ST25TA02K datasheet(39/50 Pages) STMICROELECTRONICS

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ST25TA02K

RF command sets

5.9.2

RATS command and ATS response

RATS command and ATS response are used for NFC Forum Type 4A Tag Platform Device

Activation (as defined in NFC Forum Digital Protocol specification).

Table 48 details the RATS command. This command shall be sent after the anticollision

process.

The FSDI field codes the FSD that defines the maximum size that an RF host is able to

receive. Table 49 gives the conversion from FDSI to FSD.

The DID field defines the value of the addressed ST25TA02K.

SEL_REQ 1

93 70 CT

uid1 uid2

uid3 BBC

NVB 70

(cmd NVB Uid lower bytes)

CT Cascade Tag “0x88”

SAK & CRC

04 DAD7

UID Not complete

SDD_REQ 2

95 20

NVB 20

Number Valid bit

(2 bytes Code & NVB)

uid4 uid5

uid6 uid7

BCC

(UID 7bytes)

BCC Block Check

Character

(XOR previous Bytes)

SEL_REQ 1

95 70

uid4 uid5

uid6 uid7

BBC

NVB 70

(cmd NVB Uid Upper

bytes)

SAK & CRC

20 FC70

UID complete

Table 47. Example of anticollision sequence (continued)

Command

Code

Comment

Response

Code

Comment

Table 48. RATS command

Name

INS

Param

CRC

Byte field

0xE0

1 byte

2 bytes

Bit field

b7-b4

b3-b0

Instruction code

FSDI

DID (0

≤ DID ≤ 14)

2 CRC bytes

Table 49. Conversion from FDSI to FSD

FSDI

0x0

0x1

0x2

0x3

0x4

0x5

0x6

0x7

0x8

0x9h-

0xE

0xF

FSD

128

256

RFU

256

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