Texas Instruments FPTVEH Radio Frequency Identification Transponder User Manual 11 09 05 700

Texas Instruments Inc Radio Frequency Identification Transponder 11 09 05 700

Contents

Hardware Specification

A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T S Originator:INFORMATION Phillip LaCroixT I R I S Effective Date:Internal Data S P E C I F I C A T I O N July 14, 1999Revision: Date:Approval: Approval: Approval:Function: Engineering Function: Operations Function: QualityName: Loek D’Hont Name: Paul Angelo Name: Larry VidalDate: Date: DateRI-TRP-VUSA – Hardware Specification Page 1 of 20 11-09-05-700Hardware SpecificationforLUHF Vehicle Transponder (U.S.)RI-TRP-VUSAPRINTED COPIES OF THIS SPECIFICATIONARE NOT CONTROLLED DOCUMENTS.VERIFY THEIR CORRECT REVISION BEFORE USING.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 2 of 20 11-09-05-700TABLE OF CONTENTS1. INTRODUCTION ……………………………………………………………………………..…..…...41.1 SCOPE..........................................................................................................................41.2 APPLICABLE DOCUMENTS ...............................................................................................41.3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS .................................................................52. FUNCTIONAL AND OPERATIONAL REQUIREMENTS ………………………………….62.1 SYSTEM OVERVIEW........................................................................................................63. PERFORMANCE REQUIREMENTS ..……………………………………………………….83.1 PHYSICAL CHARACTERISTICS ..........................................................................................83.1.1 Dimensions...........................................................................................................83.1.2 Weight..................................................................................................................83.1.3 Housing ................................................................................................................83.1.4 Battery..................................................................................................................83.1.5 Transponder Mounting..........................................................................................83.2 ELECTRICAL CHARACTERISTICS .......................................................................................83.2.1 Radio Frequency Characteristics - Downlink .........................................................83.2.2 Radio Frequency Characteristics - Uplink..............................................................93.2.3 Transponder data ...............................................................................................103.2.4 Processor Characteristics ...................................................................................103.2.5 Current Consumption Characteristics..................................................................113.2.6 Operation at Temperature Extremes ...................................................................114. INTERFACE REQUIREMENTS ……………………………………………………………..124.1 DISPENSER CONTROLLER BOARD INTERFACES ...............................................................124.1.1 Downlink message format (poll) ..........................................................................124.1.2 Uplink message format (response)......................................................................124.2 PROGRAMMING STATION INTERFACES............................................................................125. ELECTROMAGNETIC INTERFERENCE REQUIREMENTS ……………………………135.1 GENERAL ....................................................................................................................135.2 RADIATED EMISSION.....................................................................................................135.3 RADIATED SUSCEPTIBILITY............................................................................................135.4 ELECTRIC / MAGNETIC FIELD DAMAGE SUSCEPTIBILITY....................................................136. REGULATORY REQUIREMENTS ………………………………………………………….116.1 FCC REQUIREMENTS...................................................................................................147. QUALITY ASSURANCE PROVISIONS……………………………………………………..157.1 INSPECTION.................................................................................................................157.2 TESTING .....................................................................................................................15
