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ST25R3916B Datasheet(PDF) 65 Page - STMicroelectronics

Part # ST25R3916B
Description  NFC reader for payment, consumer and industrial applications
PDF  165 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3916B Datasheet(HTML) 65 Page - STMicroelectronics

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Application information
164
Figure 30. Direct command NFC initial field ON
Figure 31. 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.
MS42450V1
TIDT
TIRFG
n x TRFW
Start
RF on
TRFW
MS42451V1
TADT
TARFG
n x TRFW
Start
RF on
TRFW
Table 15. 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>
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 …35 ms
Active delay time
TADT
768
/ fc
NFC response field ON
RF waiting time
TRFW
512
/ fc
n = 0…3 based on nfc_n<1:0> in Auxiliary
definition register
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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