NTAG213F/216F
NXP Semiconductors
NFC Forum T2T IC with 144/888 bytes user memory and field detection
9.4 ATQA and SAK responses
NTAG21xF replies to a REQA or WUPA command with the ATQA value shown in
Table 22. It replies to a Select CL2 command with the SAK value shown in Table 23. The
2-byte ATQA value is transmitted with the least significant byte first (44h).
Table 22. ATQA response of the NTAG21xF
Bit number
Sales type
Hex value
16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
NTAG21xF
00 44h
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
Table 23. SAK response of the NTAG21xF
Bit number
Sales type
Hex value
8
7
6
5
4
3
2
1
NTAG21xF
00h
0
0
0
0
0
0
0
0
Remark: The ATQA coding in bits 7 and 8 indicate the UID size according to
ISO/IEC 14443 independent from the settings of the UID usage.
Remark: The bit numbering in the ISO/IEC 14443 starts with LSB = bit 1 and not with
LSB = bit 0. So 1 byte counts bit 1 to bit 8 instead of bit 0 to 7.
10. NTAG21xF commands
10.1 GET_VERSION
The GET_VERSION command is used to retrieve information on the NTAG family, the
product version, storage size and other product data required to identify the specific
NTAG21xF.
This command is also available on other NTAG products to have a common way of
identifying products across platforms and evolution steps.
The GET_VERSION command has no arguments and replies the version information for
the specific NTAG21xF type. The command structure is shown in Figure 14 and Table 24.
Table 25 shows the required timing.
NFC device
Cmd
CRC
Data
868 µs
CRC
NTAG ,,ACK''
T
T
ACK
NAK
283 µs
NAK
NTAG ,,NAK''
57 µs
T
TimeOut
Time out
aaa-006987
Fig 14. GET_VERSION command
NTAG213F_216F
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Product data sheet
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Rev. 3.1 — 28 August 2013
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