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ST25DV04KC Datasheet(PDF) 79 Page - STMicroelectronics

Part # ST25DV04KC
Description  Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM, fast transfer mode capability and optimized I2C
PDF  203 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25DV04KC Datasheet(HTML) 79 Page - STMicroelectronics

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Quiet state
When in the Quiet state, the ST25DVxxKC answers any request with the Address_flag set, except for Inventory
requests.
Selected state
In the Selected state, the ST25DVxxKC 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 95. ST25DVxxKC response depending on Request_flags
Flags
Address_flag
Select_flag
1
Addressed
0
Non addressed
1
Selected
0
Non selected
ST25DVxxKC in Ready or Selected
state (Devices in Quiet state do not
answer)
-
X
-
X
ST25DVxxKC in Selected state
-
X
X
-
ST25DVxxKC in Ready, Quiet or
Selected state (the device which
matches the UID)
X
-
-
X
Error (03h) or no response (command
dependent)
X
-
X
-
Figure 39. ST25DVxxKC 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 ST25DVxxKC 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 ST25DVxxKC should be in the Selected state at a
time.
ST25DV04KC ST25DV16KC ST25DV64KC
RF protocol description
DS13519 - Rev 3
page 79/203



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