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 3 of 20 11-09-05-7007.3 MATERIALS..................................................................................................................157.3.1 Toxic Products and Formulations ........................................................................157.3.2 Workmanship......................................................................................................157.4 RELIABILITY REQUIREMENTS .........................................................................................167.4.1 Reliability Performance .......................................................................................167.5 ENVIRONMENTAL REQUIREMENTS..................................................................................168. PREPARATION FOR DELIVERY …………………………………………………………………188.1 PACKING AND PACKAGING.............................................................................................188.2 ELECTROSTATIC (ES) PRPTECTION ...............................................................................189. BATTERY LIFE CALCULATION …………………………………………………………...19
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 4 of 20 11-09-05-7001. INTRODUCTION1.1 SCOPEThis document describes the implementation of the FCC compliant Vehicle Transponder for the ARCcustomer identification system. The scope of this document includes the performance requirementsfor the U.S. vehicle transponder and the interface definition between the transponder and other majorassemblies in the ARC system.If anything in this document is ambiguous or incorrect, it should be immediately reported to theProject Managers for the ARC Team, and corrected. The document should then be approved by allthe concerned individuals on the cover page and redistributed to all parties involved.1.2 APPLICABLE DOCUMENTSThe hierarchy of documentation pertaining to the ARC system is depicted below. As this tableappears in each of the documents, it is important that revisions to any document in the family bereflected in this table.DocumentNumber Document TitleTIRIS2001 Mobil Speedpass System Customer Requirements Product Specification06-01-02-700 ARC System Specification for Retail Fueling Applications11-09-05-702 ARC Digital Control Board Hardware Specification - RI-CTL-DCUA11-09-05-703 ARC UHF Receiver Daughter-Board Specification (US) - RI-RFM-HRUA11-09-05-700 Hardware Specification for LUHF Vehicle Transponder (U.S.)11-09-05-701 Software Specification for LUHF Vehicle Transponder (U.S.)11-09-05-704 ARC LUHF Vehicle Transponder Programmer SpecificationARC System Qualification Test Procedure & Manufacturing / QA/QC Procedures per TQMStandards.FCC Part 15, Class B
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 5 of 20 11-09-05-7001.3 DEFINITIONS, ACRONYMS, AND ABBREVIATIONSARC Automatic Recognition of ConsumersASK Amplitude Shift KeyingDCB Digital Control BoardDST Digital Signature TransponderES ElectrostaticETSI European Telecommunication Standards InstituteFCC Federal Communications CommissionFSK Frequency Shift KeyingIPC Interconnecting and Packaging Electronic CircuitsLF Low FrequencyMTBF Mean Time Between FailurePLL Phase Locked LoopPOS Point of SaleUHF Ultra High FrequencyUplink RF Data Transmission from the Transponder to the ReaderDownlink RF Data Transmission from the Reader to the Transponder
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 6 of 20 11-09-05-7002. FUNCTIONAL AND OPERATIONAL REQUIREMENTSThe ARC system, when installed in a fuel dispenser which offers pay-at-the-pump functionality,provides hands-free identification of a customer and/or the customer’s vehicle. The system offerspay-at-the-pump convenience, without requiring the insertion of a credit card or any keypad entries.The U.S. Vehicle Transponder is the component of the system placed in the customer's vehicle. Whenactivated by a ARC dispenser, the transponder provides identification and authentication data via aradio frequency link to the dispenser. An overview of the complete ARC system is provided in theARC System Specification, 06-01-02-700.2.1 SYSTEM OVERVIEWAn overview of the U.S. vehicle transponder is depicted in Figure 2-1 below. The major functionalblocks of the transponder are the downlink network, the processor, and the uplink network.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 7 of 20 11-09-05-700DigitalControllerBoardDownlinkNetworkUplinkNetworkData Processingand StorageLUHF Vehicle TransponderLFDownlinkUHFUplinkFigure 2-1. U.S. Vehicle Transponder Block Diagram.