Philips 2dc20 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

HT2 DC20 S20

HITAG

Product specification
Revision 2.0

TM

2 Transponders

March 1998

Philips Semiconductors Product specification Revision 2.0

HITAGTM2 Transponders

CONTENTS

1 FEATURES
2 GENERAL DESCRIPTION
3 ORDERING INFORMATION
4 QUICK REFERENCE DATA
5 BLOCK DIAGRAM
6 GENERAL FUNCTIONAL DESCRIPTION

6.1 Memory Organization

6.2 Operation Modes and Configuration

6.2.1 Modes of Operation

6.2.2 Status Flow

6.2.3 Configuration

6.3 Configuration of Delivered Transponders

6.4 Definition of Passwords and Keys
7 LIMITING VALUES
8 ELECTRICAL CHARACTERISTICS
9 MECHANICAL CHARACTERISTICS
10 DEFINITIONS
11 LIFE SUPPORT APPLICATIONS

HT2 DC20 S20

March 1998 2

Philips Semiconductors Product specification Revision 2.0

HITAGTM2 Transponders

1 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/secret memory) organized in
8 pages, 4 bytes each

• 10 years non-volatile data retention

• >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

(MIRO and transponders from µEM (H400x))

– Public Mode B

(according to ISO 11784 and ISO 11785 for animal
identification)

– Public Mode C (PIT compatible mode)

HT2 DC20 S20

2 GENERAL DESCRIPTION

The HT2DC20S20 is a high performance transponder for
bi-directional transmission in half duplex mode between
read/write device and transponder.

Data are 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 are 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, standard read only modes) the
versatile transponder can be used in various applications.
The possible use of an installed reader base for read only
transponders makes the additional use of HT2DC20S20 or
the replacement of read only transponders by
HT2DC20S20 very easy.

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/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 or write access by setting corresponding
memory flags.

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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 to the HT2DC20S20
uses binary pulse length modulation (BPLM).

Philips Semiconductors Product specification Revision 2.0

HITAGTM2 Transponders

3 ORDERING INFORMATION

EXTENDED TYPE NUMBER IC VERSION PACKAGE DRAWING

HT2 DC20 S20/F VLOCS1 V0 SOT385-1 SOT385BA3 −40 to +85

4 QUICK REFERENCE DATA

PARAMETER VALUE UNIT

Carrier frequency 125 kHz (typical)
Data transmission mode half-duplex
Transfer rate

• transponder -> reader

• reader -> transponder

Coding

• transponder -> reader

• reader -> transponder

Modulation ASK (amplitude shift keying)
Memory size 256 byte
Memory organization 8 (blocks) page (each 16 byte)
Encrypted mutual authentication

• Serial Number

• Secret Key

• Duration

4.0

5.2

Manchester / Biphase
BPLM (binary pulse length modulation)

32
48
36

kbit/s
kbit/s

bit
bit
ms

HT2 DC20 S20

TEMPERATURE

RANGE (°C)

Special features • user defined write protection

• unique 32 bit serial number for each transponder

• read only emulation function
(µEM H400x family, ISO 11784 and 11785, PIT compatibility)

• encrypted data transmission possible

March 1998 4

Philips Semiconductors Product specification Revision 2.0

HITAGTM2 Transponders

5 BLOCK DIAGRAM

CONTACTLESS INTERFACE

HT2 DC20 S20

RECTIFIER

VOLTAGE LIMITER

POWER-ON

RESET

HT2 DC20 S20

CONTROL LOGIC

DATA

ACQUISITION

EEPROM

ACCESS CONTROL

CLOCK

RECOVERY

L

C

MODULAT OR

DEMODULAT OR

TRANSPONDER IC

CALCULATION UNIT

EEPROM

Fig.1 Blockdiagram transponder.

March 1998 5