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ST25DV04K Datasheet(PDF) 76 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 76 Page - STMicroelectronics |
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76 / 220 page  ST25DVxxx specific features ST25DV04K ST25DV16K ST25DV64K 76/220 DocID027603 Rev 4 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). • 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). 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 or setting LPD high 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 register bit 3 (VCC_ON), and eventually ask host to maintain or to shut down VCC, and not change voltage applied on LPD while issuing the Write Password command in order to avoid password corruption. |
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