ST25DV64K datasheet(56/200 Pages) STMICROELECTRONICS

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Table 69. Security session type

Security session

Open by presenting

Right granted when security session is open, and until it is closed

RF user

RF password 1, 2 or 3 (1)

(RF_PWD_1, RF_PWD_2,

RF_PWD_3)

RF user access to protected user memory as defined in RFAiSS registers

RF user write access to RF password 1, 2 or 3 (2)

RF configuration

RF password 0

(RF_PWD_0)

RF user write access to configuration static registers

RF user write access to RF password 0

I2C

I2C password

(I2C_PWD)

I2C host access to protected user memory as defined in I2CSS register

I2C host write access to configuration static registers

I2C host write access to I2C password

1. Password number must be the same as the one selected for protection.

2. Write access to the password number corresponding to the password number presented.

All passwords are 64-bits long, and default factory passwords value is 0000000000000000h.

The ST25DVxxx passwords management is organized around RF and I2C dedicated set of commands to access

the dedicated registers in system configuration area where password values are stored.

The dedicated password commands in RF mode are:

•

Write Password command (code B1h): see Section 7.6.35 Write Password.

•

Present Password command (code B3h): see Section 7.6.36 Present Password.

RF user possible actions for security sessions are:

•

Open RF user security session: Present Password command, with password number 1, 2 or 3 and the

valid corresponding password

•

Write RF password: Present Password command, with password number (0, 1, 2 or 3) and the current valid

corresponding password. Then Write Password command, with same password number (0, 1, 2 or 3) and

the new corresponding password.

•

Close RF user security session: Present Password command, with a different password number than

the one used to open session or any wrong password. Or remove tag from RF field (POR). Presenting a

password with an invalid password number doesn't close the session.

•

Open RF configuration security session: Present Password command, with password number 0 and the

valid password 0.

•

Close RF configuration security session: Present Password command, with a password number different

than 0, or password number 0 and wrong password 0. Or remove tag from RF field (POR). Presenting a

password with an invalid password number doesn't close the session.

Opening any new RF security session (user or configuration) automatically close the previously open one (even if

it fails).

There is no interaction between I2C and RF security sessions. Both are independent, and can run in parallel.

Caution:

If ST25DVxxx is powered through VCC, removing VCC during a RF command can abort the command. As a

consequence, before writing a new password, RF user should check if VCC is ON, by reading EH_CTRL_Dyn

Password command in order to avoid password corruption.

To make the application more robust, it is recommended to use addressed or selected mode during write

password operations to get the traceability of which tags/UID have been programmed.

ST25DV04K ST25DV16K ST25DV64K

Data Protection

DS10925 - Rev 9

page 56/200

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