NTAG213F/216F
NXP Semiconductors
NFC Forum T2T IC with 144/888 bytes user memory and field detection
10.8 READ_SIG
The READ_SIG command returns an IC specific, 32-byte ECC signature, to verify NXP
Semiconductors as the silicon vendor. The signature is programmed at chip production
and cannot be changed afterwards. The command structure is shown in Figure 22 and
Table 39.
Table 40 shows the required timing.
NFC device
Cmd
Addr
CRC
Sign
2907 µs
CRC
NTAG ,,ACK''
T
T
ACK
NAK
368 µs
NTAG ,,NAK''
NAK
57 µs
T
TimeOut
Time out
aaa-006994
Fig 22. READ_SIG command
Table 39. READ_SIG command
Name
Cmd
Code
Description
Length
1 byte
1 byte
2 bytes
32 bytes
4 bit
3Ch
read ECC signature
RFU, is set to 00h
CRC according to Ref. 1
ECC signature
Addr
00h
CRC
-
Signature
NAK
-
see Table 21
see Section 9.3
Table 40. READ_SIG timing
These times exclude the end of communication of the NFC device.
TACK/NAK min
n=9[1]
TACK/NAK max
TTimeOut
5 ms
READ_SIG
TTimeOut
[1] Refer to Section 9.2 “Timings”.
Details on how to check the signature value are provided in the following Application note
(Ref. 5). It is foreseen to offer an online and offline way to verify originality of NTAG21xF.
NTAG213F_216F
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.1 — 28 August 2013
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