ST25TV02K datasheet(14/90 Pages) STMICROELECTRONICS

14 / 90 page

•

Open user security session: Present Password command, with password identifier 1 for PWD_A1 and 2

for PWD_A2 for three areas configuration or identifier 1 for PWD_A1 for two areas configuration, and the

valid corresponding password

•

Write password:

–

When MEMORG=0:

Present Password command, with password identifier 1 for PWD_A1 and 2 for PWD_A2 and the

current valid corresponding password. Then Write Password command, with same password number

(1 or 2) and the new corresponding password.

–

When MEMORG=1:

present PWD_A1 (64 bits), then Write Password command with PWD_A1 and then PWD_A2

•

Close 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).

•

Open configuration security session: Present Password command, with password number 3 and the valid

password PWD_CFG.

•

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

than 3, or password number 3 and wrong password PWD_CFG. Or remove tag from field (POR).

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

fails).

Figure 6. Security sessions management

Field OFF

Field ON

ST25TVxxx

out of RF field

All security

sessions

closed

Security

session x

opened

(y closed)

Any other

command

Present

PWD_x OK

Security

session y

opened

(x closed)

Present

PWD_y OK

Present

PWD_x OK

Present any

password not OK

Any other

command

Any other

command

ST25TV02K ST25TV512

Data protection

DS12074 - Rev 11

page 14/90

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