HT2DC20S20 datasheet(2/16 Pages) NXP

2 / 16 page

2001 Oct 01

Philips Semiconductors

Product speciﬁcation

HITAG 2 stick transponder

HT2DC20S20

FEATURES

• Identification transponder for use in contactless

applications

• Operating frequency 125 kHz

• Data transmission and supply energy via RF link,

no internal battery

• Reading distance same as writing distance

• Non-volatile memory of 256 bits (128 bits user data,

128 bits control data and secret memory) organized in

8 pages, 4 bytes each

• Ten years non-volatile data retention

• More than 100000 erase/write cycles

• Selective read/write protection of memory content

• Two coding schemes for read operation: biphase and

Manchester coding

• Effective communication protocol with outstanding data

integrity check

• Mutual authentication function

• Read/write mode allows:

– Plain data transmission (password check)

– Encrypted data transmission (crypto mode).

• In read/write mode multi-tag operation possible because

of special HALT function

• Emulation of standard industrial read-only transponders:

– Public mode A (64 bits read-only)

– Public mode B (according to ISO 11785 for animal

identification)

– Public mode C (PIT compatible mode).

• Special features:

– User defined write protection

– Unique 32-bit serial number for each transponder

– Read-only emulation function

– Encrypted data transmission possible.

GENERAL DESCRIPTION

The HITAG(1) stick transponder HT2DC20S20 is a high

performance transponder for bi-directional transmission in

full-duplex between the read and write device and the

transponder.

Data is stored in the transponder in a non-volatile memory

(EEPROM).

The transponder requires no internal power supply; it

derives its power from the magnetic component of the

RF carrier frequency generated by the reader. Data is

transmitted by modulating this carrier.

The HT2DC20S20 is dedicated for use in secure access

systems where the transponder and the reader have to

identify each other. The choosable use of cryptography

enables highest data security. Providing several operating

modes (password, crypto and standard read-only modes)

the versatile transponder can be used in various

applications.

The HALT command can be used after finishing data

exchange to reach the halt state. In this state the

transponder is muted. This feature can be used to have

steady RF field where single transponders are collected

one by one. Each transponder is operated and then

disabled, so it does not interfere with the next transponder.

The HALT state can only be exited by switching off and

removing the magnetic field.

The EEPROM has a capacity of 256 bits and is organized

in 8 pages of 4 bytes. The 8 pages are split up into

4 pages containing user data and into 4 pages for control

of the memory access and for authentication purposes.

The pages of the transponder memory can be protected

against read and write access by setting corresponding

memory flags.

Data transmission from the HT2DC20S20 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 HT2DC20S20

uses Binary Pulse Length Modulation (BPLM).

(1) HITAG - is a trademark of Philips Semiconductors

Gratkorn GmbH.

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