SRTAG2K-D datasheet(37/51 Pages) STMICROELECTRONICS

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SRTAG2K-D

RF command sets

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

receive. Table 47 gives the conversion from FDSI to FSD.

The DID field defines the value of the addressed SRTAG2K-D.

The FSCI codes the FSC which stands for the maximum frame size that the SRTAG2K-D is

able to receive. The SRTAG2K-D is able to receive up to 256 bytes of command. If the RF

host sends a command with more than 256 bytes, the SRTAG2K-D 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 SRTAG2K-D.

5.9.3

PPS command & response

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 SRTAG2K-

D) and descending (SRTAG2K-D to RF host) data rates.

Table 47. Conversion from FDSI to FSD

FSDI

0x0

0x1

0x2

0x3

0x4

0x5

0x6

0x7

0x8

0x9h-

0xE

0xF

FSD

128

256

RFU

256

Table 48. ATS response

Name

TA(1)

TB(1)

TC(1)

CRC

Byte field

0x05

0x78

1 byte

0x02

2 bytes

Bit field

b8-b5

b4-b1

Length of the ATS response

FSCI = 256 bytes

The maximum ascending data rate is 106 kbps

The maximum descending data rate is 106 kbps

FWI field (9.6 ms when TB = 0x50)

SFGI field (302 µs when TB = 0x50)

The DID is supported

2 CRC bytes

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