LTC2949 (Rev. A) - Analog Devices

1 LTC29491 Rev AFor more information FeedbackTYPICAL APPLICATION FEATURESDESCRIPTIONC urrent, Voltage, and Charge Monitor for high Voltage Battery PacksThe LT C 2949 is a high precision current, voltage, tem-perature, charge and energy meter for electrical and hybrid vehicles and other isolated current sense applications. It infers charge and energy flowing in and out of the battery pack by monitoring simultaneously the voltage drop over up to two sense resistors and the battery pack offset ADCs ensure accurate measurement of voltage and current with insignificant power loss. Con-tinuous integration of current and power ensures lossless tracking of charge and energy delivered or received by the battery built-in serial interface can be configured to support isolated isoSPI communication to the host or as SPI LTC2949 features 12 internally buffered high imped-ance inputs (V1 to V12) for measuring voltages from external sensors or resistor dividers allowing to measure temperatures, HV-Link voltages, chassis isolation and supervise contactor states.

2 LTC2949 has up to five pro-grammable digital outputs which can be set to ground, supply or toggling at threshold and tracking registers reduce digital traffic to the Vehicle Battery MeterAPPLICATIONS nElectric and Hybrid Vehicles nIsolated Current Sensing nBackup Battery Systems nHigh Power Portable EquipmentAll registered trademarks and trademarks are the property of their respective owners. nMeasures Battery Stack Voltage, Current and Power nIndicates Accumulated Battery Charge and Energy n20-Bit Current Measurement with <1 V Offset nBuilt-In Isolated isoSPI or SPI Interface nLTC68xx/ADBMS68xx Compatible, Supports Synchronous Measurements with Cell Monitors nUp to 12 Buffered Voltage Measurement Inputs nUp to 5 GPIOs, Configurable to Drive Ground, Supply or Toggling at 400kHz nHigh or Low Side Current Sense Current and Voltage Accuracy n1% Energy and Charge Accuracy nTrue Average ADCs nI2C EEPROM Interface to Store Board Calibration Factors nThreshold Registers for all Measured Quantities nEngineered for ISO26262 Compliant Systems nOpen Wire Detection on Input Pins nAvailable in 48-Lead LQFP Package nAEC-Q100 Qualified for Automotive Applications2949 FSTD4NK100Z30kMASTERGNDLTC2949 BATPI1PI2PV1isoSPIHVLINK+HVLINK VREFV5V3 BATMI1MI2 MGNDV2 SPICHASSIS-GNDGPIO1 HVBAT HVBAT+800 VCELLMONITORSV4isoSPI ALTC681xisoSPI BisoSPI ALTC681xisoSPI BSTACKVOLTAGETEMPERATURELINK VOLTAGELINK VOLTAGELTC6820 AVCCDVCCCURRENTCHARGEPOWERENERGYSPIisoSP IGNDISOLATIONRESISTANCEISOLATED COMMUNICATION LT830x LTC2949 2 Rev AFor more information OF

3 CONTENTS Features ..1 Applications ..1 Typical Application .. Maximum Ratings ..3 Order Information ..3 Pin Configuration ..3 Electrical Characteristics ..4 Typical Performance Characteristics ..10 Pin Functions ..11 Pin Functions ..12 Block Diagram ..14 Modes of Operation ..15 Data Acquisition Channels ..16 Power Measurement ..19 Charge, Energy and Time ..20 Overcurrent Comparators ..21 SERIAL INTERFACES ..22 Serial Interfaces Overview ..224-Wire Serial Peripheral Interface (SPI) Physical Layer ..222-Wire Isolated Interface (isoSPI) Physical Layer ..23 Data Link Layer ..28 Network Layer ..28 REGISTER MAP ..41 REGISTER Description ..42 MEMORY MAP AND Paging Map PAGE0 ..44 Register Map PAGE1 ..62 Application Information ..68 Temperature Measurement ..68 Sense resistor Temperature Compensation.

