ST25TV02K datasheet(27/90 Pages) STMICROELECTRONICS

27 / 90 page

Table 31. response depending on Request_flags

Flags

Address_flag

Select_flag

Addressed

Non addressed

Selected

Non selected

ST25TV02K/512 in Ready or Selected state (Devices in Quiet state

do not answer)

ST25TV02K/512 in Selected state

ST25TV02K/512 in Ready, Quiet or Selected state (the device

which matches the UID)

Error (03h) or no response (command dependent)

Figure 9. state transition diagram

In RF field

Stay quiet(UID)

Select (UID)

Any other command

Inventory

Out of RF field

after tRF_OFF

Out of RF field

after tRF_OFF

Out of field

after tRF_OFF

Any other command where the

Address_Flag is set AND where

the Inventory_Flag is not set

Any other command

where Select_Flag

is not set

Power off

Quiet

Selected

Ready

The ST25TV02K/512 return to the Power Off state if the tag is out of the field for at least tRF_OFF.

The intention of the state transition method is that only one ST25TV02K/512 should be in the Selected state at a

time.

When the Select_flag is set to 1, the request shall NOT contain a unique ID.

When the address_flag is set to 0, the request shall NOT contain a unique ID.

6.2.3

Modes

The term “mode” refers to the mechanism used in a request to specify the set of ST25TV02K/512 devices that

shall execute the request.

Addressed mode

When the Address_flag is set to 1 (Addressed mode), the request contains the Unique ID (UID) of the addressed

ST25TV02K/512.

ST25TV02K ST25TV512

RF protocol description

DS12074 - Rev 11

page 27/90

ST25TV02K Datasheet(PDF) 27 Page - STMicroelectronics

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