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ST25DV04K Datenblatt(PDF) 31 Page - STMicroelectronics

Teilenummer ST25DV04K
Bauteilbeschribung  Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM, and fast transfer mode capability
PDF  200 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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ST25DV04K Datenblatt(HTML) 31 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, field change are not reported on GPO, even if FIELD_CHANGE
event is activated, as shown in Table 22. FIELD_CHANGE when RF is disabled or in sleep mode.
Table 22. FIELD_CHANGE when RF is disabled or in sleep mode
RF_DISABLE
RF_SLEEP
GPO behaviour when FIELD_CHANGE is enabled
0
0
A pulse is emitted on GPO if RF field appears or disappears (1)
1
0
X
1
GPO remains High-Z (OD) or tied low (CMOS)
IT_STS_Dyn register is not updated.
X
1
1. assuming that GPO output is enabled (GPO_EN = 1).
Figure 15. FIELD_CHANGE chronogram
2) RF field disappears and ST25DV is powered through VCC. GPO/FIELD_CHANGE generates a
pulse during IT_TIME.
GPO/FIELD_CHANGE (OD)
1) RF field appears. GPO/FIELD_CHANGE generates a pulse during IT_TIME.
t1
GPO/FIELD_CHANGE (OD)
S
O
F
E
O
F
ST25DV
reply
S
O
F
First VCD
command
E
O
F
3) RF field disappears and ST25DV is not powered through VCC. GPO/FIELD_CHANGE doesn’t
generates any pulse.
RF field
RF field
t1
S
O
F
E
O
F
ST25DV
reply
S
O
F
VCD
command
E
O
F
GPO/FIELD_CHANGE (OD)
RF field
t1
S
O
F
E
O
F
ST25DV
reply
S
O
F
VCD
command
E
O
F
ST25DV04K ST25DV16K ST25DV64K
GPO
DS10925 - Rev 9
page 31/200



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