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ST25DV04KC Datasheet(PDF) 37 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) 37 Page - STMicroelectronics

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FIELD_CHANGE:
•
A pulse is emitted on GPO to signal a change in RF field state.
•
When FIELD_CHANGE is activated, and when RF field appear or disappear, GPO emits a pulse of duration
IT_TIME.
•
In case of RF field disappear, the pulse is emitted only if VCC power supply is present.
•
If RF is configured in RF_SLEEP mode or is in RF_OFF state, field change are not reported on GPO, even if
FIELD_CHANGE event is activated, as shown in Table 28.
Table 28. FIELD_CHANGE when RF is disabled or in sleep of off mode
RF_DISABLE
RF_SLEEP
RF_OFF
GPO behaviour when FIELD_CHANGE is enabled
0
0
0
A pulse is emitted on GPO if RF field appears or disappears (1)
IT_STS_Dyn register is updated.
1
0
0
X
1
X
GPO remains High-Z (open drain version) or is tied to ground (CMOS version).
IT_STS_Dyn register is not updated.
X
X
1
1. assuming that GPO output is enabled (GPO_EN = 1).
Figure 20. FIELD_CHANGE chronogram
2) RF field disappears and ST25DVxxKC is powered through VCC. GPO/FIELD_CHANGE generates
a pulse during IT_TIME.
GPO/FIELD_CHANGE
1) RF field appears. GPO/FIELD_CHANGE generates a pulse during IT_TIME.
t1
GPO/FIELD_CHANGE
S
O
F
E
O
F
ST25DVxxKC
reply
S
O
F
First VCD
command
E
O
F
3) RF field disappears and ST25DVxxKC is not powered through VCC. GPO/FIELD_CHANGE doesn’t
generates any pulse.
RF field
RF field
t1
S
O
F
E
O
F
S
O
F
VCD
command
E
O
F
GPO/FIELD_CHANGE
RF field
t1
S
O
F
E
O
F
S
O
F
VCD
command
E
O
F
ST25DVxxKC
reply
ST25DVxxKC
reply
ST25DV04KC ST25DV16KC ST25DV64KC
GPO
DS13519 - Rev 3
page 37/203



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