ST25DV16KC-JF8D3 datasheet(29/203 Pages) STMICROELECTRONICS

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The RF_DISABLE and RF_SLEEP bits are accessible in Read and Write with the user memory I2C salve

address, followed by memory address of RF_MNGT_Dyn register.

5.2.2

RF management feature description

RF communication capabilities between ST25DVxxKC and an RF reader can be controlled by configuring the RF

mode. ST25DVxxKC offers four RF modes:

•

RF normal mode (default mode)

•

RF disable mode

•

RF sleep mode

•

RF off mode

The RF_MNGT and RF_MNGT_Dyn registers are used to configure and control the RF mode.

At boot time, and each time the RF_MNGT register is updated, content of RF_MNGT_Dyn register is copied from

RF_MNGT register.

The content of the dynamic register RF_MNGT_Dyn can be updated on the fly, to temporarily modify the

behaviour of ST25DVxxKC without affecting the static value of RF_MNGT register which is recovered at next

POR.

RF normal mode:

In normal usage, and if I2C interface is not busy (see Section 5.3 Interface arbitration) , the ST25DVxxKC

processes the RF request and respond accordingly. In this mode, all bits of RF_MNGT_Dyn are set to 0.

RF disable mode:

In disable mode, RF commands are interpreted but not executed. In case of a valid command, the ST25DVxxKC

responds after t1 with the error 0Fh, and stay mute to the Inventory command.

ISO15693 state and RF security sessions status are unchanged.

In this mode, bit 0 of RF_MNGT_Dyn, RF_DISABLE, is set to 1 and all other bits are set to 0

RF sleep mode:

In sleep mode, all RF communication are disabled and RF interface doesn't interpret any RF commands.

ISO15693 state and RF security sessions status are unchanged.

In this mode, bit 1 of RF_MNGT_Dyn, RF_SLEEP, is set to 1 and bit 2, RF_OFF, is set to 0 (bit 0, RF_DISABLE is

don't care).

RF off mode:

In off mode, all RF communication are disabled and RF interface doesn't interpret any RF commands.

ISO15693 state is reset and RF security sessions are closed.

In this mode, bit 2 of RF_MNGT_Dyn, RF_OFF, is set to 1 and other bits are don't care.

RF sleep and RF disable modes are controlled through writing in RF_SLEEP and RF_DISABLE bits in RF_MNGT

RF off mode is controlled exclusively from I2C. An I2C “RFSwitchOff” command allows to switch off the RF and

an I2C “RFSwitchOn” command allows to switch on the RF. Entering RF off mode set the RF_MNGT_Dyn bit 2,

RF_OFF, to 1 (see Section 5.3 Interface arbitration for details on the I2C “RFSwitchOff” and I2C “RFSwitchOn”

commands).

Different RF modes have priority levels: RF off mode has priority over RF sleep mode, which has priority over RF

disable mode.

Effect of updating RF_MNGT or RF_MNGT_Dyn registers is immediate.

Effect of I2C “RFSwtichOff” command can be immediate or be effective at the end of a write in progress in

EEPROM memory, to avoid any data corruption. A pulse can be generated on GPO pin to indicate to the I2C host

exactly when the ST25DVxxKC enters in RF off mode following a valid I2C “RFSwitchOff” command.

ST25DV04KC ST25DV16KC ST25DV64KC

RF management feature

DS13519 - Rev 3

page 29/203

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