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SI4713 Datasheet(PDF) 91 Page - Silicon Laboratories

Part # SI4713
Description  Si47XX PROGRAMMING GUIDE
PDF  302 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI4713 Datasheet(HTML) 91 Page - Silicon Laboratories

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AN332
Rev. 1.0
91
Property 0x1107. FM_ANTENNA_INPUT
Selects what type of antenna and what pin it is connected to. Default is 0 which means the antenna used is a
headphone (long) antenna and it is connected to the FMI pin. Setting the FMTXO bit to 1 means that the antenna
used is an embedded (short) antenna and it is connected to the TXO/LPI pin.
Note:
To assure proper tuning, the FM_TUNE_FREQ command should be issued immediately after this property is changed.
Available in: Si4704/05/06/20/21
Default: 0x0000
Property 0x1108. FM_MAX_TUNE_ERROR
Sets the maximum freq error allowed before setting the AFC rail indicator (AFCRL). The CTS bit (and optional
interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup
mode. The default is 20 kHz.
Note:
For FMRX components 2.0 or earlier, the default is set to 30 kHz. For best seek performance, set FM_MAX_TUNE_ER-
ROR to 20 kHz.
Available in: All
Default: 0x001E (Si473x-B20 and earlier)
0x0014 (all others)
Units: kHz
Step: 1
Range: 0–255
Bit
D15
D14
D13
D12
D11
D10
D9D8D7D6D5D4D3D2D1
D0
Name
000
000
000
000
000
FMTXO
Bit
Name
Function
15:1
Reserved
Always write to 0
0FMTXO
Selects what type of antenna and which pin it is connected to:
0 = Use FMI pin for headphone (long) antenna
1 = Use TXO/LPI pin for embedded (short) antenna
Bit
D15
D14
D13
D12
D11
D10
D9
D8D7D6
D5D4D3
D2D1D0
Name
0
000
000
0
FMMAXTUNEERR[7:0]
Bit
Name
Function
15:8
Reserved
Always write to 0.
7:0
FMMAXTUNEERR
FM Maximum Tuning Frequency Error.
Maximum tuning error allowed before setting the AFC Rail Indicator ON. Specified in
units of kHz. Default is 20 kHz.



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