Silicon Laboratories Si4704 Series Programming Manual page 91

Property 0x1302. FM_SOFT_MUTE_MAX_ATTENUATION (Not applicable for Si4749)
Sets maximum attenuation during soft mute (dB). Set to 0 to disable soft mute. The CTS bit (and optional interrupt)
is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The
default is 16 dB.
Default: 0x0010
Units: dB
Step: 1
Range: 0–31
Bit D15 D14 D13
Name 0 0
Bit Name
15:5 Reserved
4:0 SMATTN
Property 0x1303. FM_SOFT_MUTE_SNR_THRESHOLD (Not applicable for Si4749)
Sets SNR threshold to engage soft mute. Whenever the SNR for a tuned frequency drops below this threshold, the
FM reception will go in soft mute, provided soft mute max attenuation property is non-zero. The CTS bit (and
optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in
powerup mode. The default is 4 dB.
Default: 0x0004
Units: dB
Step: 1
Range: 0–15
Bit D15 D14 D13 D12
Name 0 0
Bit Name
15:4 Reserved
3:0 SMTHR
D12 D11 D10
0 0 0 0
Always write to 0.
FM Soft Mute Maximum Attenuation.
Set maximum attenuation during soft mute. If set to 0, then soft mute is disabled. Speci-
fied in units of dB in 1 dB steps (0–31). Default is 16 dB.
D11 D10
0 0 0 0
Always write to 0.
FM Soft Mute SNR Threshold.
Threshold which will engage soft mute if the SNR falls below this. Specified in units of dB
in 1 dB steps (0–15). Default is 4 dB.
Confidential Rev. 0.2
D9 D8 D7 D6
0 0 0 0
Function
D9 D8 D7 D6
0 0 0 0
Function
AN332
D5 D4 D3 D2
0 SMATTN[4:0]
D5 D4 D3 D2
0 0 SMTHR[3:0]
D1 D0
D1 D0
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