M24SR02-YMF7T/2 Просмотр технического описания (PDF) - STMicroelectronics

Номер в каталоге

Компоненты Описание

производитель

M24SR02-YMF7T/2

Dynamic NFC/RFID tag IC with 2-Kbit EEPROM, NFC Forum Type 4 Tag and I²C interface

STMicroelectronics 

M24SR02-Y

M24SR02-Y memory management

3.2.3

Changing the write access right to NDEF files

The state diagram on Figure 1 shows how to change the write access right to an NDEF file.

Figure 11. Changing the write access right to an NDEF file

3.3

3.4

>ŽĐŬƚŚĞE&ĨŝůĞ;ϭͿ

ϬdžϬϬ

hŶůŽĐŬƚŚĞE&ĨŝůĞ;ϮͿ

ϬdžϴϬ;ϰͿ

WĞƌŵĂŶĞŶƚůLJůŽĐŬƚŚĞE&ĨŝůĞ;ϯͿ

Ϭdž&&

WĞƌŵĂŶĞŶƚůLJƵŶůŽĐŬƚŚĞE&ĨŝůĞ

D^ϯϬϳϳϯsϰ

1. See the procedure to lock the write access.

2. See the procedure to unlock the write access.

3. See the procedure to permanently lock the write access (Section 8.6: Reaching the read-only state for an

NDEF file).

4. Proprietary state, not defined by NFC Forum Type 4 Tag. For NFC Forum compatible tags, it is mandatory

that the write access rights are set to either 0x00 (no restrictions on writes) or 0xFF (permanently locked).

0x80 might not be fully decoded with some smart phones.

Access right life time

The access right life time is validated while the NDEF file is selected or until the end of the

RF or I²C session. Once the read or write access right is granted, the host can send one or

more ReadBinary or UpdateBinary commands.

At the end of a session or when the host selects another file, the read and write access

rights are initialized.

NDEF file passwords

The NDEF file passwords protect the read or write access from an RF or I²C interface

from/to an NDEF file.

Two NDEF file passwords are available for each NDEF file:

• Read password

• Write password

The length of a password is 128 bits (16 bytes).

DocID025386 Rev 10

27/90

28

Share Link: