ST25DV04K datasheet(42/220 Pages) STMICROELECTRONICS

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ST25DVxxx specific features

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DocID027603 Rev 4

A I2C reading operation will never clear HOST_PUT_MSG, and the message remains

available for RF.

An I2C read can start at any address inside the mailbox (between address 2008h and

2107h).

A I2C write operation must start from the first mailbox location, at address 2008h. After

reaching the Mailbox border at address 2107h all bytes are NACK and the command is not

executed (rollover feature not supported).

At the end of a successful I2C message write, the message length is automatically set into

MB_LEN_Dyn register, and HOST_PUT_MSG bit is set into MB_CTRL_Dyn register, and

the write access to the mailbox is not possible until the mailbox has been released again.

RF access to mailbox

The RF Control & Access to mailbox is possible using dedicated custom commands:

•

Read Dynamic Configuration and Fast Read Dynamic Configuration to check

availability of mailbox.

•

Write Dynamic Configuration and Fast Write Dynamic configuration to enable or

disable fast transfer mode.

•

Read Message Length and Fast Read Message Length to get the length of the

contained message,

•

Read Message and Fast Read Message to download the content of the mailbox,

•

Write Message and Fast Write Message to put a new message in mailbox. (New length

is automatically updated after completion of a successful Write Message or Fast Write

Message command).

HOST_PUT_MSG is cleared following a valid reading of the last message byte, and mailbox

is considered free (but message is not cleared and is still present in the mailbox).

A RF read can start at any address of inside the message, but return an error 0Fh if trying to

read after the last byte of the message.

A RF reading operation will never clear RF_PUT_MSG , the message will remain available

for I2C.

At the end of a successful RF message write, the message length is automatically set in

MB_LEN_Dyn register, and RF_PUT_MSG bit is set in MB_CTRL_Dyn register. and write

access to the mailbox is not possible until mailbox has been freed again.

The presence of a DC supply is mandatory to get RF access to the mailbox. VCC_ON can

be checked reading the dynamic register EH_CTRL_Dyn.

To get more details about sequences to prepare and initiate a Fast Transfer, to detect

progress of a fast transfer or to control and execute a fast transfer, please refer to AN4910.

How to exchange data between wired (I2C) and wireless world (RF ISO15693) using fast

transfer mode supported by ST25DVxxx).

ST25DV04K Datasheet(PDF) 42 Page - STMicroelectronics

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