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Week #6: Discussion resultsNFC technology and its components
Group #33Group member:
Tianhao HanXimeng 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 FNFC is a set of short-range wireless technologiesOperates 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 ?
1. Involves an initiator and a target2. Initiator actively generates an
RF field that can power a passive target
Passive communication modeActive 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
• Security
• Bit rate is low(only few information can be past in a short time)
• Short distance
Weakness
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.
ComparingFeatures 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
OverallTRF7970A 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
General Application ConsiderationDue 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 ConsiderationSchematic 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.
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.
StructureThere 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.
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