1
Features
·
65 ms Cycle Time for Crypto Algorithm Programming
·
Encryption Time < 10 ms, < 30 ms Optional
·
Identification Transponder in Plastic Cube
·
Contactless Read/Write Data Transmission
·
High-security Crypto Algorithm Optional
·
Inductive Coupled Power Supply at 125 kHz
·
Basic Component R/W e5561 IDIC
â
·
Built-in Coil and Capacitor for Circuit Antenna
·
Starts with Cyclical Data Read Out
·
Self-adapting Resonance Frequency (Optional)
·
128-bit User-programmable EEPROM
·
Typical < 50 ms to Write and Verify a Block
·
Read/Write Protection by Lock Bits
·
Options Set by EEPROM:
Bit Rate (Bit/s): Rf/32, Rf/64
Modulaton: Manchester, Biphase
Application
·
Car Immobilizers with Higher Security Level
·
High-security Identification Systems
Description
The TK5561A-PP is a complete transponder integrating all important functions for
immobilizer and identification systems. It consists of a plastic cube which accommo-
dates the crypto IDIC e5561A and the antenna realized as tuned LC-circuit. The
TK5561A-PP is a R/W crypto transponder for applications which demand higher secu-
rity levels than those which standard R/W transponders can fulfil. For this reason, the
TK5561A-PP has an additional encryption algorithm block which enables a base sta-
tion to authenticate the transponder. Any attempt to fake the base station with a wrong
transponder will be recognized immediately. For authentication, the base station trans-
mits a challenge to the TK5561A-PP. This challenge is encrypted by both the IC and
the base station. Both should possess the same secret key. Only then can the results
be expected to be equal.
For detailed technical information about functions, configurations etc., please refer to
the e5561 data sheet.
Read/Write
Crypto
Transponder for
Short Cycle
Time
TK5561A-PP
Rev. 4682ARFID02/03
2
TK5561A-PP
4682ARFID02/03
Figure 1. Transponder and Base Station
Figure 2. Block Diagram
e5561A
Transponder TK5561A-PP
RF field
Response
Power
ID
Challenge
(e5561A + coil + C in plastic cube)
Base station
U2270B read/write IC
MARC4 series
m
c
Coil
C
Coil 1
Coil 2
MODULATOR
A
N
A
L
O
G
F
R
O
N
T
E
N
D
INPUT REGISTER
W
R
I
T
E
D
E
C
O
D
E
R
B
I
T
R
A
T
E
G
E
N
E
R
A
T
O
R
64 or 128 bit ID code
CONTROLLER
TESTLOGIC
MODE REGISTER
H
V
G
E
N
E
R
A
T
O
R
CRYPTO CIRCUIT
POR
Test pads
crypto control
OP-code detect
EEPROM control
read/write control
crypto key
A
D
A
P
T
V
SS
Memory
(320 bit EEPROM)
V
DD
3
TK5561A-PP
4682ARFID02/03
General
The transponder is the mobile part of the closed coupled identification system (see Fig-
ure 1), whereas the read/write base station is based on the U2270B or on discrete
solutions, and the read/write transponder is based on the e5561A IDIC.
The transponder is a plastic-cube device consisting of the following parts:
·
The transponder antenna, with a tuned LC-circuit
·
Read/write IDIC
(e5561A) with EEPROM
Transponder Antenna
The antenna consists of a coil and a capacitor for tuning the circuit to the nominal carrier
frequency of 125 kHz. The coil has a ferrite core to improve the read, write and program-
ming operation distances.
Read/Write Crypto
Identification
The e5561A is a member of the Atmel's contactless IDentification IC (IDIC) family,
which are used in applications where information has to be transmitted without contacts.
The IDIC is connected to a tuned LC circuit for power supply and bidirectional data com-
munication (Read/Write) to a base station.
The on-chip non-volatile memory of the 320-bit EEPROM (10 blocks, 32 bits each) can
be read and written blockwise by a read/write base station, e.g. based on the U2270B.
Up to four blocks consisting of the user programmable ID code, the crypto key and con-
figurations are stored in six blocks. The crypto key and the ID code can be individually
protected against overwriting.
The typical operational frequency of the TK5561A-PP is 125 kHz. Two data bit rates are
programmable: Rf/32 and Rf/64. During the reading operation the incoming RF field is
dampened bit-wise by an on-chip load. This AM-modulation is detected by the field gen-
erating base station unit. Data transmission starts after power-up with the transmission
of the ID code and continues as long as the TK5561A-PP is powered.
Writing is carried out by means of Atmel's patented writing method. To transmit data to
the TK5561A-PP the read/write base station has to interrupt the RF field for a short time
to create a field gap. The information is encoded in the number of clock cycles between
two subsequent gaps.
See the e5561A data sheet for detailed information of the IDIC.
4
TK5561A-PP
4682ARFID02/03
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
Operating temperature range
T
amb
-40 to +85
°
C
Storage temperature range
T
stg
-40 to +125
°
C
Maximum assembly temperature, t < 5 min
T
ass
170
°
C
Magnetic field strength at 125 kHz
H
pp
1000
A/m
Operating Characteristics Transponder
T
amb
= 25°C, f = 125 kHz unless otherwise specified
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Inductance
L
4.2
mH
LC circuit, H
pp
= 20 A/m
Resonance frequency
T
amb
= -40 to +85°C
f
r
121
125
129
kHz
Quality factor
Q
LC
5
8
11
Magnetic Field Strength (H)
Max. field strength where
transponder does not modulate
No influence to other transponders
in the field
H
pp not
5
A/m
Minimum Field Strength (H)
Read mode
T
amb
= -40
°
C
H
pp -40
24
A/m
T
amb
= 25
°
C
H
pp 25
18
A/m
T
amb
= 85
°
C
H
pp 85
15
A/m
Programming mode
T
amb
= -40
°
C
H
pp -40
30
A/m
T
amb
= 25
°
C
H
pp 25
35
A/m
T
amb
= 85
°
C
H
pp 85
40
A/m
Lowest adapt frequency
f
LA
118
121
124.5
kHz
Highest adapt frequency
f
HA
125
128
131.5
kHz
Data retention EEPROM
T = 25
°
C
t
retention
10
Years
Programming cycles EEPROM
100,000
Programming time/block
RF = 125 kHz
t
p
16
ms
Maximum field strength
H
pp max
600
A/m
5
TK5561A-PP
4682ARFID02/03
Figure 3. Typical Curve for Degree of Modulation
Figure 4. Measurement of the Degree of Modulation
0.0
0.1
0.2
0.3
0.4
0.5
0
20
40
60
80
100
120
H
pp
(A/m)
DV (V)
V2
V1
m
V1
V2
V1
V2
+
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