ST25DV04K datasheet(47/200 Pages) STMICROELECTRONICS

47 / 200 page

5.5

Interface Arbitration

ST25DVxxx automatically arbitrates the exclusive usage of RF and I2C interfaces. Arbitration scheme obeys to

“first talk first served” basic law. (see Figure 21. ST25DVxxx, Arbitration between RF and I2C).

Figure 21. ST25DVxxx, Arbitration between RF and I2C

Power OFF

Boot

RF mute

I2C mute

RF busy

(I2C commamds

are NoAck)

ST25DV standby

RF free

I2C free

I2C busy

(0Fh or no

response to RF

requests)

VCC ON

RF field ON

Boot done

I2C start

I2C transition terminated

RF request SOF

RF transaction terminated

RF transaction is terminated:

•

at response EOF if answer.

•

at request EOF is no answer.

•

at RF field OFF.

I2C transaction is terminated:

•

at the end of EEPROM programming time after the stop condition of a successful write into EEPROM (user

memory or system configuration). See Section 6.4 I2C Write operations for write time calculation

•

at stop condition for any other I2C transaction

•

at VCC power off

•

at any I2C error (terminated before stop condition)

•

at I2C timeout if it occurs

When RF is busy, I2C interface answers by NoAck on any I2C command.

When I2C is busy, RF commands receive no response (Inventory, Stay quiet, addressed commands) or error code

0Fh for any other command.

ST25DV04K ST25DV16K ST25DV64K

Interface Arbitration

DS10925 - Rev 9

page 47/200

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