ST25DV64K datasheet(74/197 Pages) STMICROELECTRONICS

74 / 197 page

Selected state

In the Selected state, the ST25DVxxx answers any request in all modes (see Section 7.4.3 Modes):

•

Request in Select mode with the Select_flag set

•

Request in Addressed mode if the UID matches

•

Request in Non-Addressed mode as it is the mode for general requests

Table 92. ST25DVxxx response depending on Request_flags

Flags

Address_flag

Select_flag

Addressed

Non addressed

Selected

Non selected

ST25DVxxx in Ready or Selected state

(Devices in Quiet state do not answer)

ST25DVxxx in Selected state

ST25DVxxx in Ready, Quiet or Selected

state (the device which matches the

UID)

Error (03h) or no response (command

dependent)

Figure 33. ST25DVxxx 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 ST25DVxxx returns to the Power Off state if the tag is out of the RF field for at least tRF_OFF.

The intention of the state transition method is that only one ST25DVxxx 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.

7.4.3

Modes

The term “mode” refers to the mechanism used in a request to specify the set of ST25DVxxx devices that shall

execute the request.

ST25DV04K ST25DV16K ST25DV64K

RF protocol description

DS10925 - Rev 11

page 74/197

ST25DV64K Scheda tecnica(PDF) 74 Page - STMicroelectronics

ST25DV64K Scheda tecnica(HTML) 74 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL