Bidirectional Current/Power Monitor with I²C™ Interface ...

1 Power RegisterCurrent RegisterI C2 InterfaceVoltage FBYPASSmHigh-SideShuntLow-SideShuntLoadA lert RegisterV(Supply Voltage)SPower Supply(0 V to 28 V) FEBRUARY2012 High-or Low-SideMeasurement,BidirectionalCURRENT /POWERMONITOR withI2C InterfaceCheckforSamples:INA2301 FEATURESDESCRIPTIONTheINA230isacurrent-s huntandpowermonitor23 BusVoltageSensingFrom0 V to+28 VwithanI2 Cinterfacethatfeatures16programmable Current,Voltage, ,conversiontimes,andaveraging, HighAccuracy:combinedwithaninternalmulti plier,enabledirect (Max)readoutsofcurrentin amperesandpowerin watts.

2 50- V Offset(Max)TheINA230sensescurrentonbuses thatvaryfrom0 ConfigurableAveragingOptionsVto+28V,with thedevicepoweredfroma single ProgrammableAlertThreshold+ to+ supply,drawing330 A (typical) 40 C to+125 C. Package:3-mmx 3-mm,16-PinQFNRELATEDPRODUCTSAPPLICATION SDESCRIPTIONDEVICE SmartphonesCurrent/powermonitorwithwatch dog,peak-hold,INA209andfastcomparatorfun ctions TabletsINA210, INA211,Zer -drift,low-cost,analogcurrentshuntmonito r ServersINA212, INA213,seriesin smallpackageINA214 ComputersZer -drift,bidirectionalcurrentpowermonitorw ithINA219two-wireinterface PowerManagementHighorlowside.

3 Bidirectionalcurrent/powermonitor BatteryChargersINA220withtwo-wireinterfa ce PowerSupplies TestEquipmentHIGH-ORLOW-SIDESENSING1 Pleasebeawarethatanimportantnoticeconcer ningavailability,standardwarranty,anduse in is a 2012, (1)PRODUCTPACKAGE-LEADPACKAGEDESIGNATORP ACKAGEMARKINGINA230 QFN-16 RGTI230(1)Forthemostcurrentpackageandord eringinformationseethePackageOptionAdden dumattheendofthisdocument, (1)Overoperatingfree-airtemperaturerange (unlessotherwisenoted).INA230 UNITS upplyvoltage,VS6 VDifferential(VIN+) (VIN )(2) 30to+30 VAnaloginputs,IN+,IN Common-mode +30 VSDAGND +6 VSCLGND + 65to+150 CJunctiontemperature+150 CHumanbodymodel(HBM)2500 VESDR atingsCharged-devicemodel(CDM)1000 VMachinemodel(MM)150V(1) ,andfunctionaloperationofthedeviceatthes eoranyotherconditionsbeyondthosespecifie dis notimplied.

4 (2)VIN+andVIN mayhavea differentialvoltageof 30V to+30V;however,thevoltageatthesepinsmust notexceedtherange to+ 2012, FEBRUARY2012 ELECTRICALCHARACTERISTICSAtTA= +25 C,VS= + ,VIN+= 12V,VSENSE= (VIN+ VIN ) = 0 mV,andVBUS= 12V, += 0 V to+28V100120dB 10 50 VVOSS huntoffsetvoltage,RTI(1)TA= 40 C to+125 V/ CPSRR vspowersupplyVS= + to+ V/VBUSINPUTB usvoltageinputrange(2)028V 5 30mVVOSB usoffsetvoltage,RTI(1)TA= 40 C to+125 C1040 V/ CPSRR vspowersupply2mV/VBUS pininputimpedance830k INPUTIIN+, IIN-Inputbiascurrent10 AInputleakage(3)(VIN+) + (VIN ), V1 40 C to+125 C1050ppm/ 40 C to+125 C1050ppm/ CDifferentialnonlinearity 000140154 sCTbit= 001204224 sCTbit= 010332365 sCTbit= 011588646 sADCconversiontimeCTbit= (4)2835msDIGITALINPUT/OUTPUTI nputcapacitance3pFLeakageinputcurrent0 VIN (VS)6 VVILLow-levelinputvoltage (VS)VVOLLow-leveloutputvoltage(SDA,ALERT )IOL= 3 (1)RTI= Referred-to-input.

5 (2)Althoughtheinputrangeis 28V,thefull-scalerangeoftheADCscalingis (3)Inputleakageis positive(currentflowingintothepin) (4)SMBustimeoutin theINA230resetstheinterfaceanytimeSCLis 2012,TexasInstrumentsIncorporated3 INA230 SBOS601 (continued)AtTA= +25 C,VS= + ,VIN+= 12V,VSENSE= (VIN+ VIN ) = 0 mV,andVBUS= 12V, + + APower-onresetthreshold2 VTEMPERATURES pecifiedrange 40+125 CTHERMALINFORMATIONINA230 THERMALMETRIC(1)RGT(QFN)UNITS10 PINS JCtopJunction-to-case(top) C/W JCbotJunction-to-case(bottom) (1)Formoreinformationabouttraditionaland newthermalmetrics,seetheICPackageThermal Metricsapplicationreport, 2012,TexasInstrumentsIncorporatedProduct FolderLink(s):INA230A1A0 ALERTSDAIN-BUSGNDVS+12341211109 NCNCNCIN+ FEBRUARY2012 PINCONFIGURATIONSRGTPACKAGEQFN-16(TOPVIE W)PINDESCRIPTIONSPINANALOG/ ,SCL,SDA,orVS.

6 Table7 ,SCL,SDA,orVS. Table7 , ,7,8,14,15,16 NointernalconnectionSCL5 DigitalinputSerialbusclockline, ,open- + , 2012,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLink(s):INA230 ADC Shunt VoltageChannelBus VoltageChannelShunt Voltage(1)Data RegistersCalibration(2)Current(1)Bus Voltage(1)Power(1)INA230 SBOS601 (1)Read-only(2) 2012,TexasInstrumentsIncorporatedProduct FolderLink(s):INA230 60 50 40 30 20 1001101001k10k100kFrequency (Hz)Gain (dB)G001 50 45 40 35 30 25 20 15 10 505101520253035404550 50 45 40 35 30 25 20 15 10 505101520253035404550 Input Offset Voltage ( V)G002 Population 10 9 50 250255075100125 Temperature ( C)Offset ( V)G003140150160170 50 250255075100125 Temperature ( C)Common-Mode Rejection Ratio (dB)G0040100200300400500600 50 250255075100125 Temperature ( C)Gain Error (m%)G006 500 400 300 200 1000100200300400500 500 400 300 200 1000100200300400500 Shunt Gain Error (m%)

7 FEBRUARY2012 TYPICALCHARACTERISTICSAtTA= +25 C,VS= + ,VIN+= 12V,VSENSE= (VIN+ VIN ) = 0 mV,andVBUS= 12V, 2012,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLink(s):INA230 5005010015020025030004812162024283236 Common Mode Input Voltage (V)Gain Error (m%)G007 15 5 5 15 5 5 Offset Voltage (mV)G008 Population 50 250255075100125 Temperature ( C)Offset (mV)G009 500 400 300 200 1000100200300400500 500 400 300 200 1000100200300400500 Input Gain Error (m%)G010 Population0100200300400500600 50 250255075100125 Temperature ( C)Gain Error (m%)G011051015202504812162024283236 Common-Mode Input Voltage (V)Input Bias Current ( A)G012 INA230 SBOS601 (continued)AtTA= +25 C,VS= + ,VIN+= 12V,VSENSE= (VIN+ VIN )

8 = 0 mV,andVBUS= 12V, 2012,TexasInstrumentsIncorporatedProduct FolderLink(s):INA2301618202224 50 250255075100125 Temperature ( C)Input Bias Current ( A)G013 2060100140180220260 50 250255075100125 Temperature ( C)Input Bias Current Shutdown (nA)G014 100200300400500 50 250255075100125 Temperature ( C)Quiescent Current ( A)G015 50 250255075100125 Temperature ( C)Quiescent Current Shutdown ( A)G016 1101001,00010,000 Frequency (kHz)500450400350300I ( A)Qm1101001,00010,000 Frequency (kHz)300250200150100500 Shutdown I ( A) FEBRUARY2012 TYPICALCHARACTERISTICS(continued)AtTA= +25 C,VS= + ,VIN+= 12V,VSENSE= (VIN+ VIN )

9 = 0 mV,andVBUS= 12V, , CLOCKFREQUENCYSHUTDOWNIQvsI2C 2012,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLink(s):INA230 INA230 SBOS601 a ,voltage, , ,beginningwithTable2. SeeFigure1 fora ,usea F (ADC) shuntresistorcreatestheshuntvoltagesigna lthatis measuredattheIN+andIN typicallypoweredbya beingmonitoredcanrangein voltagefrom0 V ,a full-scaleregisterwouldresultina , ;therefore,thebusvoltagecanbepresentwith thesupplyvoltageoff, ,theINA230takestwomeasurements, ,basedontheCalibrationregistervalue, ,continuousandtriggered, (thatis,theMODE bitsoftheConfigurationregisteraresetto'1 11'),it continuouslyconvertsa shuntvoltagereadingfollowedbya ,thecurrentvalueis calculatedbasedonEquation3.

10 Thiscurrentvalueisthenusedtocalculatethe powerresultusingEquation4. Thesevaluesaresubsequentlystoredinanaccu mulator, theCalibrationregisteris notprogrammed, , ,thefinalvaluesforshuntvoltage,busvoltag e,current, conversionin ,writinganyofthetriggeredconvertmodesint otheConfigurationregister(thatis,theMODE bitsoftheConfigurationregisteraresetto 001 , 010 , or 011 ) triggersa ,theConfigurationregistermustbewrittento again,evenif (continuousandtriggered),theINA230alsoha sa power-downmodethatreducesthequiescentcur rentandturnsoffcurrentintotheINA230input s,whichreducestheimpactofsupplydrainwhen thedeviceis 2012,TexasInstrumentsIncorporatedProduct FolderLink(s).