HT2DC20S20

` 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.

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 HT2DC20S20 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 HT2DC20S20 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 of HT2DC20S20 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).