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Week #6: Discussion results. NFC technology and its components. Group #33 Group member: Tianhao Han Ximeng Sun(Susie) Xing Cao(Star) Zhuoran Yang. NFC( Near field communication ). Definition:
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Week #6: Discussion results NFC technology and its components Group #33 Group member: TianhaoHan Ximeng Sun(Susie) Xing Cao(Star) Zhuoran Yang
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.
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)
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
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
Weakness • Security • Bit rate is low(only few information can be past in a short time) • Short distance
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
Key features and benefits for NFC Controller • Highly integrated transmission modules for contactless communication at 13.56MHz including a microcontroller.
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.
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
Two Official Suggestion of TRF7970A • Using Parallel Microcontroller Interface • Using SPI With SS Mode
TRF7970A Reader System Using Parallel Microcontroller Interface
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.
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.
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.
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.