10

TK5552

4698A–RFID–04/03

Transponder IC Read/Write Identification IC with 1k-bit Memory

Features

´ 32 Bits) of User Memory

– Modulation Type: PSK/Manchester

– Bit Rate [Bit/s]: RF/16 / RF/32

– Number of Readable Blocks

– Modulation Defeat

– POR Start-up Delay:

» 1 ms / » 65 ms

Functional Description

The transponder IC is a two-terminal, contactless R/W-IDentification IC (IDIC) for tag

applications in the 125 kHz (±25 kHz) range. The IC uses the external RF signal to gen-

erate its own power supply and internal clock reference.

The IC contains a total of 1056 bits of EEPROM memory grouped into 32 individually

addressable data blocks. Each block is made up of 32 bits of data plus an associated

lock bit for block write protection. Blocks 1 to 31 are provided for user related data and

block 0 for system configuration.

Data is transmitted from the IC (uplink) using reflective load (back scatter) modulation.

This is achieved by damping the external RF field by switching a resistive load between

the two terminals Clock-A/Clock-B. The IC receives and decodes amplitude modulated-

data from the base station.

As soon as the tag including the transponder IC is exposed to an RF field (providing that

the field is strong enough to derive enough energy to operate), the tag will respond by

continuously transmitting stored data (uplink mode). The base station can, at any time,

switch the tag to downlink mode to write new user or configuration data. Generally, the

tag will automatically return to the default uplink mode when the downlink transfer is

completed, interrupted or an error condition occurs.

Figure 13. Transponder System Example Using Transponder IC

Memory

Transponder

Base station

Data

Power

Data

downlink

uplink

Transponder IC

Memory

Transponder

Base station

Power