NTP53X2 datasheet(75/133 Pages) NXP

75 / 133 page

NXP Semiconductors

NTP53x2

NTAG 5 link - NFC Forum-compliant I2C bridge

NTP53x2

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.3 — 3 July 2020

COMPANY PUBLIC

544533

75 / 133

8.2.3.3.9 ENABLE NFC PRIVACY

Command code = BAh

The ENABLE NFC PRIVACY command in plain password mode enables NFC PRIVACY

mode (see Section 8.7) for NTAG 5 link if the Privacy password is correct.

The XOR password has to be calculated with the password and two times the received

random number from the last GET RANDOM NUMBER command:

XOR_Password[31:0] = Password[31:0] XOR {Random_Number[15:0],

Random_Number[15:0]}.

To get out of the NFC PRIVACY mode, the valid Privacy password has to be transmitted

to the IC with the DISABLE NFC PRIVACY command.

The timing of the command is write alike.

Option_flag = 0b and Option_flag = 1b is supported and is in accordance with ISO/IEC

15693 write-alike commands.

NOTE: In AES mode, Mutual Authentication with Purpose_MAM2 = 1001b needs to be

executed to enable the NFC PRIVACY mode for NTAG 5 link.

Table 150. ENABLE NFC PRIVACY request format

Flags

SET

PASSWORD

IC Mfg

code

UID

XOR

password

CRC16

8 bits

64 bits

optional

32 bits

16 bits

Table 151. ENABLE NFC PRIVACY response format when Error_flag is NOT set

Flags

CRC16

8 bits

16 bits

Table 152. ENABLE NFC PRIVACY response format when Error_flag is set

Flags

Error Code

CRC16

8 bits

16 bits

8.2.3.3.10 DISABLE NFC PRIVACY

Command code = B3h

The DISABLE NFC PRIVACY command moves the NTAG 5 link out of the NFC

PRIVACY mode.

Remark: The timing of the DISABLE PRIVACY command is write alike.

The XOR password has to be calculated with the password and two times the received

random number from the last GET RANDOM NUMBER command:

XOR_Password[31:0] = Password[31:0] XOR {Random_Number[15:0],

Random_Number[15:0]}.

The Privacy identifier is 04h.

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