Silicon Laboratories Si4704 Series Programming Manual page 54

AN332
Table 9. FM/RDS Receiver Property Summary (Continued)
Prop Name
FM_SEEK_BAND_
0x1400
BOTTOM
0x1401 FM_SEEK_BAND_TOP
FM_SEEK_FREQ_
0x1402
SPACING
FM_SEEK_TUNE_
0x1403
SNR_THRESHOLD
FM_SEEK_TUNE_
0x1404
RSSI_TRESHOLD
0x1500 RDS_INT_SOURCE
RDS_INT_FIFO_
0x1501
COUNT
0x1502 RDS_CONFIG
0x1503 FM_RDS_CONFIDENCE
FM_BLEND_RSSI_
0x1800
STEREO_THRESHOLD
FM_BLEND_RSSI_MONO_
0x1801
THRESHOLD
FM_BLEND_RSSI_
0x1802
ATTACK_RATE
FM_BLEND_RSSI_
0x1803
RELEASE_RATE
FM_BLEND_SNR_
0x1804
STEREO_THRESHOLD
FM_BLEND_SNR_MONO_
0x1805
THRESHOLD
Notes:
1. Digital Audio Output feature (property DIGITAL_OUTPUT_FORMAT and DIGITAL_OUTPUT_SAMPLE_RATE) is
supported in FMRX component 2.0 or higher. Digital Audio Output featured is not supported on Si4741 FMRX component
2A.7.
2. RDS feature (command FM_RDS_STATUS and property RDS_INT_SOURCE, RDS_INT_FIFO_COUNT, and
RDS_CONFIG) is supported in FMRX component 2.0 or higher.
54
Sets the bottom of the FM band for seek.
Default is 8750 (87.5 MHz).
Sets the top of the FM band for seek.
Default is 10790 (107.9 MHz).
Selects frequency spacing for FM seek.
Default value is 10 (100 kHz).
Sets the SNR threshold for a valid FM Seek/Tune.
Default value is 3 dB.
Sets the RSSI threshold for a valid FM Seek/Tune.
Default value is 20 dBµV.
Configures RDS interrupt behavior
2
(Si4705/06/21/31/35/37/39/41/49 only).
Sets the minimum number of RDS groups stored in the receive
FIFO required before RDSRECV is set
2
(Si4705/06/21/31/35/37/39/41/49 only).
2
Configures RDS setting (Si4705/06/21/31/35/37/39/41/49 only).
Sets the confidence level threshold for each RDS block
(Si4706/49 only).
Sets RSSI threshold for stereo blend (Full stereo above threshold,
blend below threshold). To force stereo, set this to 0. To force
mono, set this to 127. Default value is 49 dBμV. (Si4740/41 Only)
Sets RSSI threshold for mono blend (Full mono below threshold,
blend above threshold). To force stereo, set this to 0. To force
mono, set this to 127. Default value is 30 dBμV. (Si4740/41 Only)
Sets the stereo to mono attack rate for RSSI based blend.
Smaller values provide slower attack and larger values provide
faster attack. The default is 1000 (approximately 33 ms for 63%
change). (Si4740/41 Only)
Sets the mono to stereo release rate for RSSI based blend.
Smaller values provide slower release and larger values provide
faster release. The default is 100 (approximately 330 ms for 63%
change). (Si4740/41 Only)
Sets SNR threshold for stereo blend (Full stereo above threshold,
blend below threshold). To force stereo, set this to 0. To force
mono, set this to 127. Default value is 30 dB. (Si4740/41 Only)
Sets SNR threshold for mono blend (Full mono below threshold,
blend above threshold). To force stereo, set this to 0. To force
mono, set this to 127. Default value is 10 dB. (Si4740/41 Only)
NOTE: With FW 2Ab7, suggest reprogramming to 14 dB. Default
is changing to 14 dB on next FW revision.
Confidential Rev. 0.2
Description Default
0x222E
0x2A26
0x000A
0x0003
0x0014
0x0000
0x0000
0x0000
0x1111
0x0031
0x001E
0x03E8
0x0064
0x001E
0x000A