CC1110Fx / CC1111Fx
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Input Power [dBm]
1.2 kBaud
38.4 kBaud
250 kBaud
Figure 52: Typical RSSI Value vs. Input Power Level for Different Data Rates at 433 MHz
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Input Power [dBm]
1.2 kBaud
38.4 kBaud
250 kBaud
Figure 53: Typical RSSI Value vs. Input Power Level for Different Data Rates at 868 MHz
13.10.4 Carrier Sense (CS)
CS is asserted when the RSSI has
increased with a programmable number
of dB from one RSSI sample to the next,
and de-asserted when RSSI has
decreased with the same number of dB.
This setting is not dependent on the
absolute signal level and is thus useful
to detect signals in environments with a
time varying noise floor.
The Carrier Sense (CS) flag is used as a sync
word qualifier and for CCA. The CS flag can be
set based on two conditions, which can be
individually adjusted:
CS is asserted when the RSSI is above
a programmable absolute threshold, and
de-asserted when RSSI is below the
same threshold (with hysteresis).
SWRS033H
Page 199 of 246
TI [ TEXAS INSTRUMENTS ]
