ST25TV02K datasheet(16/90 Pages) STMICROELECTRONICS

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5.3

Untraceable mode

5.3.1

Untraceable mode register

Table 15. Untraceable mode register

Command

Enable untraceable mode (cmd code BAh) with pswd_id = 0h

Type

WO : only possible if untraceable mode password has been written before, always

writable otherwise

Bit

Name

Function

Factory value

b31-b0

UNTRACEABLE

_MODE_PSWD

Password value for feature untraceable mode

00000000h

Note:

Refer to Table 5. System configuration memory map for registers accessed through dedicated commands for the

untraceable mode register.

5.3.2

Untraceable mode description

With the EnableUntraceableMode command, the ST25TV02K/512 do not respond to any command except

Present Password and Get Random Number, guaranteeing the untraceability to customer requests.

The EnableUntraceableMode command requires the untraceable access code (fixed value) and the crypted

untraceable mode password to be presented for ST25TV02K/512 to enter into this mode.

To get out of the mode, the valid crypted untraceable mode password has to be transmitted to ST25TV02K/512

with the Present password command. The crypted untraceable mode password is obtained from the random

number and the untraceable mode password as explained in AN5103 "Password encryption for ST25TV512 and

ST25TV02K devices", available on www.st.com. When not used in an end application, a random value must be

written into the KILL_PWD password, and the KILL_PWD must be locked with Lock kill.

5.4

Random number

5.4.1

Random number register

Table 16. Random number register

Command

Get random number (cmd code B4h)

Type

RO: is only possible with Get random number command.

Bit

Name

Function

Factory value

b15-b0

RANDOM_NUMBER

16-bit random number generated by ST25TV02K/512

N/A

Note:

Refer to Table 5. System configuration memory map for registers accessed through dedicated commands for the

random number register.

5.4.2

Random number description

The GET_RANDOM_NUMBER returns a 16-bit random number.

ST25TV02K ST25TV512

Untraceable mode

DS12074 - Rev 11

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