AN543
Rev. 0.9
157
Property 0x3208 FM_POP_NOISE_RSSI_THRESHOLDS (Si4754/55/56/57 Only)
The FM_POP_NOISE_RSSI_THERSHOLDS property sets the change in RSSI thresholds for maximum and
minimum MPX limiting (set by property 0x3209). 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 the powerup mode.
Si475x-A10: This property is not available.
Si475x-A20/A30/A40, Default: 0xECE7
Si475x/5xC-A55, Default: 0xFDF9
Property 0x3209 FM_POP_NOISE_RSSI_MPX_LIMIT (Si4754/55/56/57 Only)
Th
e FM_POP_NOISE_RSSI_MPX_LIMIT property sets the minimum and maximum limit for MPX limiter based on
change in RSSI. To force a given setting (i
.
e
.
either completely on or completely off) set YMIN = YMAX. To disable
the
MPX limiter based on change in RSSI, set YMIN = YMAX = 127
.
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 the powerup mode
.
Si475x
-
A10:
This property is not available.
Si475x
-
A
20/A30/A40
,
Default: 0x1
0
09
Si475x/5xC-A55, Default: 0x0502
FM_POP_NOISE_RSSI_THRESHOLDS
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
XMAX[7:0]
XMIN[7:0]
0xFD
0xF9
Bit
Name
Function
15:8
XMAX[7:0]
Sets the maximum change in RSSI threshold. If the change in RSSI is above this
threshold maximum MPX limiting will be achieved as set by property 0x3209.
Range is –127 to 127 (dB).
7:0
XMIN[7:0]
Sets the minimum change in RSSI threshold. If the change in RSSI is below this
threshold minimum MPX limiting will be achieved as set by property 0x3209.
Range is –127 to 127 (dB).
FM_POP_NOISE_RSSI_MPX_LIMIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
YMAX[7:0]
YMIN[7:0]
0x05
0x02
Bit
Name
Function
15:8
YMAX[7:0]
Sets the upper limit. Si475x/5xC-A55, Default: 0x05. Range
0
–127.
7:0
YMIN[7:0]
Sets the lower limit. Si475x/5xC-A55, Default: 0x02. Range
0
–127.
