Week #6: Discussion results

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

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 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.

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.

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.

To fulfill NFC technique. Here is the graph:

The block diagram for TRF7970A

Terminal Functions

Question time.

Thank you for your listening!