AN543
Rev. 0.9
175
Property 0x3603 FM_HICUT_RSSI_RELEASE_TIME
The FM_HICUT_RSSI_RELEASE_TIME property sets the transition time for which the HICUT mitigation engine
increases the cutoff frequency based on RSSI. 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.
Default: 4000
Units: ms
Property 0x3608 FM_HICUT_MULTIPATH_THRESHOLDS
The FM_HICUT_MULTIPATH_THRESHOLDS property sets the Multipath thresholds for HICUT to begin
band limiting and reach maximum band limiting on L+R channel based on max and min cutoff frequencies
(set by Property 0x3609) on the HICUT engine. 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-A40 and earlier, Default: 0x3250
Si475x/5xC-A55, Default: 0x0A14
Unit: %
FM_HICUT_RSSI_RELEASE_TIME
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RELEASE[15:0]
0x0FA0
Bit
Name
Function
15:0
RELEASE[15:0]
Sets the transition time for which the HICUT mitigation engine increases
the cutoff frequency based on RSSI.
Default is 4000 ms. Range is 1–32767 ms.
FM_HICUT_MULTIPATH_THRESHOLDS
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MULTMIN[7:0]
MULTMAX[7:0]
0x0A
0x14
Bit
Name
Function
15:8
MULTMIN[7:0]
Sets the Multipath level at which HICUT reaches max band limiting on the
L+R channel based on cutoff frequency set by property 0x3609.
Si475x/5xC-A55, Default is 10. Range is
0
–127%.
7:0
MULTMAX[7:0]
Sets the Multipath level at which HICUT begins to band limit on the L+R
channel based on cutoff frequency set by property 0x3609.
Si475x/5xC-A55, Default is 20. Range is
0
–127%.