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 8 of 20 11-09-05-7003. PERFORMANCE REQUIREMENTSTop-level customer specific system performance requirements are defined in the applicable CustomerRequirements Product Specifications detailed in Section 1.2. This section augments and clarifiesthose requirements pertaining to the vehicle transponder, as appropriate.3.1 PHYSICAL CHARACTERISTICS3.1.1 DimensionsThe transponder shall be fully contained within a 58.mm x 44.5mm x 24.mm space. The maximumdimensions of the transponder shall not exceed this space in any direction.3.1.2 WeightThe transponder shall weigh no more than 0.5 lbs.3.1.3 HousingThe transponder shall be enclosed in a plastic housing, type PC/ASA.3.1.4 BatteryThe transponder housing shall provide access to the replaceable battery. The battery is a coin cell,type 2032. The chemistry of the battery will be Li-MnO2 or equivalent approved by TexasInstruments to ensure compliance with this specification.3.1.5 Transponder MountingThe transponder shall be mounted in the lower middle of the rear window using "hook and loop" or"ball and cup" fasteners with adhesive attachment to the window and to the transponder.3.2 ELECTRICAL CHARACTERISTICS3.2.1 Radio Frequency Characteristics - DownlinkThe transponder shall detect and process signals, which consist of the following properties:
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 9 of 20 11-09-05-700Property RequirementCarrier Frequency 134.2 kHz +/- 100 ppmActivation Field Strength Level (at thetransponder surface) 34 mA/m +/- 7 mA/m, at the optimum transponderorientationAt a 45° rotation from optimum, an additional 3dBof field strength is required.The transponder must be separated from anymetallic material by a minimum of 3 cm.Max. Operating Field Strength (at thetransponder surface) 500 mA/mModulation ASKModulation Depth > 95 %Data Encoding FM0Data Rate 1 kbps +/- 100 ppmDuty Cycle of received FM0 signal 50 +/- 5%The transponder shall successfully process signals with these properties while in the operatingtemperature range specified in section 7.5.3.2.2 Radio Frequency Characteristics - UplinkThe output signals from the transponder shall conform to the following properties:Property RequirementVirtual Carrier Frequency 902.8 MHzCarrier Frequency Accuracy +/- 100 ppmTotal Radiated Power -20 dBm +/- 3dBSpurious Emissions -36 dBm maximum (250 nW)Modulation FSKVirtual Carrier Frequency Drift within one Transmission 10 kHz maximumFrequency Deviation 40 kHz maximumDigital high level encoding Positive frequency deviationDigital low level encoding Negative frequency deviationData Encoding ManchesterData Rate 20 kbps +/- 100 ppmDuty Cycle of transmitted signal 50 +/- 10%
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 10 of 20 11-09-05-700The transponder shall transmit signals with these properties while in the operating temperature rangespecified in section 7.5.3.2.3 Transponder dataThe transponder shall have the capability of storing data in non-volatile memory. Data may be loadedinto the transponder at three possible locations: the transponder manufacturing facility; thetransponder distribution center; and at Third Party locations. The following table defines the data thatshall be programmed into the transponder, and the facilities where it could be programmed.Data block Programmable atFactory Programmable atDistribution Center Programmable byThird PartyTransponder IdentificationNumber (32 bits) Yes Yes NoAccount Data field, for fleetidentification (5 bits) Yes Yes YesDST data, up to 32 unique keys(40 bits each) Yes Yes NoKey activation data, to indicateprogrammed key Yes Yes YesAny data block may be programmed one time only. The DST keys shall be stored in such a way thatthey may not be read from the transponder once programmed.3.2.4 Processor CharacteristicsThe transponder processor is a dedicated microcontroller capable of operating at 1 MIPS. Theprocessor includes a crystal clock operating at 4 MHz +/- 100 ppm over the full temperature range ofthe transponder. This tolerance directly influences the accuracy of the output data rate of the uplinkdata. Refer to the ARC Vehicle Transponder Software Specification, 11-09-05-701, for detailedrequirements for the transponder software. The processor shall have two modes, Sleep and Active. The transponder shall go into its Sleep modeafter exiting a RF field with the defined RF characteristics below the maximum RF level of anincoming data 0. In Sleep mode the transponder will consume a minimal amount of current toenhance battery life. The transponder will wake-up and go into an Active mode upon entering a RFfield with the defined RF characteristics above the minimum RF level of an incoming Data 1. Onceactivated, the transponder will attempt to acquire and respond to incoming polls or else go back intoSleep mode if the RF field goes away.The processor executes tasks sequentially, and will only perform half-duplex communication. For apoll to be recognized by the processor, sufficient time must be allowed following the previousresponse. The first unique DST Challenge poll will cause the processor to save the challenge data and
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 11 of 20 11-09-05-700execute the DST algorithm. While executing the DST algorithm, the processor will not respond toany polls. The processor will response to subsequent identical DST Challenge polls using thecalculated DST Challenge Response.3.2.5 Current Consumption CharacteristicsThe transponder shall achieve a minimum battery life of three years. The battery life shall be definedthrough the functional temperature range with the defined number of fueling transactions per week.Exposure to temperatures in excess of the defined functional temperature range will reduce thebattery life.Fueling Transactions 5 per weekBattery Voltage, typical 3V (depends on battery type)Battery Voltage, allowableoperating range 2.5 V to 3.5 VBattery Capacity ~210 mAHCurrent load (Sleep) < 4 uA average over specifiedtemperature rangeCurrent load (Active) < 5 mA3.2.6 Operation at Temperature ExtremesThe transponder may not be functional outside of the defined operating temperature range. Thetransponder shall return to full functionality after returning to the operating temperature range fromthe storage temperature range, provided that there is still sufficient battery capacity available afterstorage. The operating and storage temperature ranges are defined in section 7.5.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 12 of 20 11-09-05-7004. INTERFACE REQUIREMENTSThis section defines the interfaces between vehicle transponder and relevant subsystems of the ARCsystem.4.1 DIGITAL CONTROL BOARD INTERFACES4.1.1 Downlink message format (poll)The Dispenser Controller Board communicates with the vehicle transponder by sending pollmessages in the downlink channel. The format of the downlink poll messages are defined in the ARCVehicle Transponder Software Specification, 11-09-05-701.4.1.2 Uplink message format (response)The vehicle transponder communicates with the Dispenser Controller board by sending responsemessages in the uplink channel. The format of the downlink poll messages are defined in the ARCVehicle Transponder Software Specification, 11-09-05-701.4.2 PROGRAMMING STATION INTERFACESThe programming interface shall be in accordance with Vehicle Transponder ProgrammingSpecification, 11-09-05-704.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 13 of 20 11-09-05-7005. ELECTROMAGNETIC INTERFERENCE REQUIREMENTS5.1 GENERALThe design requirements for the control of the electromagnetic emission and susceptibilitycharacteristics of the U.S. vehicle transponder shall be in accordance with MIL-STD-461DRequirements for Control of Electromagnetic Interference Emissions and Susceptibility.5.2 RADIATED EMISSIONRequirement DescriptionRE101 Radiated Emissions, Magnetic Field, 30 Hz to 100 kHz for a Land Mobileplatform.RE102 Radiated Emissions, Electric Field, 10 kHz to 18 GHz. Except for 903 +/-1 MHz, where a maximum of - 10 dBm may be present for a Land Mobileplatform.RE103 Radiated Emissions, Antenna Spurious and harmonic Output, 10 kHz to40 GHz. Except for 903 +/- 1 MHz, where a maximum of - 10 dBm maybe present for a Land Mobile platform.5.3 RADIATED SUSCEPTIBILITYRequirement DescriptionRS101 Radiated Susceptibility, Magnetic Field, 30 Hz to 100 kHz. A maximum fieldstrength of 27 mA/m is allowable.RS103 Radiated Susceptibility, Electric Field, 10 kHz to 40 GHz.. Except for 10kHz to200 kHz, where a field strength of 2.7 mA/m is allowable.5.4 ELECTRIC / MAGNETIC FIELD DAMAGE SUSCEPTIBILITYThe transponder shall withstand, without permanent damage, a field of 1 A/m in the band 0 - 200kHz, excluding 133 -135 kHz, or a field of 200 V/m in any other band.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 14 of 20 11-09-05-7006. REGULATORY REQUIREMENTS6.1 FCC REQUIREMENTSThe vehicle transponder shall comply with FCC Regulations, Part 15, Class B.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 15 of 20 11-09-05-7007. QUALITY ASSURANCE PROVISIONSThe U.S. vehicle transponder shall be designed and manufactured under a quality assurance programequivalent to ISO 9001. This does not imply that the suppliers of the design or manufacturers shall becertified to ISO 9001 but are capable of and have withstood an external audit by an independentauditor.7.1 INSPECTIONThe transponder shall be visually inspected by the supplier. The transponder shall be inspected forcompliance to the Institute for Interconnecting and Packaging Electronic Circuits (IPC) or equivalentstandard. This inspection shall be sufficient to assure performance to the requirements of thisspecification, workmanship and electrical interface.7.2 TESTINGThe transponder shall be tested for compliance to the performance requirement of paragraphs 3through 6. Test procedures shall be reviewed and approved prior to the acceptance of product.7.3 MATERIALSMaterials chosen by the supplier shall be in accordance with IPC or equivalent standards andpractices, sufficient to assure performance to the requirements of this specification.External parts, elements or coatings including marking shall be inherently non-nutrient to fungus anddo not blister, crack, outgas, soften, flow or exhibit defects that adversely affect storage, operation, orassembly.7.3.1 Toxic Products and FormulationsNo products or formulations, which are known to be toxic or harmful, shall be used without approvalby Texas Instruments Incorporated.7.3.2 WorkmanshipWorkmanship evidenced in the construction of the vehicle transponder shall be inspected forcompliance to the Institute for Interconnecting and Packaging Electronic Circuits (IPC) or equivalent,
