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Tag-it HF

The first 13.56MHz RFID IC that Texas Instruments developed was the Tag-it HF. Still in
high volume production, Tag-it HF is widely used in applications globally and has an
existing installed base of millions of tags. The Tag-it HF uses a protocol air interface that
is proprietary to Texas Instruments.
By contrast, the Tag-it HF-I was released by Texas Instruments in 2001 is compatible with
ISO/IEC 15693 parts -2 and -3. The host application developer should be aware of the
distinction between the Tag-it HF and the Tag-it HF-I.
Figure 7 - Memory Structure of the Tag-it HF
256 bits (32 bytes) of user memory is available for read/write.
Block #
0 (0x00)
1 (0x01)
2 (0x02)
.
.
.
6 (0x06)
7 (0x07)
A 32-bit ID (factory programmed) uniquely identifies each Tag-it HF chip.
TID
The complete Tag-it HF specification can be obtained from Texas Instruments.
50
32 bits
(4 bytes per block)
.
.
.
.
.
.
.
.
.
Unique Tag ID 32 bits (4 bytes)
The user can permanently lock any
.
block.
.
.
Once a block is locked it can not be
unlocked.

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