User's Manual

38
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 6 - Memory Structure of the Tag-it HF
256 bits (32 bytes) of user memory is available for read/write.
Block #
32 bits
(4 bytes per block)
0 (0x00)
1 (0x01)
2 (0x02)
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
6 (0x06)
7 (0x07)
The user can permanently lock any
block.
Once a block is locked it can not be
unlocked.
A 32-bit ID (factory programmed) uniquely identifies each Tag-it HF chip.
TID Unique Tag ID 32 bits (4 bytes)
The complete Tag-it HF specification can be obtained from Texas Instruments.