LRI512 datasheet(15/54 Pages) STMICROELECTRONICS

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LRI512

UNIQUE IDENTIFIER (UID)

The LRI512s are uniquely identified by a 64-bit

Unique Identifier (UID). This UID complies with

ISO/IEC 15963 and ISO/IEC 7816-6. The UID is a

read only code, and comprises:

– The 8 MSB is E0h

– The IC Manufacturer code of ST 02h, on 8 bits

(ISO/IEC 7816-6/AM1)

– A Unique Serial Number on 48 bits.

The UID is used for addressing each LRI512

uniquely and individually, during the anti-collision

loop and for one-to-one exchange between a VCD

and a LRI512.

Table 5. UID Format

APPLICATION FAMILY IDENTIFIER (AFI)

The AFI (Application Family Identifier) describes

the type of application targeted by the VCD, and is

used to extract from all the LRI512s present only

the LRI512s meeting the required application cri-

teria.

It is programmed by the LRI512 issuer in the AFI

be modified.

The most significant nibble of AFI is used to code

one specific or all application families.

The least significant nibble of AFI is used to code

one specific or all application sub-families. Sub-

family codes, other than 0, are proprietary.

(See ISO 15693-3 documentation)

Figure 28. LRI512 Decision Tree for AFI

CRC

The CRC used in the LRI512 is calculated as per

the definition in ISO/IEC 13239.

The initial register content is all ones: FFFFh.

The 2-byte CRC is appended to each Request and

each Response, within each frame, before the

EOF. The CRC is calculated on all the bytes after

the SOF up to the CRC field.

Upon reception of a Request from the VCD, the

LRI512 verifies that the CRC value is valid. If it is

invalid, it discards the frame, and does not answer

the VCD.

Upon reception of a Response from the LRI512, it

is recommended that the VCD verify that the CRC

value is valid. If it is invalid, actions to be per-

formed are left to the responsibility of the VCD de-

signer.

The CRC is transmitted Least Significant Byte first.

Each byte is transmitted Least Significant Bit first.

Table 6. CRC Transmission Rules

MSB

LSB

E0h

02h

Unique Serial Number

AI06679

Inventory Request

Received

No Answer

Yes

AFI value

= 0 ?

Yes

AFI Flag

Set ?

Yes

Answer given by the LRI512

to the Inventory Request

AFI value

= Internal

value ?

LSByte

MSByte

LSBit

MSBit

LSBit

MSBit

CRC 16 (8bits)

CRC 16 (8 bits)

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