SI4708-C Datasheet, PDF (23/40 Pages) Silicon Laboratories – BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS

Si4708/09-C
Register 04h. System Configuration 1
Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Name ^{RDSIEN STCIEN 0 RDS DE AGCD 0}
0 BLNDADJ[1:0] 0
0
GPO[1:0]
0
0
Type ^R/W
R/W R/W R/W R/W R/W R/W R/W
R/W
R/W R/W
R/W
R/W R/W
Reset value = 0x0000
Bit
Name
Function
15
RDSIEN RDS Interrupt Enable (Si4709 only).
0 = Disable Interrupt (default).
1 = Enable Interrupt.
Setting RDSIEN = 1 and GPO[1:0] = 01 will generate a 5 ms low pulse on GPO when the
RDSR 0Ah[15] bit is set.
14
STCIEN Seek/Tune Complete Interrupt Enable.
0 = Disable Interrupt (default).
1 = Enable Interrupt.
Setting STCIEN = 1 and GPO[1:0] = 01 will generate a 5 ms low pulse on GPO when the
STC 0Ah[14] bit is set.
13 Reserved Always write to 0.
12
RDS
RDS Enable (Si4709 only).
0 = Disable (default).
1 = Enable.
11
DE
De-emphasis.
0 = 75 µs. Used in USA (default).
1 = 50 µs. Used in Europe, Australia, Japan.
10
AGCD AGC Disable.
0 = AGC enable (default).
1 = AGC disable.
9:8 Reserved Always write to 0.
7:6 BLNDADJ[1:0] Stereo/Mono Blend Level Adjustment.
Sets the RSSI range for stereo/mono blend.
00 = 31–49 RSSI dBµV (default).
01 = 37–55 RSSI dBµV (+6 dB).
10 = 19–37 RSSI dBµV (–12 dB).
11 = 25–43 RSSI dBµV (–6 dB).
ST bit set for RSSI values greater than low end of range.
5:4 Reserved Always write to 10.
Rev. 1.2
23