NT3H2211W0FHKH Datasheet, PDF(50/77 Page) NXP Semiconductors – NTAG I2C plus, NFC Forum Type 2 Tag compliant IC with I2C interface

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NT3H2211W0FHKH Datasheet, PDF (50/77 Pages) NXP Semiconductors – NTAG I2C plus, NFC Forum Type 2 Tag compliant IC with I2C interface

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NXP Semiconductors

NT3H2111/NT3H2211

NFC Forum Type 2 Tag compliant IC with I2C interface

10.7 PWD_AUTH

A protected memory area can be accessed only after a successful password verification

using the PWD_AUTH command. The AUTH0 configuration byte defines the start of the

protected area. It specifies the first page that the password mechanism protects. The level

of protection can be configured using the NFC_PROT bit either for write protection or

read/write protection. The PWD_AUTH command takes the password as parameter and,

if successful, returns the password authentication acknowledge, PACK. By setting the

AUTHLIM configuration bits to a value larger than 000b, the number of unsuccessful

password verifications can be limited. Each unsuccessful authentication is then counted.

After reaching the limit (2AUTHLIM) of unsuccessful attempts, the memory write access or

the memory access at all (specified in NFC_PROT) to the protected area, is no longer

possible. The PWD_AUTH command is shown in Figure 23 and Table 25.

Table 26 shows the required timing.

NFC device

NTAG ,,ACK''

Cmd

NTAG ,,NAK''

Pwd

623 Î¼s

CRC

TACK

TNAK

PACK

CRC

368 Î¼s

NAK

57 Î¼s

Time out

Fig 23. PWD_AUTH command

TTimeOut

aaa-021658

Table 25.

Name

Cmd

Pwd

CRC

PACK

NAK

PWD_AUTH command

Code

Description

1Bh

password authentication

password

CRC according to Ref. 2

password authentication acknowledge

see Table 17 see Section 10.3

Length

1 byte

4 bytes

2 bytes

4-bit

Table 26. PWD_AUTH timing

These times exclude the end of communication of the NFC device.

PWD_AUTH

TACK/NAK min

n=9[1]

TACK/NAK max

TTimeOut

[1] Refer to Section 10.2 âTimingâ.

TTimeOut

5 ms

Remark: It is strongly recommended to change - and diversify for each tag - the password

and PACK from its delivery state at tag issuing.

NT3H2111/NT3H2211

Product data sheet

COMPANY PUBLIC

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

Rev. 3.0 â 3 February 2016

359930

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