AN230 Datasheet, PDF (39/42 Pages) Silicon Laboratories – Device initialization sequence and busmode selection

AN230
Seek Results Comparisons
Figure 19 compares Silicon Laboratories field trials with existing and new seek parameters. The graph illustrates
that by setting the RSSI seek threshold at 25, invalid channels are not detected; however several valid stations are
missed. Conversely, with the RSSI threshold at 12, several invalid stations are identified. With the new optional
qualifiers enabled with the RSSI threshold at 12, the invalid stations are rejected and valid stations are reliably
identified.
45
94.7
90.5
93.7
40
102.3
89.5
35
30
88.7
25
20
Invalid station
rejected by SNR
and CNT
95.5
98.1
96.7
100.7
101.5
Valid stations missed with
SEEKTH at 25
103.5
105.9
93.3
15
98.9
107.1
104.9
10
5
0
87.5
Invalid stations
rejected by SNR
and CNT
92.5
RSSI Sweep
Invalid Channels SEEKTH=12
97.5
Channel Frequency
SEEKTH=12,CNT=8,SNR=4
Valid Stations SEEKTH=25
102.5
Valid Stations SEEKTH=12
107.5
Figure 19. Seek Results Comparison
Rev. 0.9
39