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RF-Powered, PassiveWireless Sensor Tags and  High-Function RFID      Sensors Expo 2012       Chicago, IL (USA)           w...
RFID Opportunity Overview• Basic tags are low-cost and pervasive• RFID chips are designed for range• High function tags ar...
RF Power SourcesIntentional   Anticipated                   Unknown                                              ?        ...
Perspective: Communication vs. Power                                    RF Sensitivity of Wireless Devices                ...
Powerharvester® Receivers   Convert RF input to DC current                                  RF                           ...
Powerharvester® Chipset / Reference DesignFeatures / Performance Output from 2 to 5V (higher with custom design) Wide tu...
RFID Tag Power RequirementsPower                                                Sensors                                   ...
Power Harvesting for High-Function RFID                                                                 Sensor            ...
RF-power for Bi-Stable DisplaysColor Indicators                         Small Displays                 Large Displays Sour...
850MHz Bandwidth                                          P2110 Normalized Efficiency                                     ...
Wide Input Power Range for Short & Long Distance                                     80                                   ...
Harvested Power @ 915MHz                       60                                                                         ...
Harvested Power @ 915MHz                        1                                                                         ...
P1110/P2110 Hybrid for RFID                        Charge Time for Sustained 3V Regulated Output                        16...
Passive Wireless Sensor Tag Demo   P2110 RF Powerharvester                                                    Radio module...
Productized PWST                                                 Operated at 80 feet                                      ...
Sensor Tag Development ToolCredit card                                                  Programmingform factor            ...
915MHz(ft.) vs. AverageSensor Tag                                             Distance                                    ...
13.56MHz (HF RFID) – Efficiency                               45                                                          ...
13.56MHz (HF RFID) – Harvested Power                       7             Preliminary designs support charging             ...
Summary• Great opportunities for  high-function RFID• RF power harvesting is a  key enabler• Core RF circuit design can  s...
Powercast Resrouces• Documentation       – http://www.powercastco.com/resources/• Wireless power calculator (Excel)       ...
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PWST and High Function RFID

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Passive Wireless Sensor Tags and High-Function RFID tags are enabled by RF Power Harvesting from RFID infrastructure or other dedicated RF power transmitters.

