NTP53X2 datasheet(25/133 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

25 / 133

The programming of NFC Key Header can be done in only one direction from lower state

to higher and it is irreversible from NFC perspective.

Same rules apply from I2C perspective, as long as not locked by the I2C section lock.

Once locked (as per table below) cannot be updated anymore from I2C interface.

Table below shows the location of the NFC Key Headers in the configuration memory.

When using password authentication, these bytes and blocks are all RFU.

NOTE: Key headers are only available for NTP5332 in AES mode.

Table 22. NFC Key Header (KHx) location

Block Address

NFC

I2C

Byte 0

Byte 1

Byte 2

Byte 3

10h

1010h

RFU

NFC_KH0*

RFU

12h

1012h

RFU

NFC_KH1*

RFU

14h

1014h

RFU

NFC_KH2*

RFU

16h

1016h

RFU

NFC_KH3*

RFU

If the Global Crypto Header is in the "Activate and locked" state, all crypto settings (Key

Headers, Keys and Privileges) are locked and cannot longer be modified.

Table 23. NFC Key Header Values

Value Status

Description

81h

Not active (default)

The related Key and the Key Privileges can be read and

written with the READ CONFIG and WRITE CONFIG

commands. The related key is not active and cannot be

used. The Key Privileges of the related Key are not valid.

E7h

Active and locked

The related Key and its privileges are active and locked

and cannot be modified any longer. The related Key

cannot be read or written with the READ CONFIG and

WRITE CONFIG commands. The related Key Header and

Key Privileges can only be read with the READ CONFIG

command.

FFh

Disabled

Related Key is disabled and cannot be used

Remark: It is recommended to set the key header for not required keys to disabled

(FFh).

8.1.3.8 NFC Key Privileges

The NFC Key Privileges bytes define the privileges for the related key. Writing with

WRITE CONFIG command to the related block depends on the status of the related NFC

Key Header (see Table 23)

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

lock.

Table shows the location of the Key Privileges in the configuration memory.

NOTE: Key privileges are only available for NTP5332.

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