SI4736-B20 Datasheet, PDF (27/38 Pages) Silicon Laboratories – BROADCAST WEATHER BAND RADIO RECEIVER

Si4736/37/38/39-B20
Table 15. Si473x Property Summary (Continued)
Prop
0x1500
0x1501
0x1502
0x3100
0x3102
0x3200
0x3201
0x3202
0x3203
0x3204
0x3300
0x3301
0x3302
0x3303
0x3400
0x3401
0x3402
0x3403
0x3404
0x4000
0x4001
0x5108
Name
RDS_INT_SOURCE
RDS_INT_FIFO_COUNT
RDS_CONFIG
AM_DEEMPHASIS
AM_CHANNEL_FILTER
AM_RSQ_INTERRUPTS
AM_RSQ_SNR_HIGH_
THRESHOLD
AM_RSQ_SNR_LOW_
THRESHOLD
AM_RSQ_RSSI_HIGH_
THRESHOLD
AM_RSQ_RSSI_LOW_
THRESHOLD
AM_SOFT_MUTE_RATE
AM_SOFT_MUTE_SLOPE
AM_SOFT_MUTE_MAX_
ATTENUATION
AM_SOFT_MUTE_SNR_
THRESHOLD
AM_SEEK_BAND_
BOTTOM
AM_SEEK_BAND_TOP
AM_SEEK_FREQ_
SPACING
AM_SEEK_SNR_
THRESHOLD
AM_SEEK_RSSI_
THRESHOLD
RX_VOLUME
RX_HARD_MUTE
WB_MAX_TUNE_ERROR
Description
Configures RDS interrupt behavior.
Sets the minimum number of RDS groups stored in the receive
RDS FIFO required before RDS RECV is set.
Configures RDS setting.
Sets de-emphasis time constant. Can be set to 50 us. De-
emphasis is disabled by default.
Selects the bandwidth of the channel filter for AM reception. The
choices are 6, 4, 3, or 2 (kHz). The default bandwidth is 2 kHz.
Configures interrupt related to RSQ metrics. All interrupts are
disabled by default.
Default
0x0000
0x0000
0x0000
0x0000
0x0003
0x0000
Sets high threshold for SNR interrupt. The default is 0 dB.
0x0000
Sets low threshold for SNR interrupt. The default is 0 dB.
0x0000
Sets high threshold for RSSI interrupt. The default is 0 dB.
0x0000
Sets low threshold for RSSI interrupt. The default is 0 dB.
0x0000
Sets the rate of attack when entering or leaving soft mute. The
default is 278 dB/s.
0x0040
Sets the AM soft mute slope. The bigger the number, the higher
the max attenuation level. Default value is a slope of 2.
0x0002
Sets maximum attenuation during soft mute (dB). Set to 0 to dis-
able soft mute. Default is 16 dB.
0x0010
Sets SNR threshold to engage soft mute. Default is 10 dB.
0x000A
Sets the bottom of the AM band for seek. Default is 520.
0x0208
Sets the top of the AM band for seek. Firmware 1.0 incorrectly
defaults to 1721 kHz instead of 1710.
0x06AE
Selects frequency spacing for AM seek. Default is 10 kHz spac-
ing.
0x000A
Sets the SNR threshold for a valid AM Seek/Tune. If the value is
zero then SNR threshold is not considered when doing a seek. 0x0005
Default value is 5 dB.
Sets the RSSI threshold for a valid AM Seek/Tune. If the value
is zero then RSSI threshold is not considered when doing a
seek. Default value is 25 dBuV.
0x0019
Sets the output volume.
0x003F
Mutes the audio output. L and R audio outputs may be muted
independently in FM mode.
0x0000
Maximum change in frequencies from the WB_TUNE_FREQ to
which the AFC will lock.
0x000F
Rev. 1.0
27