Rfid interface with lpc2148

1. Wireless Communication-
RFID
M.Tech (EE) Group-7 Presentation
Ritesh Kumar

2. 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

3. RFID System Components
• RFID Tag
• Transponder
• Located on the object
• RFID Reader
• Transceiver
• Can read and write data to Tag
• Data Processing Subsystem

4. 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

5. 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

6. 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

7. Content

8. Specifications

10. A typical Tag Reader board

11. P0.3
*P0.2
AD0.5
GND
Vcc
GND
VIN
CANL
CANH
P0.0-TxD0
P0.1-RxD0
AD0.0 AD0.1 AD0.2 AD0.3
XTAL1
62
XTAL2
61
P0.0/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
V3
23
RST
57
VREF
63
VSS
6
VSSA
59
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
V3
43
V3
51
VSS
18
VSS
25
VSS
42
VSS
50
RTXC1
3
RTXC2
5
V3A
7
VBAT
49
P0.31
17
P0.26/AD0.5
10
U1
LPC2138
ARM7 Microcontroller (Note- CAN model not available
in library)
FUELCELL1
1.5V
Represented by
1.5V Cell
FUELCELL0
1.5V
Represented
by 1.5V cell
R3
10k
Voltage Divider
R7
10k
GND
C1
1nF
LPF
RO
1
DE
3
DI
4
A
6
B
7
RE
2
U2
TJA1051- CAN TxRx
R2
10k
Voltage Divider
R4
10k
GND
C2
1nF
LPF
FUELCELL3
1.5V
Represented by
1.5V Cell
FUELCELL2
1.5V
Represented by
1.5V cell
R1
10k
Voltage Divider
R5
10k
GND
C3
1nF
LPF
R6
10k
Voltage Divider
R8
10k
GND
C4
1nF
LPF
GND
27.0
3
1
VOUT
2
U3
LM35
Fuel Cell Temp Monitor
C5
1nF
Filter
GND
1
2
J1
CONN-H2
PowerSupplyJack 12
X1
CRYSTAL
Quartz
C6
22pF
Crystal Load Cap
C7
22pF
Crystal Load Cap
GND
R10
10k
Reset Pull up
C8
10nF
Debouncing
Cap
GND
SW1
SW-SPSTReset Switch
L1Ferrite Bead 600R@100MHz
Noise reduction in Analog GND
C9
1nF
Decoupling Cap / powerpin
C10
1nF
C11
1nF
C12
1nF
C13
1nF
Decoupling
GND
VI
2
VO
3
GND
1
U4
79L05
LinearRegulatorD1
MZP4764A
Reverse Polarity Protection
C14
10nF
ESD Protection C15
10u
Buffer Cap
C16
220nF
Output Stability Cap
Vcc
Vcc
1
6
2
7
3
8
4
9
5
J2
CONN-D9M
CAN CONN
Vcc
GND
Vcc
Xmodem, Ymodem, Zmodem
VT52, VT100, ANSI
RXD
RTS
TXD
CTS
HYPERTERMINAL
50%
RV3
1k
FuelCell1
71%
RV1
1k
FuelCell0
50%
RV2
1k
FuelCell2
50%
RV4
1k
FuelCell3
Vcc
GND
Actual AD0.0
Actual-AD0.1
Actual AD0.2
Actual AD0.3
AD0.0
AD0.1
AD0.2
AD0.3
System Schematic (tbc)

12. System Level Communication

13. System Components