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ST25DV04K Datasheet(PDF) 101 Page - STMicroelectronics

Part # ST25DV04K
Description  Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM,and fast transfer mode capability
PDF  220 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25DV04K Datasheet(HTML) 101 Page - STMicroelectronics

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ST25DV04K ST25DV16K ST25DV64K
RF operations
219
7.4.2
ST25DVxxx states referring to RF protocol
The ST25DVxxx can be in one of four states:
•
Power-off
•
Ready
•
Quiet
•
Selected
Transitions between these states are specified in Figure 33: ST25DVxxx state transition
diagram and Table 55: ST25DVxxx response depending on Request_flags.
Power-off state
The ST25DVxxx is in the Power-off state when it does not receive enough energy from the
VCD.
Ready state
The ST25DVxxx is in the Ready state when it receives enough energy from the VCD. When
in the Ready state, the ST25DVxxx answers any request where the Select_flag is not set.
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
Figure 32. ST25DVxxx protocol timing
VCD
Request
frame
Request
frame
ST25DVx
xx
Response
frame
Response
frame
Timing
<-t1->
<-t2->
<-t1->
<-t2->



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