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MRF24J40MB
1.3
1.3.1
Operation
PA/LNA CONTROL
The internal RF state machine is configured for the PA/
LNA mode by setting TESTMODE (0x22F<2:0>) = 111 .
Pins, GPIO1 and GPIO2, then control the RF switches,
Operation of the Power Amplifier (PA) IC3 and Low Noise
Amplifier (LNA) IC5 is controlled by the MRF24J40
PA and LNA automatically when the MRF24J40
receives and transmits data.
internal RF state machine via RF switches, IC2 and IC4,
and the GPIO1 and GPIO2 pins on the MRF24J40.
Note:
A complete explanation of the operation of
the PA/LNA control is documented in the
Figure 1-6 shows the PA/LNA block diagram. Figure 2-1
“MRF24J40 Data Sheet”
(DS39776),
is the schematic diagram for the module.
Section 4.2 “External PA/LNA Control” .
FIGURE 1-6:
PCB
Antenna
PA/LNA BLOCK DIAGRAM
RF Switch
RF Switch
AS179-92
LNA
uPC8233TK
LNA
AS179-92
Balun
RFP
RFN
PA
V1 V2
PA
V1 V2
PA2423L
GPIO1
GPIO2
MRF24J40
1.3.2
ENERGY DETECTION (ED)
1.3.3
SLEEP
Before performing an energy detection (see
Section 3.6.1 “RSSI Firmware Request (RSSI
Mode 1)” in the “MRF24J40 Data Sheet” (DS39776)),
perform the following steps:
To get the lowest power consumption from the
MRF24J40MB module during Sleep, it is necessary to
disable both the PA and LNA. To do this, perform the
following steps:
1.
2.
Configure the internal RF state machine to normal
operation (TESTMODE (0x22F<2:0>) = 000 ).
Configure GPIO2 and GPIO1 direction for the
output (TRISGP2 (0x34<2>) = 1 and TRISGP1
(0x34<1>) = 1 ).
1.
2.
Configure the internal RF state machine to normal
operation (TESTMODE (0x22F<2:0>) = 000 ).
Configure the GPIO2 and GPIO1 direction for
output (TRISGP2 (0x34<2>) = 1 and TRISGP1
(0x34<1>) = 1 ).
3.
Set GPIO2 (0x33<2>) =
1
and GPIO1
3.
Set GPIO2 (0x33<2>) =
0
and GPIO1
(0x32<1>) = 0 . This enables the LNA and
(0x32<1>) = 0 . This disables the LNA and the PA.
disables the PA.
4.
Put the MRF24J40 to Sleep following the steps
4.
Perform the energy detection following the steps
in Section 3.6.1 “RSSI Firmware Request
(RSSI Mode 1) ” in the “MRF24J40 Data Sheet”
(DS39776).
Note:
The LNA will amplify the received signal.
The RSSI value will include the receive
signal strength plus the LNA amplification.
in the “MRF24J40 Data Sheet” (DS39776).
When waking the module, re-enable the PA/LNA mode.
? 2009 Microchip Technology Inc.
Preliminary
DS70599B-page 7
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