Wireless Communication- RFID

M.Tech (EE) Group-7 PresentationRitesh Kumar

RFID- Introduction• Radio Frequency Identification has found multiple applications right from

Automatic Traffic Toll collection to Automated billing in Supermarkets. • Typical applications can be categorized as-

• Access control and security• Tracking of products in Supply Chain• IDs of products at Point of Sale

• Typical components of an RFID system include- • Active or Passive Tag• Tag reader• Communication unit

• The frequency of operation usually falls in ISM band at 125 KHz, 13.56 MHz, 915 MHz or 2.4 GHz

RFID System Components• RFID Tag

• Transponder• Located on the object

• RFID Reader• Transceiver• Can read and write data to Tag

• Data Processing Subsystem

Transponder• Consist of microchip that stores data and antenna• Active transponders have on-tag battery• Passive transponders obtain all power from the interrogation signal of

reader• Active and passive only communicate when interrogate by transceiver

Transceiver• Consist of a RF module, a control unit, and a coupling element to

interrogate tags via RF communication• Also have secondary interface to communicate with backend systems• Reads tags located in hostile environment and are obscured from

view

Modulation• RF communications typically modulate high frequency carrier signal to

transmit baseband code• Three classes of digital modulation are ASK, FSK, and PSK.• ASK most common in 13.56 MHz load modulation• PSK most common in 915 MHz backscatter modulation

Content

Specifications

A typical Tag Reader board

P0.3

*P0.2

AD0.5

GND

VccGND

VIN

CANL

CANH

P0.0-TxD0

P0.1-RxD0

AD0.0 AD0.1 AD0.2 AD0.3

XTAL162

XTAL261P0.0/TxD0/PWM1 19

P0.1/RxD0/PWM3/EINT0 21

P0.2/SCL0/CAP0.0 22

P0.3/SDA0/MAT0..0/EINT1 26

P0.4/SCK0/CAP0.1/AD0.6 27

P0.5/MISO0/MAT0.1/AD0.7 29

P0.6/MOSI0/CAP0.2/AD1.0 30

P0.7/SSEL0/PWM2/EINT2 31

P0.8/TxD1/PWM4/AD1.1 33

P0.9/RxD1/PWM6/EINT3 34

P0.10/RTS1/CAP1.0/AD1.2 35

P0.11/CTS1/CAP1.1/SCL1 37

P0.12/DSR1/MAT1.0/AD1.3 38

P0.13/DTR1/MAT1.1/AD1.4 39

P0.14/DCD1/EINT1/SDA1 41

P0.15/RI1/EINT2/AD1.5 45

P0.16/EINT0/MAT0.2/CAP0.2 46

P0.17/CAP1.2/SCK1/MAT1.2 47

P0.18/CAP1.3/MISO1/MAT1.3 53

P0.19/MAT1.2/MOSI1/CAP1.2 54

P0.20/MAT1.3/SSEL1/EINT3 55

P0.21/PWM5/AD1.6/CAP1.3 1

P0.22/AD1.7/CAP0.0/MAT0.0 2

P0.23 58

P0.25/AD0.4/AOUT 9

P0.27/AD0.0/CAP0.1/MAT0.1 11

P0.28/AD0.1/CAP0.2/MAT0.2 13

P0.29/AD0.2/CAP0.3/MAT0.3 14

P0.30/AD0.3/EINT3/CAP0.0 15

V323

RST57

VREF63

VSS6

VSSA59

P1.16/TRACEPKT0 16

P1.17/TRACEPKT1 12

P1.18/TRACEPKT2 8

P1.19/TRACEPKT3 4

P1.20/TRACESYNC 48

P1.21/PIPESTAT0 44

P1.22/PIPESTAT1 40

P1.23/PIPESTAT2 36

P1.24/TRACECLK 32

P1.25/EXTIN0 28

P1.26/RTCK 24

P1.27/TDO 64

P1.28/TDI 60

P1.29/TCK 56

P1.30/TMS 52

P1.31/TRST 20

V343V351

VSS18 VSS25 VSS42VSS50

RTXC13

RTXC25

V3A7

VBAT49

P0.31 17

P0.26/AD0.5 10

U1

LPC2138ARM7 Microcontroller (Note- CAN model not availablein library)

FUELCELL11.5VRepresented by1.5V Cell

FUELCELL01.5VRepresented by 1.5V cell

R3

10kVoltage DividerR710k

GND

C11nFLPF

RO1

DE3

DI4 A 6

B 7

RE2

U2

TJA1051- CAN TxRx

R210k

Voltage DividerR410k

GND

C21nFLPF

FUELCELL31.5VRepresented by1.5V Cell

FUELCELL21.5VRepresented by1.5V cell

R110k

Voltage DividerR510k

GND

C31nFLPF

R610k

Voltage DividerR810k

GND

C41nFLPF

GND

27.0

3

1

VOUT2

U3LM35

Fuel Cell Temp Monitor

C51nFFilter

GND

12

J1

CONN-H2Power Supply Jack

12

X1CRYSTALQuartz

C6

22pF

Crystal Load Cap

C7

22pFCrystal Load Cap

GND

R1010kReset Pull up

C810nF

Debouncing Cap

GND

SW1SW-SPSTReset Switch

L1Ferrite Bead 600R@100MHz

Noise reduction in Analog GND

C91nF

Decoupling Cap / powerpinC101nF

C111nF

C121nF

C131nFDecoupling

GND

VI2 VO 3G

ND

1

U479L05Linear RegulatorD1

MZP4764A

Reverse Polarity Protection

C1410nF

ESD Protection C1510uBuffer Cap

C16

220nFOutput Stability Cap

Vcc

Vcc

162738495

J2

CONN-D9MCAN CONN

Vcc

GND

Vcc

Xmodem, Ymodem, Zmodem

VT52, VT100, ANSIRXD

RTS

TXD

CTS

HYPERTERMINAL

50%

RV31k

FuelCell1

71%

RV11k

FuelCell0

50%

RV21k

FuelCell2

50%

RV41k

FuelCell3

Vcc

GND

Actual AD0.0

Actual-AD0.1

Actual AD0.2

Actual AD0.3

AD0.0AD0.1AD0.2AD0.3

System Schematic (tbc)

System Level Communication

System Components