUTPUTSThedigitalinputsignalshaveanoperatingrangeof0VtoVA,whereVA=VDDA–VSSA.
Theyarenotpronetolatch-upandmaybeassertedbeforethedigitalsupplyVD,whereVD=VDDD–VSSD,withoutanyrisk.
ThedigitaloutputsignalsoperatingrangeiscontrolledbyVD.
TheoutputhighvoltageisVD–0.
5V(min)whiletheoutputlowvoltageis0.
4V(max).
SDAandSCLOPENDRAINOUTPUTSCLandSDAoutputisanopen-drainoutputanddoesnothaveinternalpull-ups.
A"high"levelwillnotbeobservedonthispinuntilpull-upcurrentisprovidedbysomeexternalsource,typicallyapull-upresistor.
Choiceofresistorvaluedependsonmanysystemfactors;loadcapacitance,tracelength,etc.
Atypicalvalueofpull-upresistorforSM72442rangesfrom2kto10k.
Formoreinformation,refertotheI2CBusspecificationforselectingthepull-upresistorvalue.
TheSCLandSDAoutputscanoperatewhilebeingpulledupto5Vand3.
3V.
I2CCONFIGURATIONREGISTERSTheoperationoftheSM72442canbeconfiguredthroughitsI2Cinterface.
CompleteregistersettingsforI2Clinesareshownbelow.
Table1.
reg0RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:40RSVD16'h0RReservedforfutureuse.
39:30ADC610'h0RAnalogChannel6(slewratedetectiontimeconstant,seeadcconfigworksheet)29:20ADC410'h0RAnalogChannel4(iout_max:maximumallowedoutputcurrent)19:10ADC210'h0RAnalogChannel2(operatingmode,seeadc_configworksheet)9:0ADC010'h0RAnalogChannel0(vout_max:maximumallowedoutputvoltage)Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comTable2.
reg1RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:41RSVD15'h0RReservedforfutureuse.
40mppt_ok1'h0RInternalmppt_startsignal(testonly)39:30Vout10'h0RVoltageout29:20Iout10'h0RCurrentout19:10Vin10'h0RVoltagein9:0Iin10'h0RCurrentinTable3.
reg3RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:47RSVD9'd0R/WReserved46overide_adcprog1'b0R/WWhensetto1'b1,thebelowoverideregistersusedinsteadofADC45RSVD1'b0R/WReserved44:43RSVD2'b01R/WReserved42power_thr_sel1'b0R/WRegisteroverridealternativeforADC2[9]whenreg3[46]isset(1/2^^5or1/2^^6)41:40bb_in_ptmode_se2'd0R/WRegisteroverridealternativeforADC2[8:7]whenlreg3[46]isset(5%,10%,25%or50%)39:30iout_max10'd1023R/WRegisteroverridealternativewhenreg3[46]issetformaximumcurrentthresholdinsteadofADCch429:20vout_max10'd1023R/WRegisteroverridealternativewhenreg3[46]issetformaximumvoltagethresholdinsteadofADCch019:17tdoff3'h3R/WDeadtimeOffTime16:14tdon3'h3R/WDeadtimeOntime13:5dc_open9'hFFR/WOpenloopdutycycle(testonly)4pass_through_sel1'b0R/WOverridesPMpin28andusereg3[3]3pass_through_ma1'b0R/WControlPanelModewhenpass_through_selbitis1'b1nual2bb_reset1'b0R/WSoftreset1clk_oe_manual1'b0R/WEnablethePLLclocktoappearonpin50OpenLoop1'b0R/WOpenLoopoperation(MPPTdisabled,receivesdutyoperationcyclecommandfromreg3b13:5);setto1andthenassert&deassertbb_resettoputthedeviceinopenloop(testonly)Table4.
reg4RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:32RSVD24'd0R/WReserved31:24Voutoffset8'h0R/WVoltageoutoffset23:16Ioutoffset8'h0R/WCurrentoutoffset15:8Vinoffset8'h0R/WVoltageinoffset7:0Iinoffset8'h0R/WCurrentinoffsetTable5.
reg5RegisterDescriptionBitsFieldResetValueR/WBitFieldDescription55:40RSVD15'd0R/WReserved39:30iin_hi_th10'd40R/WCurrentinhighthresholdforstart29:20iin_lo_th10'd24R/WCurrentinlowthresholdforstart19:10iout_hi_th10'd40R/WCurrentouthighthresholdforstart9:0iout_lo_th10'd24R/WCurrentoutlowthresholdforstart12SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013UsingtheI2Cport,theuserwillbeabletocontrolthedutycycleofthePWMsignal.
InputandoutputvoltageandcurrentoffsetcanalsobecontrolledusingI2Conregister4.
Controlregistersareavailableforadditionalflexibility.
Thethresholdsiin_hi_th,iin_lo_th,iout_hi_th,iout_lo_th,inreg5arecomparedtothevaluesreadinbytheADContheAIINandAIOUTpins.
