MRF24XA_15 Datasheet, PDF (209/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
9.5 Energy Detection
The Received Signal Strength Indicator (RSSI) is an
estimate of the received signal power within the band-
width of a particular channel, and obtained by the user
using Energy Detection (ED). MRF24XA has the capa-
bility to measure the received signal power for a user-
defined number of symbols, and to report back the
measured RSSI value.
The mapping between the RSSI value returned and the
input power level is shown in Figure 9-4. This
aggregates all the AGC curves, hence user does not
require to calculate with any other settings. The curve
is directly used.
The RSSI value associated with a received packet may
also be automatically stored as part of the packet’s
Receive Status Vector (RSV).
FIGURE 9-4:
RSSI VALUE VS. RECEIVED POWER
EQUATION 9-1:
RSSI VALUE VS. RECEIVED POWER EQUATION
Pin = 0.5 * Energy Detect Code⁽¹⁾ - 112 <dBm>⁽²⁾
Note 1: Energy Detect Code is read from EDMEAN<7:0> field.
2: Equation 9-1 is valid for EDMEAN<7:0> from 40 to 184 decimal values.
 2015 Microchip Technology Inc.
Preliminary
DS70005023C-page 209