ST25DV04K datasheet(75/220 Pages) STMICROELECTRONICS

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ST25DV04K ST25DV16K ST25DV64K

ST25DVxxx specific features

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5.6.2

Passwords and security sessions

ST25DVxxx provides protection of user memory and system configuration static registers.

RF user and I2C host can access those protected data by opening security sessions with

the help of passwords. Access rights is more restricted when security sessions are closed,

and less restricted when security sessions are open.

Dynamic registers and fast transfer mode mailbox are not protected by any security session.

There is three type of security sessions, as shown in Table 41:

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.

Table 40. I2C_SSO_Dyn(1)

Command

No access

Type

I2C

Address

E2 = 0, 2004h

Type

Bit

Name

Function

Factory

Value

I2C_SSO

0: I2C security session close

1: I2C security session open

(Set or reset via I2C Present password command)

b7-b1

RFU

1. Refer to Table 9: Dynamic registers memory map for the I2C_SS0_Dyn register.

Table 41. 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)

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.

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