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 16 of 20 11-09-05-700sufficient to assure performance to the requirements of this specification to the extremes of theenvironments specified herein.7.4 RELIABILITY REQUIREMENTS7.4.1 Reliability PerformanceThe reliability of the transponder shall be designed to meet or exceed the design goals documented inthe table below. The reliability prediction technique shall utilize MIL-HDBK-217 or Bell Core,Method 1, at 25 degrees C, as a guideline.Module MTBF *(hours, Repairable)MTTF **(hours, Non-repairable)Survival Probability (3 years)LUHF Vehicle Transponder(excluding Battery) 1,000,000 .974Table 7-1. Reliability Requirements* MTBF - Mean Time Between Failure which are repairable.** MTTF - Mean Time to Failure which are non-repairable.7.5 ENVIRONMENTAL REQUIREMENTSThe U.S. vehicle transponder is to meet applicable sections defined in the applicable CustomerRequirements Product Specifications detailed in Section 1.2.The critical operating environmental guidelines are as follows:- Operating temperature: Operating temperature tests in accordance with MIL-STD-202F,method 102A, temperature cycling or equivalent, using the following parameters: -10 to +85degrees C, duration 500 hours. Transponder may have degraded operational performance to -20degrees C.- Storage temperature (battery removed): Storage temperate tests in accordance with MIL-STD-810D, method 502.2, using the following parameters: Low temperature - 40 degrees C 1000hours, High temperature 104 degrees C, 1000 hours.- Shock Environment: Shock test performed in accordance with Mil-STD-810D, Method 516.3 orequivalent using the following parameters: 30 G's at 10 mS, half sinusoidal wave, 6 axes.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 17 of 20 11-09-05-700- Vibration Environment: Vibration tests in accordance with MIL-STD-810E, Method 514.4 orequivalent, using the following parameters: 10 to 500 Hz, 10 g peak, 30 minutes sweep,logarithmic.- Humidity Environment (battery removed): Humidity tests in accordance with MIL-STD-810D,Method 507.2, procedure III, aggravated screening or equivalent, using the following humidityparameters: 85 percent relative humidity, non-condensing at 85o C, duration 500 hours.- Thermal Shock (battery removed): Thermal Shock testing in accordance with MIL-STD-810D,Method 503.2 or equivalent, using the following thermal shock parameters: - 40 to 85 degrees C,100 cycles duration.- Drop: Drop from 1m onto a 1-inch thick maple block, 1 drop per side on all surfaces.Operational functionality and structural integrity shall not be compromised. The battery cover isallowed to fall off of the transponder as long as it is not damaged and can be replaced into theunit.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 18 of 20 11-09-05-7008. PREPARATION FOR DELIVERY8.1 PACKING AND PACKAGINGPreservation, packaging, and packing of system and subsystems to be delivered shall be to thesupplier's best commercial practice to prevent deterioration and mechanical damage in shipment andin storage.8.2 ELECTROSTATIC (ES) PROTECTIONThe ARC system and subsystems shall meet an ES level of 2000 volts minimum using a standardbody model.
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 19 of 20 11-09-05-7009. BATTERY LIFE CALCULATIONBattery Load Conditions* Standby ConditionsLoad Current: 2 uADuration: 100% of time* Active ConditionsDuration: 5 transactions / week, assuming 5 minutes / transactionContinuous Load:1 mAPulsed Cycle Load: (* Additional to Continuous Load)Cycle Time: 200 mSPulse Time: 6 mSPulsed Load: 4 mA* Temperature:Range: -10C to +85C (Operational)Hot %: 15% (+85C)Cold %: 15% (-10C)* Minimum Operational Voltage: 2.5V* Battery Self Discharge: < 5% / year* Battery Energy:210 mA-HourEnergy Usage per Year*Self Discharge Energy per Year: 10.50 mA-Hour(210 mA-Hour * 5%)*Standby Energy per Year: 17.52 mA-Hours(2 uA * 24 Hours/Day * 365 Days/Year)* Active Energy per Year:
A92FPTVEH – Attachment 2TI PROPRIETARY T E X A S I N S T R U M E N T SINFORMATION Revision:T I R I SInternal Data S P E C I F I C A T I O NRI-TRP-VUSA – Hardware Specification Page 20 of 20 11-09-05-700Continuous: 21.67 mA-Hours(1 mA * [(5 Min/Day)/ (60 Min/Hour)]* 5 Days/Week * 52 Weeks/Year)Pulsed: 2.60 mA-Hours(4 mA * [(6 mS/200 mS * 5 Min/Day)/(60 Min/Hour)] * 5 Days/Week * 52 Weeks/Year) ==================== Total 52.29 mA-Hours/YearCalculated Life: 4.02 Years(210 mA-Hour / 52.29 mA-Hour/Year)

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