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PWST and High Function RFID

  1. 1. RF-Powered, PassiveWireless Sensor Tags and High-Function RFID Sensors Expo 2012 Chicago, IL (USA) www.powercastco.com ©2012 Powercast Corporation 1
  2. 2. RFID Opportunity Overview• Basic tags are low-cost and pervasive• RFID chips are designed for range• High function tags are limited by power• Add-on power harvesting provides significantly more power for tags• More Power Greater Function, Higher Value www.powercastco.com ©2012 Powercast Corporation 2
  3. 3. RF Power SourcesIntentional Anticipated Unknown ? www.powercastco.com ©2012 Powercast Corporation 3
  4. 4. Perspective: Communication vs. Power RF Sensitivity of Wireless Devices CommunicationPower Requirement mA Passive RFID uA Wake-up Receiver Mobile phones, 0 - nA 802.15.4/ZigBee, Power Harvesting WiFi, Active RFID -100 -75 -50 -25 0 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 4
  5. 5. Powerharvester® Receivers Convert RF input to DC current RF Power I/O Power/charge management Frequency range: 850-950MHz RF Power I/O RSSI and Data output Capacitor P1110 P2110• Continuous Power Output • Pulsed Power Output• Input power: -5 to 20 dBm • Input power: -12 to 15 dBm• Output voltage: up to 4.2V • Output voltage: up to 5.25V www.powercastco.com ©2012 Powercast Corporation 5
  6. 6. Powerharvester® Chipset / Reference DesignFeatures / Performance Output from 2 to 5V (higher with custom design) Wide tunable range: 1MHz to 6GHz RF harvesting down to around -12dBm input Small footprint: 0.2 in2 / 1.3 cm2 Low BOM Cost RF Harvesting Circuit • Powercast chipset (3 custom ICs) • 20-25 other discrete components www.powercastco.com ©2012 Powercast Corporation 6
  7. 7. RFID Tag Power RequirementsPower Sensors Computation Screen Update Memory Access ID read ID Memory High-Function Tag Tag Tag www.powercastco.com ©2012 Powercast Corporation 7
  8. 8. Power Harvesting for High-Function RFID Sensor High-Function Tag Tags • Identification • Sensors Biometric • Processing Proximity • Biometrics Cards • Bi-stable displays • Battery charging • Low-power radioRFID / Access Control • LEDsReader ePaper • Audio Signs / Labels Powercast receivers provide 10X power efficiency vs. RFID chips www.powercastco.com ©2012 Powercast Corporation 8
  9. 9. RF-power for Bi-Stable DisplaysColor Indicators Small Displays Large Displays Sources: adt GmbH, Vanguard ID Systems, Tego, Pervasive Displays www.powercastco.com ©2012 Powercast Corporation 9
  10. 10. 850MHz Bandwidth P2110 Normalized Efficiency -3dBm (500uW) Input 1.2 1Normalized Efficiency 0.8 0.6 ±20% over 850MHz 0.4 0.2 0 500 700 900 1100 1300 1500 1700 Frequency (MHz) www.powercastco.com ©2012 Powercast Corporation 10
  11. 11. Wide Input Power Range for Short & Long Distance 80 P1110 - 915MHz, 3VRF-to-DC Conversion Efficiency (%) 70 P2110 - 915MHz, 1.05V Power 60 50 40 30 20 10 Distance 0 Anticipated RFID range -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 11
  12. 12. Harvested Power @ 915MHz 60 P1110 - 915MHz, 3V 50Harvested Power (mW) 40 30 20 Anticipated RFID range 10 0 P2110 - 915MHz, 1.05V -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 12
  13. 13. Harvested Power @ 915MHz 1 P1110 - 915MHz, 3V 0.8Harvested Power (mW) 0.6 0.4 0.2 P2110 - 915MHz, 1.05V 0 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 13
  14. 14. P1110/P2110 Hybrid for RFID Charge Time for Sustained 3V Regulated Output 16 14 12 Charge Time (sec) 10 8 0dBi Rx antenna @ 2m 6 0.35mW 1dBi Rx antenna @ 1m 4 2 1.8mW 0 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 Input Power (dBm)Charge time based on 4W RFID reader charging 1000uF capacitor www.powercastco.com ©2012 Powercast Corporation 14
  15. 15. Passive Wireless Sensor Tag Demo P2110 RF Powerharvester Radio moduleSuperCap Microcontroller Sensors Temp/Humidity/Light www.powercastco.com ©2012 Powercast Corporation 15
  16. 16. Productized PWST Operated at 80 feet from 3W Tx withOmni-Directional 6dBi directional RxRx antenna antenna(WSN-1002) (WSN-1001) www.powercastco.com ©2012 Powercast Corporation 16
  17. 17. Sensor Tag Development ToolCredit card Programmingform factor interface Charging Silicon Labs capacitor Wireless MCU 915MHzRF Powerharvester Data Antenna 915MHz Power Antenna www.powercastco.com ©2012 Powercast Corporation 17
  18. 18. 915MHz(ft.) vs. AverageSensor Tag Distance (UHF) Current Delivered (uA) 10000 Charge Current @ 4.0V 1000Average Current (uA) 100 Average current (uA) 4.0 10 1 2uA @ 15 feet from 3W Tx 0.1 0 2 4 6 8 10 12 14 16 18 Distance (ft) Distance (ft.) www.powercastco.com ©2012 Powercast Corporation 18
  19. 19. 13.56MHz (HF RFID) – Efficiency 45 1.2V 40 35 30Efficiency (%) 1V 2V 25 20 >25% Conversion Efficiency for harvested power before voltage boost 15 10 Based on preliminary designs 5 using P2110 circuit architecture 0 -10 -5 0 5 10 15 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 19
  20. 20. 13.56MHz (HF RFID) – Harvested Power 7 Preliminary designs support charging 2V 6 range of inches to several feetHarvested Power (mW) 5 1.2V 4 1V 3 2 1 0 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 20
  21. 21. Summary• Great opportunities for high-function RFID• RF power harvesting is a key enabler• Core RF circuit design can support HF and UHF www.powercastco.com ©2012 Powercast Corporation 21
  22. 22. Powercast Resrouces• Documentation – http://www.powercastco.com/resources/• Wireless power calculator (Excel) – http://www.powercastco.com/power-calculator/• Videos and Presentations – http://www.youtube.com/powercastco – http://www.slideshare.net/powercastEmerging P2100 TX91501 P2110 P2110Technology Powerharvester® Powercaster® Powerharvester® Powerharvester® www.powercastco.com ©2012 Powercast Corporation 22

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