NTP53X2 datasheet(111/133 Pages) NXP

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NXP Semiconductors

NTP53x2

NTAG 5 link - NFC Forum-compliant I2C bridge

NTP53x2

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Product data sheet

Rev. 3.3 — 3 July 2020

COMPANY PUBLIC

544533

111 / 133

8.7 NFC privacy mode

In the privacy mode, the NTAG 5 link is not traceable by its UID neither by data stored

in the user memory. All NTAG 5 link in the NFC PRIVACY mode will respond to an

Inventory command with the UID E0 04 00 00 00 00 00 00, consequently also the user

memory is NOT accessible.

NTOE: An anti-collision procedure is not possible in plain password mode.

In plain password mode ENABLE NFC PRIVACY Mode command (see

Section 8.2.3.3.9) with a valid privacy password is used to set NTAG 5 link to this mode

and DISABLE NFC PRIVACY (see Section 8.2.3.3.10) is used to disable it again.

In AES mode, a valid mutual authentication (see Section 8.2.3.4.4) with the vendor-

specific Purpose_MAM2[3:0] (see Table 164) and a key with the privacy privilege set to

1b is needed to enable using Purpose_MAM2 = 1001b and disable the NFC PRIVACY

mode using Purpose_MAM2 = 1000b until next NFC field reset or 1010b permanently.

NTAG 5 link in NFC PRIVACY mode only support following commands:

• INVENTORY

• SELECT

• STAY QUIET

• RESET TO READY

• PICK RANDOM ID (in AES mode to allow an anti-collision procedure)

• GET RANDOM NUMBER

• DISABLE NFC PRIVACY in plain password mode

• AUTHENTICATE

8.8 Programmable Originality signature

NTAG 5 link original signature is based on standard Elliptic Curve Cryptography (curve

name secp128r1), according to the ECDSA algorithm. The use of a standard algorithm

and curve ensures easy software integration of the originality check procedure in NFC

devices without specific hardware requirements.

The UID is signed with an NXP private key and the resulting 32 byte signature is stored

in the configuration memory during IC production.

The originality signature is stored in the configuration memory block 00h to block 07h.

Table 233. 32 Byte Originality Signature

Block Address

NFC

I2C

Byte 0

Byte 1

Byte 2

Byte 3

00h

1000h

SIG0 (LSB)

SIG1

SIG2

SIG3

01h

1001h

SIG4

SIG5

SIG6

SIG7

02h

1002h

SIG8

SIG9

SIG10

SIG11

03h

1003h

SIG12

SIG13

SIG14

SIG15

04h

1004h

SIG16

SIG17

SIG18

SIG19

05h

1005h

SIG20

SIG21

SIG22

SIG23

06h

1006h

SIG24

SIG25

SIG26

SIG27

07h

1007h

SIG28

SIG29

SIG30

SIG31 (MSB)

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