NTP53X2 datasheet(79/133 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

79 / 133

Table 165 defines the response of NTAG 5 link to an AUTHENTICATE command for

MAM2.

For more detailed information, refer to ISO/IEC 29167-10.

Table 165. TReseponse for MAM2

TResponse MAM2 (0 bit)

Empty message (no data)

8.2.3.4.5 CHALLENGE

As defined in ISO/IEC 15693 and ISO/IEC 29167-10.

Command code = 39h

CSI code= 00h (AES Crypto Suite)

The CHALLENGE command transmits the message (challenge) to NTAG 5 link to

authenticate as defined in ISO/IEC 15693.

The CHALLENGE command can only be executed in the READY state and in not

addressed mode.

After receiving a valid CHALLENGE command, NTAG 5 link starts with the crypto

calculation.

If the calculation is finalized, NTAG 5 link will respond to a valid READBUFFER

command with the result of the crypto calculation based on the previous CHALLENGE

command message.

NTAG 5 link supports the Crypto Suite AES128 as defined in ISO/IEC 29167-10.

Only Option_flag = 0b is supported.

Table 166. CHALLENGE request format

Flags

CHALLENGE

UID

CSI

Message

CRC16

8 bits

64 bits (optional)

8 bits

96 bits

16 bits

Table 167 defines the message within the CHALLENGE command.

For more detailed information, refer to ISO/IEC 29167-10.

Table 167. Message format

AuthMethode

CustomData

TAM1_RFU

KeyID

IChallenge_TAM1

# of bits

Description

00b

00000b

[7:0]

random interrogator challenge

No response is sent on a CHALLENGE command.

For more detailed information, refer to ISO/IEC 29167-10.

8.2.3.4.6 READBUFFER

As defined in ISO/IEC 15693 and ISO/IEC 29167-10.

Command code = 3Ah

The READBUFFER command allows the interrogator to request the crypto calculation

result based on a valid previous CHALLENGE command from NTAG 5 link.

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