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1.4

Functional Description

1.5

Memory Organization

Userdata

(256bits)

UIDNumber

(64bits)

X

AFI

0x06

0x08

0x09

0x0A

Block Addr

0x00

0x01

0x02

32bits

FU

F =FactoryLock, U =UserLock

LockBits

0x03

0x04

0x05

0x06

0x07

Functional Description

The Tag-it HF-I Standard Transponder IC is a low power, full duplex Transponder IC for use with passive

contactless identification transponder systems.

The transponder IC is designed to operate with a 13.56 MHz carrier frequency. The ISO standard defines

for some communication parameters several modes in order to meet different international radio

regulations and different application requirements. Therefore communication between the reader and the

transponder (Down-Link communication) takes place using ASK modulation index between 10% and 30%

or 100% and datacoding (pulse position modulation) ‘1 out of 4’ or ‘1 out of 256’.

According to ISO 15693 Up-Link communication (Transponder to Reader) can be accomplished with one

subcarrier (ASK modulation) or with two subcarrier (FSK modulation). Both modes (ASK and FSK) can

operate with either high or low data rate. The transponder will answer in the mode it was interrogated

from the reader and supports all communication parameter combinations. Up- and Down-Link are

frame synchronized and CRC check sum secured.

Each Tag-it HF-I Standard Transponder IC has a ‘unique’ address (UID) stored in two blocks which are

factory-programmed and 64 bits long (=264 different addresses). This can be used for addressing each

transponder uniquely and individually for a one-to-one exchange between the reader and the transponder.

A mechanism to resolve collisions of a multiplicity of transponders (Anticollision) is also implemented. This

special feature allows multiple transponders to be read simultaneously and offers the capability to

inventory in a very short time a large number of transponders by their unique address, provided they are

within the reader operating range.

Also, the Application Family Identifier (AFI), which is optional in the ISO15693, is supported by the Tag-it

HF-I Standard Transponder.

For more details about the communication between reader and transponder see ISO/IEC 15693 and the

Tag-it HF-I Standard Extended Command Specification.

User data is read and stored in a 256 bit non-volatile user memory that is organized in 8 blocks. Each

block with 32 bit is user programmable and can be locked individually to protect data from modification.

Once set, the lock bit cannot be reset. The user memory is field programmable per block. Two levels of

block locking are supported: Individual block locking by the user (U) or individual block locking of factory

programmed data (F) during manufacturing. Bit 2 of the “Block Security Status” Byte defined in ISO

15693-3 is used to store the Factory Lock Status of the Block. Block locking irreversibly protects the

locked data from any further reprogramming.

Figure 1-2. Memory Organization of the Tag-it HF-I Standard Transponder IC

SCBU047 (11-09-21-064) – October 2007

Introduction

9

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