AN543
Rev. 0.9
79
Property 0x040D FM_SOFT_MUTE_USN_RELEASE_TIME
The FM_SOFT_MUTE_USN_RELEASE_TIME property sets maximum time in ms it takes to unmute the audio
based on USN. 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 in powerup mode.
Si475x-A20 and earlier, Si475x-A40 and later: This property is not available
Si475x-A30, Default: 0x0100
Units: ms
Property 0x040E FM_SOFT_MUTE_ASSI200DEV_LIMITS
The FM_SOFT_MUTE_ASSI200DEV_LIMITS property sets the ASSI200DEV threshold to engage softmute and
sets the ASSI200DEV threshold at which softmute attenuation will be set to its maximum value. 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 in
powerup mode.
Si475x-A10 and earlier: Range: 4–248 ms.
Si475x-A20 and later: Range is 4–4096 ms.
FM_SOFT_MUTE_USN_RELEASE_TIME
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RELEASE[15:0]
0x0004
Bit
Name
Function
15:0
RELEASE[15:0]
Sets the USN-based soft mute release time in ms. Note that
there will be 16 ms of filter delay for USN metric before softmute
can engage/disengage.
Default is 256.
Range is 1–32767.
FM_SOFT_MUTE_ASSI200DEV_LIMITS
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SMTRGTH_ASSI200DEV[7:0]
SMENDTH_ASSI200DEV[7:0]
0x33
0x5A
Bit
Name
Function
15:8
SMTRGTH_ASSI200DEV[7:0]
Sets the ASSI200DEV threshold to engage softmute. Default is
51. Range is 0 to 150.
7:0
SMENDTH_ASSI200DEV[7:0]
Sets the ASSI200DEV threshold at which softmute attenuation
will be set to its maximum value. Default is 90. Range is 0 to 150.
