ST25DV04K datasheet(21/197 Pages) STMICROELECTRONICS

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ST25DVxxx specific features

ST25DVxxx offers the following features:

•

A fast transfer mode (FTM), to achieve a fast link between RF and contact worlds, via a 256 byte buffer

called Mailbox. This mailbox dynamic buffer of 256 byte can be filled or emptied via either RF or I2C.

•

A GPO pin, which indicates incoming event to the contact side, like RF Field changes, RF activity in

progress, RF writing completion or Mailbox message availability.

•

An Energy Harvesting element to deliver µW of power when external conditions make it possible.

•

RF management, which allows ST25DVxxx to ignore RF requests.

All these features can be programmed by setting static and/or dynamic registers of the ST25DVxxx. ST25DVxxx

can be partially customized using configuration registers located in the E2 system area.

These registers are:

•

dedicated to Data Memory organization and protection ENDAi, I2CSS, RFAiSS, LOCK_CCFILE.

•

dedicated to fast transfer mode MB_WDG, MB_MODE

•

dedicated to observation, GPO, IT_TIME

•

dedicated to RF , RF_MNGT, EH_MODE

•

dedicated the device’s structure LOCK_CFG

A set of additional registers allows to identify and customize the product (DSFID, AFI, IC_REF, etc.).

In I²C,

Read accesses to the static configuration register is always allowed, except for passwords. For dedicated

registers, write access is granted after prior successful presentation of the I2C password. Configuration register

are located from @00h to 0Fh in the system area (device code 111)

In RF

Dedicated commands Read Configuration and Write Configuration must be used to access the static

configuration registers. Update is only possible when the access right was granted by presenting the RF

configuration password (RF_PWD_0), and if the system configuration was not previously locked by the I2C host

(LOCK_CFG=1), which acts as security master.

After any valid write access to the static configuration registers, the new configuration is immediately applied.

Some of the static registers have a dynamic image (notice _Dyn) preset with the static register value:

GPO_CTRL_Dyn, EH_CTRL_Dyn, RF_MNGT_Dyn and MB_CTRL_Dyn.

When it exists, ST25DVxxx uses the dynamic configuration register to manage its processes. A dynamic

configuration register updated by the application will recover its default static value after a Power On Reset

(POR).

Other dynamic registers are dedicated to process monitoring:

•

I2C_SSO_Dyn is dedicated to data memory protection

•

MB_LEN_Dyn, MB_CTRL_Dyn are dedicated to fast transfer mode

•

IT_STS_Dyn is dedicated to interrupt

In I2C, read and write of the Dynamic registers is done using usual I2C read & write command at dedicated

address. (E2 =0 in device select).

In RF read or write accesses to the Dynamic registers are associated to the dedicated commands, Read Dynamic

Configuration, Write Dynamic Configuration and Read Message Length.

ST25DV04K ST25DV16K ST25DV64K

ST25DVxxx specific features

DS10925 - Rev 11

page 21/197

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