TK5552 ATMEL Corporation, TK5552 Datasheet - Page 2

• Manufacturer Part Number: TK5552
• Description: Read/Write Transponder
• Manufacturer: ATMEL Corporation

Figure 1. Transponder and Base Station
General
Transponder Antenna
Read/Write IDIC
2
TK5552
Base station
(1)
The transponder is the mobile part of a closed coupled identification system (see Figure
1), where the read/write base station incorporates a reader IC such as the U2270B, and
the read/write transponder is based on the transponder IDIC.
The transponder is a plastic cube device consisting of the following parts:
•
•
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 distance of read (uplink)
and write (downlink) operations.
The read/write Transponder IDIC is part of the transponder TK5552. The data is trans-
mitted bi-directionally between the base station and the transponder. The transponder
receives power via a single coil from the RF signal generated by the base station. The
single coil is connected to the chip and also serves as the IC's bi-directional communica-
tion interface.
Data transmission is done by modulating the amplitude of the RF signal. Reading
(uplink) occurs by damping the coil by an internal load. Writing (downlink) occurs by
interrupting the RF field in a specific way. The TK5552 transponder operates at a nomi-
nal frequency of 125 kHz. Different bit rates and encoding schemes are available.
The on-chip 1056-bit EEPROM (32 block, 33 bits each) can be read (uplink) and written
(downlink) blockwise from the base station. The blocks can be protected against over-
writing by using lock bits. One block is reserved for setting the operation modes of the
IC.
See section “Transponder IC Read/Write Identification IC with 1k-bit Memory”.
The transponder antenna, realized as a tuned LC circuit
The read/write IDIC (transponder IC) with EEPROM
RF field
Power
Data
(1) For a short distance U2270B read/write IC with MARC4 (see Figure 12)
Transponder IC
Transponder IC + coil + C in plastic cube
Coil
Transponder TK5552
C
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4698A–RFID–04/03