ST25TA02K datasheet(40/50 Pages) STMICROELECTRONICS

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RF command sets

ST25TA02K

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DocID027801 Rev 1

The FSCI codes the FSC which stands for the maximum frame size that the ST25TA02K is

able to receive. The ST25TA02K is able to receive up to 64 bytes of command. If the RF

host sends a command with more than 64 bytes, the ST25TA02K will not be able to treat the

command and will not reply.

The FWI which stands for the Frame Waiting time Integer codes the FWT. This time

corresponds to the maximum duration while an RF host shall send before sending the next

command.

The SFGI which stands for the Start-up Frame Guard Time is the minimum time that the

reader shall wait after receiving the response of the ST25TA02K.

5.9.3

PPS command & response(b)

PPS (Protocol and Parameter Selection) command and response are defined in ISO/IEC

14443-4, in the Protocol Activation of PICC Type A.

The PPS command allows to change the data rates of the ascending (RF host to

ST25TA02K) and descending (ST25TA02K to RF host) data rates. Usage of this command

is optional, ST25TA02K only supports 106 Kb/s in both direction.

Table 50. ATS response

Name

TA(1)

TB(1)

TC(1)

CRC

Byte field

0x05

0x75

0x80

0x60

0x02

2 bytes

Bit field

b8-b5

b4-b1

Length of the ATS

response

FSCI = 5 => FSC = 64 bytes

The maximum ascending data rate is 106 kbps

The maximum descending data rate is 106 kbps

FWI field (FWI = 6 => FWT = 19.2 ms)

SFGI field (SFGI = 0 => SFGT =302 µs)

The DID is supported

2 CRC bytes

b. Not useful in case of ST25TA02K which only support a Data Rate of 106 Kb/s in both direction.

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