4 69 Current and Voltage Input Filtering ..74 Powering the LTC2949 ..75 Package Description ..78 Revision History ..79 Typical Application ..80 Related Parts ..80 LTC29493 Rev AFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGS(Notes 1, 2)12345678910111236353433323130292827262 5V1V2V3V4V5 DNCV6V7V8V9V10V1113141516171819202122232 4V12 SCLSDABYP1 DGNDAGNDAVCCDVCCDNCDNCDNCDNC484746454443 424140393837 VBATPVBATMDNCI1 PCF1 PCF1MI1MI2 MCF2 MCF2PI2 PDNCDNCVREFCLKOCLKIDNCDNCCSB (IM)SCK (IP)SDO (IBIAS)SDI (ICMP)IOVCCBYP2 TOP VIEWLXE PACKAGE48-LEAD (7mm 7mm) PLASTIC LQFPDNC: DO NOT CONNECTTJMAX = 150 C, JA = C/W, JC = C/WEXPOSED PAD (PIN 49), CONNECT TO AGND49 GNDORDER INFORMATIONAUTOMOTIVE PRODUCTS**TRAY (250PC)TAPE AND REEL (2000PC)PART MARKING*PACKAGE DESCRIPTIONMSL RATINGTEMPERATURE RANGELTC2949 ILXE#3 ZZPBFLTC2949 ILXE#3 ZZTRPBFLTC2949 LXE48-LEAD PLASTIC eLQFP3 40 C to 85 CLTC2949 HLXE#3 ZZPBFLTC2949 HLXE#3 ZZTRPBFLTC2949 LXE48-LEAD PLASTIC eLQFP3 40 C to 125 CContact the factory for parts specified with wider operating temperature ranges.

5 *The temperature grade is identified by a label on the shipping and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #3ZZ suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these PinsAVCC to AGND .. to to to to DVCC .. to to AGND.. to PinsI1P, I1M, I2P, I2M .. to VAVCC + to I1M, I2P to I2M .. 1 VVBATP, VBATM .. to VAVCC +.

6 To VAVCC + , (Note 3)Digital Input/Output PinsIOVCC, CLKI, CSB(IM), SCK(IP).. to 5 VSDI (ICMP), SDO (IBIAS) .. to 5 VSDA, SCL .. to In/Out of PinsI P, I M .. 30mASDO (IBIAS) .. 1mA to 9mAV8-V12 .. 2mAVREF (Note 4) .. 2mA BYP1 (Note 4) .. 10mA to 0mABYP2 (Note 4) .. 10mA to 0mAOperating Ambient Temperature RangeLTC2949I .. 40 C to 85 CLTC2949H .. 40 C to 125 CStorage Temperature .. 65 C to 150 CLTC2949 4 Rev AFor more information CHARACTERISTICSSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITSP ower SupplyVAVCCA nalog Supply Supply Undervoltage Lockout ThresholdVAVCC, VDVCC Supply Current into AVCC and DVCCCore State: STANDBY or MEASUREl1620mACore State: SLEEP915 ACore State: SLEEPl150 AAdditional DVCC Supply Current if isoSPI in READY/ACTIVE StatesNote: ACTIVE State Current Assumes tCLK = 1 s, (Note 5)RB1 + RB2 = + RB2 = Regulated Output Load Currentl 100mABYP1 Load Regulation ErrorILOAD = 10mAl 150mVBYP1 Undervoltage Lockout Regulation Output Load Currentl 100mABYP2 Load Regulation ErrorILOAD = 10mAl 60mVThermal Shutdown Temperature170 CCurrent Sense ADCR esolution (No Missing Codes)Slow Mode Filtered (Note 7)l20 BitSlow Mode (Note 7)l18 BitFast Mode (Note 7)

