A N 5 4 3
244
Rev. 0.9
Property 0x2004 AM_VALID_RSSI_THRESHOLD
The AM_VALID_RSSI_THRESHOLD property sets the RSSI threshold for a valid AM Seek/Tune. If the desired
channel RSSI is above this threshold, then it is considered valid. 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: 10
Units: dBµV
Property 0x200C AM_VALID_FREQOFF_SCALE
The AM_VALID_FREQOFF_SCALE sets the units in Hz for the AM_RSQ_STATUS response FREQOFF metric, as
well as AM_VALID_MAX_TUNE_ERROR. (For example, if AM_VALID_FREQOFF_SCALE is set to 100, then
AM_VALID_MAX_TUNE_ERROR will have units of 100 Hz per property value step.) The default is to use units of
binary ppm instead of any number of Hz. 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. In Si475x-A30 and earlier, FREQOFF is always
in units of bppm (binary ppm, or 2 ppm).
Si475x-A30 and earlier: This property is not available.
Si475x-A40 and later, Default: 0
Units: Hz
AM_VALID_RSSI_THRESHOLD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x00
AMVALRSSI[7:0]
0x00
0x0A
Bit
Name
Function
15:8
Reserved
Write 0 for (+) values, 0xFF for (–) values.
7:0
AMVALRSSI[7:0]
Sets the RSSI threshold for a valid AM Seek/Tune. Default is 10 dBµV.
Range is –128 to 127 in steps of 1 dB.
–128 = RSSI is not used as a criterion in determining the validity of a station.
AM_VALID_FREQOFF_SCALE
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SCALE[15:0]
0x0000
Bit
Name
Function
15:0
SCALE[15:0]
Sets the units in Hz for the frequency offset metric and the AM_VALID_MAX-
_TUNE_ERROR. The recommended value for AM is 50 Hz.
Default is 0.
0 = Use units of bppm.
