2001 Sep 24

2

Philips Semiconductors

Product specification

HITAG 1 stick transponder

HT1DC20S30

FEATURES

• Complete identification transponder for use in

contactless applications

• Operating frequency 125 kHz

• Data transmission and supply energy via RF link, no

internal battery

• Low power EEPROM technology for writing distance

that equals reading distance

• Total memory size 2048 bits

• Parts of memory can be write protected by the user

• Effective communication protocol with outstanding data

integrity check

• Secure mutual authentication function

• Encrypted data transmission

• Anticollision protocol for handling of multiple

transponders inside the field of the reader antenna

• Special features:

– User defined write protection

– Unique 32-bit serial number for each transponder

– Encrypted data transmission possible.

GENERAL DESCRIPTION

the HITAG tag IC, is a high performance transponder for

bi-directional data transmission in full-duplex mode. Data

is stored in the transponder in a non-volatile memory

(EEPROM).

The transponder acts as a passive device, thus not having

the need for any internal power supply (battery).

It derives power from the magnetic component of the

RF resonant frequency generated by the reader. Data is

transmitted by modulating this resonant frequency.

The HT1DC20S30 is dedicated for use in secure access

systems where the transponder and the reader have to

identify each other.

The EEPROM has a capacity of 2048 bits and is

organised in 64 pages. Access is provided either in page

mode or in block mode, where 1 block includes 4 pages.

Data transmission from the HT1DC20S30 to the reader

uses Manchester or biphase coding and Amplitude Shift

Keying (ASK) modulation. Absorption modulation is used

to transmit data from the transponder to the reader. The

transponder absorbs the magnetic field which hence

modulates the current in the reader antenna.

Data transmission from the reader to the HT1DC20S30

uses Binary Pulse Length Modulation (BPLM).

The anticollision feature of the transponder allows to

operate several transponders simultaneously in the field of

the reader antenna. To use that feature, the reader needs

to have implemented the anticollision protocol and must be

able to detect bit-collisions (e.g. the Philips HTRM800 long

range reader module includes the anticollision protocol.

(1) HITAG - is a trademark of Philips Semiconductors

Gratkorn GmbH.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

resonant frequency

120

125

130

kHz

data transfer rate

transponder to reader

−

4.0

−

kbits/s

reader to transponder

−

5.2

−

kbits/s

M

memory

size

−

2048

−

bits

organization

−

64

−

pages

N

encrypted mutual authentication bits

serial number

−

32

−

bits

secret key

−

32

−

bits