SRTAG2K-D View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
SRTAG2K-D
STMicroelectronics
'SRTAG2K-D' PDF : 51 Pages View PDF
RF command sets
b7-b6
0b10
R-Block
RFU
0: NAK
1: ACK
0: DID field is not present
1: DID field is present
Must be set to 0
RFU
Block number
Table 15. R-Block detailed format
b5
b4
b3
b2
1
X
X
0
SRTAG2K-D
b1
b0
0
X
5.4
S-Block format
The S-Block is used to exchange control information between a reader and a contactless
tag.
NFC frame
Table 16. S-Block format
SoD
PCB
DID
Payload
EoD
CRC
Length
1 byte
1 byte
1 to 255 bytes
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 (1)
2 CRC bytes
1. This field is present when b5-b4 bits are set to 0b11 (S-Block is a WTX). see Table 17: S-Block detailed format.
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 or I2C, when the operating time
needed by M24SRxx is greater than 9.6 ms.
The WTX field indicates the increase time factor to be used in this command execution
(FDTtemp = WTX * 9.6 ms).
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