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ST25R3911B Datasheet(PDF) 85 Page - STMicroelectronics

Part # ST25R3911B
Description  High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT
PDF  116 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3911B Datasheet(HTML) 85 Page - STMicroelectronics

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1.3.44
RSSI display register
Address: 2Ch
Type: R
Table 73. RSSI display register
Bit
Name
Default
Function
Comments(1)(2)
7
rssi_am_3
-
AM channel RSSI peak value. Refer to
Table 74. RSSI for definition.
Stores peak value of AM channel RSSI measurement.
Automatically cleared at beginning of transponder
message and with Clear RSSI command.
6
rssi_am_2
-
5
rssi_am_1
-
4
rssi_am_0
-
3
rssi_pm_3
-
PM channel RSSI peak value. Refer to
Table 74. RSSI for definition.
Stores peak value of PM channel RSSI measurement.
Automatically cleared at beginning of transponder
message and with Clear RSSI command.
2
rssi_pm_2
-
1
rssi_pm_1
-
0
rssi_pm_0
-
1. At power-up and after Set Default command content of this register is set to 0.
2. Bit 0x30[7] indicates which RSSI value is use in the logic for internal use.
Table 74. RSSI
rssi_3
rssi_2
rssi_1
rssi_0
Typical signal on RFI1 (mVrms)
0
0
0
0
≤20
0
0
0
1
>20
0
0
1
0
>27
0
0
1
1
>37
0
1
0
0
>52
0
1
0
1
>72
0
1
1
0
>99
0
1
1
1
>136
1
0
0
0
>190
1
0
0
1
>262
1
0
1
0
>357
1
0
1
1
>500
1
1
0
0
>686
1
1
0
1
>950
1
1
1
0
>1150
1
1
1
1
ST25R3911B
Registers
DS11793 - Rev 6
page 85/116



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