ScalingissetbythescalingoftheanalogsignalfedintoAIINandAIOUT.
These10–bitvaluesdeterminetheentryandexitconditionsforMPPT.
COMMUNICATINGWITHTHESM72442TheSCLlineisaninput,theSDAlineisbidirectional,andthedeviceaddresscanbesetbyI2C0,I2C1andI2C2pins.
Threedeviceaddresspinsallowconnectionofupto7SM72444stothesameI2Cmaster.
Apull-upresistor(10k)toa5Vsupplyisusedtosetabit1onthedeviceaddress.
Deviceaddressingforslavesareasfollows:I2C0I2C1I2C2Hex0010x10100x20110x31000x41010x51100x61110x7ThedataregistersintheSM72442areselectedbytheCommandRegister.
TheCommandRegisterisoffsetfrombaseaddress0xE0.
EachdataregisterintheSM72442fallsintooneoftwotypesofuseraccessibility:1)Readonly(Reg0,Reg1)2)Write/Readsameaddress(Reg3,Reg4,Reg5)Thereare7bytesineachregister(56bits),anddatamustbereadandwritteninblocksof7bytes.
Figure10depictstheorderingofthebytestransmittedineachframeandthebitswithineachbyte.
InthereadsequencedepictedinFigure11thedatabytesaretransmittedinFrames5through11,startingfromtheLSByte,DATA1,andendingwithMSByte,DATA7.
InthewritesequencedepictedinFigure12,thedatabytesaretransmittedinFrames4through11.
Onlythe100kHzdatarateissupported.
Pleasereferto"TheI2CBusSpecification"version2.
1(Doc#:939839340011)formoredocumentationontheI2Cbus.
Figure10.
EndiannessDiagramCopyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comFigure11.
I2CReadSequenceFigure12.
I2CWriteSequence14SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442SM72442www.
ti.
comSNVS689H–OCTOBER2010–REVISEDAPRIL2013Noisecouplingintodigitallinesgreaterthan400mVp-p(typicalhysteresis)andundershootlessthan500mVGND,maypreventsuccessfulI2CcommunicationwithSM72442.
I2Cnoacknowledgeisthemostcommonsymptom,causingunnecessarytrafficonthebusalthoughtheI2Cmaximumfrequencyofcommunicationisratherlow(400kHzmax),carestillneedstobetakentoensureproperterminationwithinasystemwithmultiplepartsonthebusandlongprintedboardtraces.
AdditionalresistancecanbeaddedinserieswiththeSDAandSCLlinestofurtherhelpfilternoiseandringing.
MinimizenoisecouplingbykeepingdigitalracesoutofswitchingpowersupplyareasaswellasensuringthatdigitallinescontaininghighspeeddatacommunicationscrossatrightanglestotheSDAandSCLlines.
Copyright2010–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback15ProductFolderLinks:SM72442SM72442SNVS689H–OCTOBER2010–REVISEDAPRIL2013www.
ti.
comREVISIONHISTORYChangesfromRevisionG(April2013)toRevisionHPageChangedlayoutofNationalDataSheettoTIformat1516SubmitDocumentationFeedbackCopyright2010–2013,TexasInstrumentsIncorporatedProductFolderLinks:SM72442PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesSM72442MT/NOPBACTIVETSSOPPW2848RoHS&GreenSNLevel-3-260C-168HR-40to125SO2442SM72442MTE/NOPBACTIVETSSOPPW28250RoHS&GreenSNLevel-3-260C-168HR-40to125SO2442SM72442MTX/NOPBACTIVETSSOPPW282500RoHS&GreenSNLevel-3-260C-168HR-40to125SO2442(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page2InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantSM72442MTE/NOPBTSSOPPW28250178.
016.
46.
810.
21.
68.
016.
0Q1SM72442MTX/NOPBTSSOPPW282500330.
016.
46.
810.
21.
68.
016.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com20-Sep-2016PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)SM72442MTE/NOPBTSSOPPW28250210.
0185.
035.
0SM72442MTX/NOPBTSSOPPW282500367.
0367.
038.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com20-Sep-2016PackMaterials-Page2IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
Theseresourcesaresubjecttochangewithoutnotice.
TIgrantsyoupermissiontousetheseresourcesonlyfordevelopmentofanapplicationthatusestheTIproductsdescribedintheresource.
Otherreproductionanddisplayoftheseresourcesisprohibited.
NolicenseisgrantedtoanyotherTIintellectualpropertyrightortoanythirdpartyintellectualpropertyright.
TIdisclaimsresponsibilityfor,andyouwillfullyindemnifyTIanditsrepresentativesagainst,anyclaims,damages,costs,losses,andliabilitiesarisingoutofyouruseoftheseresources.
TI'sproductsareprovidedsubjecttoTI'sTermsofSale(www.
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com/legal/termsofsale.
html)orotherapplicabletermsavailableeitheronti.
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MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
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