ST25DV04KC datasheet(33/203 Pages) STMICROELECTRONICS

33 / 203 page

•

If there is a write in progress in EEPROM memory, following an RF write command execution, the RF is set

in off mode at the completion of the write in memory. ST25DVxxKC does not answer to the RF request, but

data is written into memory. If GPO interruption RF_OFF is enabled, a pulse is emitted on GPO pin at end of

all write programming cycles.

•

If there is no write in progress in EEPROM memory, the RF is set in RF off mode immediately. ST25DVxxKC

does not answer to the RF request. If GPO interruption RF_OFF is enabled, a pulse is emitted on GPO pin

after stop condition of the I2C “RFSwitchOff” command.

Once in RF off mode, I2C host get exclusive access to the ST25DVxxKC, whatever incoming RF requests (which

are ignored).

5.4

GPO

GPO signal is used to alert the I2C host of external RF events or ST25DVxxKC processes activity and also if

some specific I2C events. Several causes could be used to request a host interruption. RF user can also directly

drive GPO pin level using a dedicated RF command.

5.4.1

ST25DVxxKC interrupt capabilities on RF events

ST25DVxxx supports multi interruption mode and can report several events occurring through RF interface.

In this section, all drawings are referring to the open drain version of GPO output (8-pin packages).

The reader can retrieve the behaviour of CMOS version (12-pin package) by inverting the GPO curve polarity and

replace the word “released” or “high-Z” by “pull to ground”.

Supported RF events is listed hereafter:

ST25DV04KC ST25DV16KC ST25DV64KC

GPO

DS13519 - Rev 3

page 33/203

ST25DV04KC Datasheet(PDF) 33 Page - STMicroelectronics