MRF24J40MD 데이터 시트보기 (PDF) - Microchip Technology

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MRF24J40MD

2.4 GHz IEEE Std. 802.15.4™ RF Transceiver Module with PA/LNA

Microchip Technology 

MRF24J40MD/ME

1.4.2 ENERGY DETECTION (ED)

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:

1. Configure the internal RF state machine to normal

operation (TESTMODE (0x22F<2:0>) = 000).

2. Configure GPIO2 and GPIO1 direction for

output (TRISGP2 (0x34<2>) = 1 and TRISGP1

(0x34<1>) = 1).

3. Set GPIO2 (0x33<2>) = 1 and GPIO1

(0x32<1>) = 0. This enables the LNA and

disables the PA.

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.

1.4.3 SLEEP

To get the lowest power consumption from the

MRF24J40MD/ME module during Sleep, it is neces-

sary to disable the PA, PA voltage regulator and LNA.

To do this, perform the following steps:

1. Configure the internal RF state machine to normal

operation (TESTMODE (0x22F<2:0>) = 000).

2. Configure the GPIO2, GPIO1 and GPIO0

direction for output (TRISGP2 (0x34<2>) = 1,

TRISGP1 (0x34<1>) = 1) = 1 and TRISGP0

(0x34<0>) = 1).

3. Set GPIO2 (0x33<2>) = 0 and GPIO1

(0x32<1>) = 0. This disables the LNA and the PA.

4. Put the MRF24J40 to Sleep following the steps

in the “MRF24J40 Data Sheet” (DS39776).

When waking the module, re-enable the PA/LNA Mode.

DS70005173A-page 8

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 2014 Microchip Technology Inc.

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