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MRF24J40MB

1.0 DEVICE OVERVIEW

The MRF24J40MB is a 2.4 GHz IEEE Std. 802.15.4™

compliant, surface mount module with integrated

crystal, internal voltage regulator, matching circuitry,

Power Amplifier, Low Noise Amplifier and PCB

antenna. The MRF24J40MB module operates in the

non-licensed 2.4 GHz frequency band. The integrated

module design frees the integrator from extensive RF

and antenna design, and regulatory compliance

testing, allowing quicker time to market.

The MRF24J40MB module is compatible with

Microchip’s ZigBee

, MiWi™ and MiWi P2P software

stacks. Each software stack is available as a free

download, including source code, from the Microchip

web site: http://www.microchip.com/wireless.

The MRF24J40MB module has received regulatory

approvals for modular devices in the United States

(FCC), Canada (IC) and Europe (ETSI). Modular

approval removes the need for expensive RF and

antenna design, and allows the end user to place the

MRF24J40MB module inside a finished product and

not require regulatory testing for an intentional radiator

(RF transmitter).

1.1 Interface Description

Figure 1-1 shows a simplified block diagram of the

MRF24J40MB module. The module is based on the

Microchip Technology MRF24J40 IEEE 802.15.4™

2.4 GHz RF Transceiver IC. The module interfaces to

many popular Microchip PIC

microcontrollers via a

4-wire serial SPI interface, interrupt, wake, Reset,

power and ground, as shown in Figure 1-2. Table 1-1

provides the pin descriptions.

Data communications with the MRF24J40MB module

are documented in the “MRF24J40 IEEE 802.15.4™

2.4 GHz RF Transceiver Data Sheet” (DS39776). Refer

to the MRF24J40 Data Sheet for specific serial

interface protocol and register definitions.

FIGURE 1-1: MRF24J40MB BLOCK DIAGRAM

Note: See Section 3.0 “Regulatory Approval”

for specific requirements to be followed by

the integrator.

PCB

Antenna

Physical

MAC

Interface

Power

Management

SPI

20 MHz

Crystal

Digital

I/O

Power

MRF24J40MB IEEE Std. 802.15.4™ Module

MRF24J40

LNA