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ST25DV04KC Datasheet(PDF) 60 Page - STMicroelectronics

Part # ST25DV04KC
Description  Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM, fast transfer mode capability and optimized I2C
PDF  203 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25DV04KC Datasheet(HTML) 60 Page - STMicroelectronics

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Figure 28. RF security sessions management
RF field OFF
RF field ON
ST25DV out
of RF field
All RF
security
sessions
closed
RF security
session x
opened
(y closed)
Any other
command
Present
RF_PWD_x OK
RF security
session y
opened
(x closed)
Present
RF_PWD_y OK
Present
RF_PWD_x OK
Present any RF
password not OK(1)
Any other
command
Any other
command
1. Presenting a password with an invalid password number doesn't close the session.
The dedicated password commands in I2C mode are:
•
I2C Write Password command: see Section 6.6.2 I2C write password command description.
•
I2C Present Password command: see Section 6.6.1 I2C present password command description.
I2C host possible actions for security sessions are:
•
Open I 2 C security session: I2C Present Password command with valid I2C password.
•
Write I 2 C password: I2C Present Password command with valid I2C password. Then I2C Write Password
command with new I2C password.
•
Close I 2 C security session: I2C Present Password command with wrong I2C password. Or remove tag
VCC power supply (POR).
•
Check if I 2 C security session is open: I2C host can read the current status (open or closed) of I2C
security session by reading the I2C_SSO_Dyn register.
There is no interaction between I2C and RF security sessions. Both are independent and can run in parallel.
ST25DV04KC ST25DV16KC ST25DV64KC
Data protection
DS13519 - Rev 3
page 60/203



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