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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: 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 2. Initiator actively generates an RF field that can power a passive target Passive communication mode Active communication mode 1. 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 • 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. Comparing Features TI: TRF7970A NXP: PN532 Cost(break out board) Less than $30(Free sample) $39.95 Total power dissipation 100mW, 200mW 500mW Operating temperature average range -40 centidegree to +110 centidegree -30 to +85 Low power modes Hard-Power-Down mode(Less than1µA) • Hard-Power-Down mode(1µA typical) • Soft-Power-Down mode(22µA typical) Decoder & Encoder Integrated encoders, decoders Integrated demodulators, decoders 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 SubCarrierData 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 Schematic for a parallel MCU 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 Ω port, which allows connecting to a properly matched 50 Ω antenna circuit or RF measurement equipment For example: a spectrum analyzer or power meter. TRF7970A Reader System Using SPI With SS Mode Schematic for SPI with an SS mode MCU interface. 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. To fulfill NFC technique. Here is the graph: The block diagram for TRF7970A Terminal Functions Question time. Thank you for your listening!