AN543
Rev. 0.9
81
Property 0x0411 FM_SOFT_MUTE_ASSI200DEV_RELEASE_TIME
The FM_SOFT_MUTE_ASSI200DEV_RELEASE_TIME property sets maximum time in ms it takes to unmute the
audio. 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: This property is not available.
Si475x-A30 and later, Default: 256
Units: ms
Property 0x0700 FM_AGC_FE_CONFIG
The FM_AGC_FE_CONFIG property specifies the input path for the RF signal and other FE configuration options.
This property should only be set before the first tune. 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. Changes to this property take
effect after the next tune is completed.
Default: 0x0080
FM_SOFT_MUTE_ASSI200DEV_RELEASE_TIME
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RELEASE_ASSI200DEV[15:0]
0x0100
Bit
Name
Function
15:0
RELEASE_ASSI200DEV[15:0]
Sets the maximum time in ms it takes to unmute the audio.
Note that there will be 16 ms of filter delay for the ASSI200DEV
metric before softmute can engage/disengage.
Default is 256 ms. Range is 1–32767 ms.
FM_AGC_FE_CONFIG
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x00
FMLNAZ
1000
INPUTSELECT[3:0]
0x00
0
1000
0x0
Bit
Name
Function
15:9
Reserved
Always write 0.
8
FMLNAZ
0 = LNA input impedance is 50
.(Normal Operation)
1 = LNA input impedance is 100
(Loop-through mode: two receiv-
ers splitting a single antenna signal) (Si4754/55/56/57 only)
7:4
Reserved
Always write 1000.
3:0
INPUTSELECT[3:0]
0 = Received signal comes into FMI pin, out FMO and then the
mixer pin.
1 = Received signal comes directly into the mixer at the FMXIP/
FMIN pins.
