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ST25DV04K Datasheet(PDF) 76 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 76 Page - STMicroelectronics |
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76 / 200 page  Quiet state When in the Quiet state, the ST25DVxxx answers any request with the Address_flag set, except for Inventory requests. 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 1 Addressed 0 Non addressed 1 Selected 0 Non selected ST25DVxxx in Ready or Selected state (Devices in Quiet state do not answer) - X - X ST25DVxxx in Selected state - X X - ST25DVxxx in Ready, Quiet or Selected state (the device which matches the UID) X - - X Error (03h) or no response (command dependent) X - X - 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 1. 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. ST25DV04K ST25DV16K ST25DV64K RF protocol description DS10925 - Rev 9 page 76/200 |
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