7 L15 BitFull-Scale Differential Input VoltageVI1P-VI1M, VI2P-VI2M 124mVVDIFID ifferential Input Voltage RangeVI1P-VI1M, VI2P-VI2Ml 110mVPin Voltage of I1P, I1M, I2P, I2Ml + Sense Quantization StepSlow Mode Mode950nVFast VCFPxInput Leakage Current at CF1P, CF1M, I1P, I1M, CF2P, CF2M, I2P, I2 MCore State = SLEEP/STANDBYl60nADifferential Input Current from CF1P to CF1M, CF2P to CF2 MCore State: MEASURE; Pin Voltages: 0V VCF1P, VCF1M, VI1P, VI1M, VCF2P, VCF2M, VI2P, VI2M VAVCCVDIFI/100k ANoiseSlow Mode Filtered160nVRMSSlow Mode 320nVRMSFast Mode3 VRMSGain Error|VDIFI| VoltageIADCx, IxP, IxM = 0 VVAVCC = VDVCC = 5 VSlow Model0 1 VFast Model0 2 VTotal Unadjusted Error|VDIFI| The l denotes the specifications which apply over the full operating temperature range.

8 Otherwise specifications are at TA = 25 AFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 Voltage Common Mode Rejection at DCl100dBInput Sampling TimeSlow Mode Filtered400msSlow Mode100msFast Measurement by Power ADCR esolution (No Missing Codes)Slow Mode (Note 7)l18 BitFast Mode (Note 7)l15 BitVFSVFull-Scale Differential Input VoltageVVBATP VVBATM Input Voltage RangeVVBATP VVBATMl Voltage of VBATP, VBATMVAVCC 5Vl + < 5Vl Input Voltage Quantization StepSlow VFast VInput Leakage CurrentCore State: SLEEP/STANDBYl60nADifferential Input ResistanceCore State: MEASURE.

9 Pin Voltages 0V VBATP, VBATM VAVCC50M l20M Gain = VBATM = 0Vl0 3 LSBVV oltage Total Unadjusted Error1V |VDIFV| Voltage Common Mode Rejection at DCl80dBNoiseSlow Mode (Note 7)3 VRMSFast Mode (Note 7)30 VRMSI nput Sampling TimeSlow Mode100msFast Measurement by Power ADCR esolution (No Missing Codes)Slow Mode (Note 7)l18 BitFast Mode (Note 7)l11 BitFSPFull-Scale PowerFSP = VFSV VFSI/RISENSE/VDIVv [V2/ ]LSBPP ower Quantization StepLSBP = [V2/ ]POSP ower OffsetVDIF1 = 01 LSBPTUEPP ower Total Unadjusted Error1V |VDIFV| , 25mV |VDIFI| NoiseSlow Mode; VBATP VBATM = (Note 7) Mode; VBATP VBATM = 0V (Note 7) Sampling Modulation TimeSlow Mode100msFast 6 Rev AFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 MeasurementTUEEE nergy Total Unadjusted Error1V |VDIFV| , 25mV |VDIFI| 110mV, Ideal External Clock or 4 MHz |VDIFV| , 25mV |VDIFI| 110mV, Internal Charge MeasurementTUECC harge Total Unadjusted Error1V |VDIFV| , 25mV |VDIFI| 110mV, Ideal External Clock or 4 MHz |VDIFV| , 25mV |VDIFI| 110mV.

10 Internal Voltage Measurement by AUXILIARY ADCR esolution (No Missing Codes)(Note 7)l15 BitVFSAUXFull-Scale Differential Input VoltageVVBATP VVBATM, VMUXP VMUXN Input Voltage RangeVVBATP VVBATM, VMUXP VMUXNl Voltage of VBATP, VBATM, V1 V12, CF1P, CF1M, CF2P, CF2 MVAVCC 5Vl + < 5Vl Voltage Quantization StepSlow Mode375 VFast VInput Leakage Currentl160nADifferential Input Resistancel40M Gain Error|VDIFAUX| = VBATM = 0Vl0 1 LSBVT otal Unadjusted Error1V |VDIFV| Voltage Common Mode Rejection at DCl80dBSampling Temperature Measurement by AUXILIARY ADCR esolution (No Missing Codes)(Note 7)l13 BitFull-Scale TLSBT emperature Quantization Unadjusted Error 3 KConversion Voltage Measurement by AUXILIARY ADCR esolution (No Missing Codes)(Note 7)l14 BitFull-Scale Differential Input Measurement Quantization Unadjusted Errorl2 5%Conversion MUXS ignal Rangel + AFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range.