SI4708-C Datasheet, PDF (25/40 Pages) Silicon Laboratories – BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS

Si4708/09-C
Register 05h. System Configuration 2
Bit D15 D14 D13 D12 D11 D10 D9
Name
SEEKTH[7:0]
Type
R/W
Reset value = 0x0000
D8 D7 D6 D5 D4 D3 D2 D1 D0
BAND[1:0] SPACE[1:0]
VOLUME[3:0]
R/W
R/W
R/W
Bit
Name
Function
15:8 SEEKTH[7:0] RSSI Seek Threshold.
0x00 = min RSSI (default).
0x7F = max RSSI.
SEEKTH presents the logarithmic RSSI threshold for the seek operation. The
Si4708/09 will not validate channels with RSSI below the SEEKTH value. SEEKTH is
one of multiple parameters that can be used to validate channels. For more informa-
tion, see "AN349: Si4708/09 Programming Guide."
7:6
BAND[1:0] Band Select.
00 = 87.5–108 MHz (US/Europe, Default).
01 = 76–108 MHz (Japan wide band).
10 = 76–90 MHz (Japan).
11 = Reserved.
5:4
SPACE[1:0] Channel Spacing.
00 = 200 kHz (USA, Australia) (default).
01 = 100 kHz (Europe, Japan).
10 = 50 kHz.
3:0 VOLUME[3:0] Volume.
Relative value of volume is shifted –30 dBFS with the VOLEXT 06h[8] bit.
VOLEXT = 0 (default).
0000 = mute (default).
0001 = –28 dBFS.
:
:
1110 = –2 dBFS.
1111 = 0 dBFS.
VOLEXT = 1.
0000 = mute.
0001 = –58 dBFS.
:
:
1110 = –32 dBFS.
1111 = –30 dBFS.
FS = full scale.
Volume scale is logarithmic.
Rev. 1.2
25