ST25TA02K-PC6C5 datasheet(33/64 Pages) STMICROELECTRONICS

33 / 64 page

DocID027794 Rev 2

33/64

ST25TA02K-P

RF command sets

5.4

S-Block format

The S-Block is used to exchange control information between a reader and a contactless

tag.

There are two requests using the S-Block format:

•

S(DES): the deselect command

•

S(WTX): the Waiting Frame eXtension command or response.

A Waiting Time eXtension request occurs in RF when the operating time needed by

ST25TA02K-P is greater than 19.2 ms.

The WTX field indicates the increase time factor to be used in this command execution

(FDTtemp = WTX * 19.2 ms). WTX depends on FWI.

Table 18. S-Block format

NFC frame

SoD

EoD

PCB

DID

Payload

CRC

Length

1 byte

2 bytes

0xC2: for S(DES) when the DID field is not present

0xCA: for S(DES) when the DID field is present

0xF2: for S(WTX) when the DID field is not present

0xFA: for S(WTX) when the DID field is present

DID field (optional)

WTX field (optional)(1)

1. This field is present when b5-b4 bits are set to 0b11 (S-Block is a WTX). see Table 19: S-Block detailed

format.

2 CRC bytes

Table 19. S-Block detailed format

b7-b6

b5-b4

0b11

S-Block

0b00: Deselect

0b11: WTX

0: DID field is not present

1: DID field is present

Must be set to 0

Must be set to 1

Must be set to 0

ST25TA02K-PC6C5 Datasheet(PDF) 33 Page - STMicroelectronics

ST25TA02K-PC6C5 Datasheet(HTML) 33 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

Datasheet Download

Link URL