MRF24XA_15 Datasheet, PDF (225/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
9.10 Signal Detection (Power-Save
Listen Mode)
In Power-Save Listen Mode, only the RX front end cir-
cuit is powered, the baseband is switched off. In this
mode, approximately 3 mA receive current is saved. To
use this mode, set the PSAV bit to ‘1’.
Note:
In this mode, MRF24XA consumes less
current that causes sensitivity
degradation.
TABLE 9-8:
RECOMMENDED SETTINGS
FOR POWER-SAVE LISTEN
MODE
Thresholds
125/250/
Legacy
500
kbps
1 Mbps 2 Mbps
DesensThr
0x3
0x4
0x5
0x5
PsavThr
0x9
0xC
0xF
0xF
REGISTER 9-26: RATECON (RATE CONFIGURATION REGISTER)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
DIS2000
bit 7
DIS1000
DIS500
DIS250
DISSTD
DIS125
ADDRESS: 0x36
R/W-1
R/W-1
OPTIMAL
PSAV
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-1
bit 0
Out of scope.
PSAV: Power-Save Mode Selection bit
When this bit is set, frame detection is dependent on the RSSI signal, and the receive signal processor
is turned on when a sudden and significant increase (PSAVTHR<3:0>) is detected in the signal strength
or the signal strength is above an absolute level (DESENSTHR<3:0>).
1 = Power-Save mode
0 = Hi-Sensitivity mode
 2015 Microchip Technology Inc.
Preliminary
DS70005023C-page 225