NTP53X2 datasheet(24/133 Pages) NXP

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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

24 / 133

In plain password mode, NTAG 5 link implements the NFC Authentication Limit in

counting negative Password Authentication attempts with the SET PASSWORD

command, except for the Privacy password. The counter will be reset automatically to

zero after a successful authentication.

Table 21. NFC Authentication Limit Counter (NFC_AUTH_LIMIT) location

Block Address

NFC

I2C

Byte 0

Byte 1

Byte 2

Byte 3

0Eh

100Eh

NFC_AUTH_

LIMIT (LSB)

NFC_AUTH_

LIMIT (MSB)

RFU

Byte 0 of Block 0Eh is LSB and Byte 1 is MSB of the NFC Authentication Limit counter

value.

The Authentication limit is enabled with the most significant bit of Byte 1 is set to 1b. The

remaining 15 bits of NFC_AUTH_LIMIT are defining the preset value.

The start value for the Authentication Limit can be preset with a WRITE CONFIG

command (see Section 8.2.3.2.2) if

• the Crypto Config Header is not set to "Locked" and the NFC Global Crypto Header is

not set to "Activated" or

• a valid mutual authentication with a key with the Crypto Config privilege set has been

executed before.

In plain password mode, the Counter can be written with a WRITE CONFIG command

(see Section 8.2.3.2.2) if

• the Crypto Config Header is not set to "Locked" and NFC Global Crypto Header is not

set to "Locked", or

• a valid SET_PASSWORD command with the write password has been executed

before. In 64-bit password mode, both read and write passwords are required.

Examples:

• 8000h enables and presets the authentication limit to 0, which means the maximum

number of authentications (32767) before a preset is required again

• F000h enables and presets the authentication limit to 28672

If the NFC Authentication Limit is enabled, the authentication limit value is increased by

one at each CHALLENGE or AUTHENTICATE command (first step only). As soon as the

value of the Authentication limit reaches

• FF00h: only mutual authentication will be accepted to reset the authentication limit

• FFFFh: no further authentication is possible any longer. This status is irreversible.

Remark: The absolute maximum authentication limit value is FFFEh before a preset is

required, otherwise the authentication is irreversibly locked (no longer available).

From I2C perspective, this block can be read and written if not locked by the I2C section

lock.

8.1.3.7 NFC Key Header

The NFC Key Header bytes (NFC_KH0, NFC_KH1, NFC_KH2, NFC_KH3) define the

status for the related NFC key.

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