Rainbow Electronics RC1090 - Manual (Page 10)

RC1040/1080/1090
 2005 Radiocrafts AS RC1040/RC1080/RC1090 Data Sheet (rev. 1.3) Page 10 of 17
RSSI Output
The module provides an analogue Received Signal Strength Indicator (RSSI) signal at pin 19.
This pin can be connected to an ADC to measure the received signal strength. The signal
strength can be used as an indication of fading margin, or as a carrier sense signal to avoid
collisions.
The RSSI voltage decreases with increased input signal strength. Typical RSSI voltage as a
function of input signal strength is shown in the figure below.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
-105 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50
dBm
V
ol
ta
ge
433Mhz
868Mhz