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TK5530

Read-only Transponder

Atmel Corporation 

General

Read-Only IDICÒ

with ROM (e5530)

The transponder consists of a plastic cube which accommodates following components:

• Read-only IDICÒ with ROM (e5530)

• Antenna realized as tuned LC-circuit

The e5530 is part of a closed coupled identification system (see ’System Block Dia-

gram’). It receives power from a RF transmitter (reader) which is coupled inductively to

the IDIC. The TK5530 transponder operates at a nominal frequency of 125 kHz. Receiv-

ing RF, the IDIC responds with a data stream by damping the incoming RF via an

internal load. This damping in turn can be detected by the reader. The identifying data

are stored in a 128-bit PROM on the e5530, which is factory programmed with a unique

code (see specification of the e5530).

The e5530 has several possible options regarding modulation, bitrate, memory size etc.

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 for improving the readout distance.

Figure 1. Block Diagram

Analog front end

Mod

Load

Coil

Modulator

FSK

PSK

BIPH

Manchester

Clock

Clk

extractor

Data

R7

R6

R5

R4

R3

R2

R1

R0

128 bit PROM

Coil

Rectifier

VDD

VSS

Bitrate

Column decoder

Counter

2 TK5530

4683A–RFID–02/03

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