ST25TB02K datasheet(31/47 Pages) STMICROELECTRONICS

31 / 47 page

8.9

Get_UID() command

Command code = 0Bh

On receiving the Get_UID command, the ST25TB02K returns its 8 UID bytes. UID bytes are transmitted with the

least significant byte first, and each byte is transmitted with the least significant bit first.

The ST25TB02K must have received a Select() command and be switched to Selected state before any

Get_UID() command can be accepted. All Get_UID() commands sent to the ST25TB02K before a Select()

command is issued, are ignored.

Figure 42. Get_UID request format

SOF

CRCL

EOF

8 bits

CRCH

Get_IUD

0Bh

Request parameter:

•

No parameter

Figure 43. Get_UID response format

SOF

UID 4

CRCL

EOF

8 bits

CRCH

8 bits

UID 5

UID 6

UID 7

UID 0

UID 3

8 bits

UID 1

UID 2

8 bits

Response parameters:

•

UID 0: Less significant UID byte

•

UID 1 to UID 6: UID bytes

•

UID 7: Most significant UID byte.

Unique identifier (UID)

Members of the ST25TB02K family are uniquely identified by a 64-bit unique identifier (UID). This is used for

addressing each ST25TB02K device uniquely after the anticollision loop. The UID complies with ISO/IEC 15963

and ISO/IEC 7816-6. It is a read-only code, and comprises (as summarized in Figure 44. 64-bit unique identifier of

the ST25TB02K):

•

an 8-bit prefix, with the most significant bits set to D0h

•

an 8-bit IC manufacturer code (ISO/IEC 7816-6/AM1) set to 02h (for STMicroelectronics)

•

a 8-bit product ref code set to 3Fh for ST25TB02K

•

a 40-bit unique serial number

ST25TB02K

Get_UID() command

DS11469 - Rev 7

page 31/47

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