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Understanding NFC Technology: Key Components, Applications, and Benefits

This discussion explores Near Field Communication (NFC) technology, which enables contactless communication between devices such as smartphones and tablets. The NFC Forum promotes its use in consumer electronics and mobile devices. The technology, derived from RFID, operates at 13.56 MHz and has key applications in access control, ticketing, and contactless payments. We review its advantages, including lower power consumption and ease of setup, compared to Bluetooth. However, NFC faces challenges like security concerns and limited data transfer rates.

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Understanding NFC Technology: Key Components, Applications, and Benefits

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  1. Week #6: Discussion results NFC technology and its components Group #33 Group member: TianhaoHan Ximeng Sun(Susie) Xing Cao(Star) Zhuoran Yang

  2. NFC(Near field communication) Definition: Near field communication, abbreviated NFC, is a form of contactless communication between devices like smartphones or tablets. The Near Field Communication (NFC) Forum is a non-profit industry association that promotes the use of NFC short-range wireless interaction in consumer electronics, mobile devices and PCs.

  3. What is NFC ? • NFC comes from RFID(Radio Frequency IDentification) • NFC have three standard: FeliCaTM(SONY) ISO14443A, B(Philips) Type A, Type B, Type F • NFC is a set of short-range wireless technologies • Operates at 13.56MHz on ISO/IEC 18000-3 air interface and at rates ranging from 106Kbit/s to 424Kbits/s • Theoretical working distance with compact standard antennas: up to 20 cm (practical working distance of about 4 centimeters)

  4. How does it work ? • Involves an initiator and a target • Initiator actively generates an RF field that can power a passive target • Passive communication mode • Active communication mode

  5. Application: • Access Control: Replacing traditional keys for either physical access (hotel room) or control (starting a car) • Ticketing: Replacing paper tickets for social events and public transportation • Contactless Payments: Mobile payments debited from financial or MNO linked accounts • Interactive World: Marketing and exchange of information such as schedules, maps, business card and coupon delivery using NFC Marketing tags • Media Sharing: Transfer images, videos, music between mobile phones • Social media e.g. "Like" on Facebook, "Follow" on Twitter via NFC smart stickers in retail stores

  6. Weakness • Security • Bit rate is low(only few information can be past in a short time) • Short distance

  7. Benefits for NFC technology (Comparing with blue tooth) • Smaller power consumption • Simply set up and set-up time is short • Security • Less cost($2-$3 VS $20) • Larger market

  8. Key features and benefits for NFC Controller • Highly integrated transmission modules for contactless communication at 13.56MHz including a microcontroller.

  9. Comparing

  10. Overall • TRF7970A is cheaper and available. • TRF7970A’s documentations including datasheet are public/full and available directly without any registration or NDA. • Support Direct Mode 0 "Raw RF Sub-CarrierData Stream" to encode/decode all 13.56MHz subcarrier data stream. • PN532 has more specific features.

  11. Applications *Mobile Devices (Tablets, Handsets) *Secure Pairing(Paired wireless networks) ---------Bluetooth, WIF *Public Transport or Event Ticketing *Passport or payment (POS) Reader System *Short-Range Wireless Communication Tasks (Firmware Updates) *Product Identification or Authentication *Medical Equipment or Consumables *Access Control, Digital Door Locks *Sharing of Electronic Business Cards

  12. Two Official Suggestion of TRF7970A • Using Parallel Microcontroller Interface • Using SPI With SS Mode

  13. TRF7970A Reader System Using Parallel Microcontroller Interface

  14. Schematic for a parallel MCU interface

  15. General Application Consideration • Due to the low clock frequency on the data_clk (pin 26) line, the parallel interface is the most robust way to connect the TRF7970A with the MCU.

  16. General Application Consideration • Schematic shows matching to a 50 Ωport, which allows connecting to a properly matched 50 Ωantennacircuit or RF measurement equipment For example: a spectrum analyzer or power meter.

  17. TRF7970A Reader System Using SPI With SS Mode

  18. Schematic for SPI with an SS mode MCU interface.

  19. General Application Consideration • Systems using the Serial Port Interface (SPI). Short SPI lines, proper isolation of radio frequency lines, and a proper ground area are essential to avoid interference. • The recommended clock frequency on the data_clk line is 2 MHz.

  20. Structure • There are two parts in NFC technique. a)NFC analog front-end (one case is NFC Controller with antenna). b)Security unit. Depending on the application requirements, it can be SIM, SD, SAM or other chips.

  21. To fulfill NFC technique. Here is the graph:

  22. The block diagram for TRF7970A

  23. Terminal Functions

  24. Question time.

  25. Thank you for your listening!

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