HT2DC20S20 ,HITAG 2 stick transponderapplications.• Two coding schemes for read operation: biphase andManchester coding The HALT command ..
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HT2DC20S20
HITAG 2 stick transponder
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, 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 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). Inread/write mode multi-tag operation possible because
of special HALT function Emulationof 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 DESCRIPTIONThe HITAG(1) stick transponder HT2DC20S20 is a high
performance transponderfor bi-directional transmissionin
full-duplex between the read and write device and the
transponder.
Datais storedin the transponderina non-volatile memory
(EEPROM).
The transponder requires no internal power supply; it
derives its power from the magnetic component of the 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 itdoes not interferewith the next transponder.
The HALT state can only be exited by switching off and
removing the magnetic field.
The EEPROM hasa capacityof 256 bits andis organized
in 8 pages of 4 bytes. The 8 pages are split up into pages containing user data and into4 pagesfor 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.
Philips Semiconductors Product specification
HIT AG 2 stick transponder HT2DC20S20
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Product specification
HIT AG 2 stick transponder HT2DC20S20
BLOCK DIAGRAM
Philips Semiconductors Product specification
HIT AG 2 stick transponder HT2DC20S20
FUNCTIONAL DESCRIPTION
Memory organizationThe memory of the transponder consists of 256 bits
EEPROM memory andis organizedin8 pages with32 bits
each.
Depending on the operating mode the EEPROM is
organized as described in Table1.
Table 1 Memory organization
Operating modesWith the configuration byte, the operating mode and the
access rights to the memory can be selected.
During power-upof the transponder the configuration byte
is read from the EEPROM of the transponder.
The HT2DC20S20 can operate in several modes: Crypto mode
Mode for writing or reading the transponder with
encrypted data transmission. Password mode
Mode for writing or reading the transponder with plain
data transmission. Public mode A (Manchester)
Read-only mode. The64 bitsof the user pages4 and5
are cyclically transmitted to the read and write device. Public mode B (biphase)
Read-only mode according to ISO standards 11784
and 11785 for animal identification. The 128 bits of the
user pages4to 7 are cyclically transmitted to the read
and write device. Public mode C (biphase)
Read-only mode emulating the read operation of the
PCF793X (with a slightly different program mode
check). In the public mode C the 128 bits of the user
pages4to 7 are cyclically transmitted to the read and
write device.
Philips Semiconductors Product specification
HIT AG 2 stick transponder HT2DC20S20
Status flowAfter entering the RF field the transponder waits for a
command to start the authentication (see Fig.2). After
issuing this command the mutual authentication takes
place, followed by read and write commands. the password mode the data transferoccurs plain andin
the crypto mode data are encrypted.
The halt state can be entered for muting a transponder. the transponderis configuredin one ofthe public modes,
these modes are entered automatically after a certain
waiting time and data pages are sent cyclicallyto the read
and write device. issuing the commandto start the authentication during
the waiting time also public mode transponders can be
brought into the authorized state.
ConfigurationIf you change the configuration (keys or passwords) you
have to place the transponder directly on the antenna
(0-distance)!In orderto avoid any errors,do not move the
transponder during this write process andbe sure that you
are in a safe environment without electrical noise.
The configuration byte is represented by the first 8 bits of
page 3 of the transponder memory (see Table2).
Philips Semiconductors Product specification
HIT AG 2 stick transponder HT2DC20S20
Table 2 Format of page3
Table 3 Bits of the configuration byte
Notes The coding in HITAG 2 operation is depending on bit0. The setting of this bit is One Time Programmable (OTP).
Do not set bit 6 of the configuration byte to logic 1 before having written the final data into page 3 (including the
configuration byte and password TAG) of the transponder. The setting of this bit is One Time Programmable (OTP).
Do not set bit 7 of the configuration byte to logic 1 before having written the final data into pages 1 and 2 of the
transponder.
Table 4 Standard values of the configuration byte
Philips Semiconductors Product specification
HIT AG 2 stick transponder HT2DC20S20
Definition of keys and passwordsKeys are cryptographic codes, which determine data
encryption during data transfer between the read and write
device and the transponder. They are used to select a
HT2DC20S20 transponderin the crypto mode. The 16-bit
key HIGH and 32-bit key LOW form one 48-bit key which
has to be identical on both the transponder and the read
and write device.
Passwords are needed to select a HT2DC20S20
transponder in the password mode. There is one pair of
passwords (password TAG and password RWD) which
has to be identical both on the transponder and the read
and write device: Password TAG
Password that the transponder sends to the read and
write device and which may be verified by the latter
(depending on the configuration of the read and write
device). Password RWD
Password that the read and write device sends to the
transponder and which is checked for identity by the
latter.
It is important that the following values are in accordance
with each other, i.e. the respective data on the read and
write device and on the transponder have to be identical
pairs.
The keys and passwords are predefined by Philips by
means of defined transport passwords and a transport
key. They can be written to memory, which means that
they can be changed (see also Section “Configuration of
delivered transponders”).
Remark: keys and passwords only canbe changedif their
current values are known!
Table 5 Keys and passwords for the read and write device and the transponder
Note Optional for both password and crypto mode; depending on the configuration of the read and write device.
Configuration of delivered transpondersHT2DC20S20 transponders are delivered with the following configuration.
Table 6 Configuration of delivered transponders
Note Before delivering transpondersto end users, pages1to3 shouldbe lockedby setting configuration byte:setbit6to
logic 1 for page 3 and set bit 7 to logic 1 for pages1 and2.
