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ST25R3920 Datasheet(PDF) 60 Page - STMicroelectronics

Part # ST25R3920
Description  Automotive high performance NFC reader for CCC digital key and car center console
PDF  152 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3920 Datasheet(HTML) 60 Page - STMicroelectronics

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ST25R3920
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DS13261 Rev 9
Figure 26. Direct command NFC initial field ON
Figure 27. Direct command NFC response field ON
4.4.6
Mask receive data and Unmask receive data
The direct command Mask receive data disables processing of the receiver output by the
RX decoders, RSSI measurement, and AGC operation.
The direct command Unmask receive data enables processing of the received data by the
RX decoders, RSSI measurement and AGC operation. A common use of this command is
to re-enable the receiver operation after it was masked by the command Mask receive data.
If the Mask receive timer is still running while the direct command Unmask receive data is
received, reception is enabled, and the Mask receive timer is reset.
MS42450V1
TIDT
TIRFG
n x TRFW
Start
RF on
TRFW
MS42451V1
TADT
TARFG
n x TRFW
Start
RF on
TRFW
Table 12. Timing parameters of NFC field ON commands
Parameter
Symbol
Value
Unit
Notes
Initial delay time
TIDT
4096
/ fc
NFC initial field ON
RF waiting time
TRFW
512
/ fc
n = 0 3 based on nfc_n<1:0> in Auxiliary
definition register
Initial guard time
TIRFG
75 µs +
NFC field on guard time
s
NFC field on guard time defined in the NFC field
on guard timer register.
NFCIP-1 TIRFG requirement: 5 to 35 ms
Active delay time
TADT
768
/ fc
NFC response field ON
Active guard time
TARFG
75 µs +
NFC field on guard time
s
NFC field ON guard time defined in the NFC
field on guard timer register.
NFCPIP-1 TARFG requirement:
> 75 µs + NFC field ON guard times (1024 / fc)



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