SI4730-C40-GM Datasheet, PDF (27/42 Pages) Silicon Laboratories – BROADCAST AM/FM RADIO RECEIVER

Si4730/31-C40
Table 15. Selected Si473x Properties
Prop
Name
Description
Default
0x1100
FM_DEEMPHASIS
Sets de-emphasis time constant. Default is 75 µs.
0x0002
0x1105
FM_BLEND_STEREO_
THRESHOLD
Sets RSSI threshold for stereo blend (full stereo above
threshold, blend below threshold). To force stereo set this to 0. 0x0031
To force mono set this to 127. Default value is 49 dBµV.
0x1106
FM_BLEND_MONO_
THRESHOLD
Sets RSSI threshold for mono blend (full mono below threshold,
blend above threshold). To force stereo, set this to 0. To force 0x001E
mono, set this to 127. Default value is 30 dBµV.
0x1200
FM_RSQ_INT_
SOURCE
Configures interrupt related to RSQ metrics.
0x0000
0x1300
FM_SOFT_MUTE_RATE
Sets the attack and decay rates when entering and leaving soft
mute.
0x0040
0x1302
FM_SOFT_MUTE_
MAX_ATTENUATION
Sets maximum attenuation during soft mute (dB). Set to 0 to
disable soft mute. Default is 16 dB.
0x0010
0x1303
FM_SOFT_MUTE_
SNR_THRESHOLD
Sets SNR threshold to engage soft mute. Default is 4 dB.
0x0004
0x1400
FM_SEEK_BAND_
BOTTOM
Sets the bottom of the FM band for seek. Default is 8750.
0x222E
0x1401 FM_SEEK_BAND_TOP Sets the top of the FM band for seek. Default is 10790.
0x2A26
0x1402
FM_SEEK_FREQ_
SPACING
Selects frequency spacing for FM seek.
0x000A
0x1403
FM_SEEK_TUNE_
SNR_THRESHOLD
Sets the SNR threshold for a valid FM Seek/Tune. Default value
is 3 dB.
0x0003
0x1404
FM_SEEK_TUNE_
RSSI_TRESHOLD
Sets the RSSI threshold for a valid FM Seek/Tune. Default
value is 20 dBuV.
0x0014
0x1500
RDS_INT_SOURCE
Configures RDS interrupt behavior.
0x0000
0x1501
RDS_INT_FIFO_COUNT
Sets the minimum number of RDS groups stored in the receive
RDS FIFO required before RDS RECV is set.
0x0000
0x1502
RDS_CONFIG
Configures RDS setting.
0x0000
0x3100
AM_DEEMPHASIS
Sets de-emphasis time constant. Can be set to 50 us. De-
emphasis is disabled by default.
0x0000
0x3102
AM_CHANNEL_FILTER
Selects the bandwidth of the channel filter for AM reception. The
choices are 6, 4, 3, 2.5, 2, 1.8, or 1 kHz. In addition, a power
line rejection filter can be applied. The default is the 2 kHz band-
0x0003
width filter without power line rejection.
0x3103
AM_AUTOMATIC_VOLUME_
CONTROL_MAX_GAIN
Selects the maximum gain for automatic volume control.
0x1543
0x3200
0x3300
0x3302
0x3303
0x3400
AM_RSQ_INTERRUPTS
AM_SOFT_MUTE_RATE
AM_SOFT_MUTE_MAX_
ATTENUATION
AM_SOFT_MUTE_SNR_
THRESHOLD
AM_SEEK_BAND_
BOTTOM
Configures interrupt related to RSQ metrics. All interrupts are
disabled by default.
Sets the rate of attack when entering or leaving soft mute. The
default is 278 dB/s.
0x0000
0x0040
Sets maximum attenuation during soft mute (dB).
0x0008
Sets SNR threshold to engage soft mute. Default is 0 dB, which
disables soft mute.
0x0008
Sets the bottom of the AM band for seek. Default is 520.
0x0208
Rev. 1.0
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