MRF24WB0MASLASHRM datasheet(7/34 Pages) MICROCHIP

7 / 34 page

 2010 Microchip Technology Inc.

Preliminary

DS70632A-page 7

MRF24WB0MA/MRF24WB0MB

1.0

DEVICES OVERVIEW

The MRF24WB0MA and MRF24WB0MB are low-

power, 2.4 GHz, IEEE Std. 802.11-compliant, surface

mount modules with all associated RF components –

crystal oscillator, bypass and bias passives with inte-

grated MAC, baseband, RF and power amplifier, and

built-in hardware support for AES, and TKIP (WEP,

WPA, WPA2 security). The integrated module design

frees the designer from RF and antenna design tasks

and regulatory compliance testing, ultimately providing

quicker time to market.

The MRF24WB0MA module is approved for use with

the integrated PCB meander antenna.

The MRF24WB0MB comes with an ultra miniature

coaxial connector (U.FL) and is approved for use with

a list of pre-certified antennas. See Section 2.8

“External Antenna”, for specific recommendations.

The MRF24WB0MA/MRF24WB0MB modules are

designed to be used with Microchip’s TCP/IP software

stack. The software stack has an integrated driver that

implements the API that is used in the modules for

command and control, and for management and data

packet traffic.

The Microchip TCP/IP software stack is available in the

free Microchip Application Libraries download (includ-

ing example applications and source code) from the

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

The combination of the module and a PIC running the

TCP/IP stack results in support for IEEE Standard

802.11 and IP services. This allows, for example, the

immediate implementation of a wireless web server.

The MRF24WB0MA/MRF24WB0MB modules have

received regulatory approvals for modular devices in

the United States (FCC), Canada (IC), and Europe

(ETSI). The modular approval removes the need for

expensive RF and antenna design, and allows the end

user to place the modules inside a finished product and

not require regulatory testing for an intentional radiator

(RF transmitter). They also have Radio Type Approval

Certification for Japan. See Section 3.0 “Regulatory

Approval”, for the specific requirements that should be

adhered to by the integrator.

1.1

Interface Description

The block diagram in Figure 1-1 represents a

MRF24WB0MA/MRF24WB0MB module. It interfaces

to a Microchip PIC18, PIC24, dsPIC33, or PIC32 micro-

controllers via a four-wire serial slave SPI interface –

interrupt, hibernate, Reset, power and ground signals.

The module runs on a single supply voltage of nomi-

nally 3.3v. It also supports optional JTAG and serial

debug for testability. The debug port operates at 3.3v

and requires a level shifter for operation with RS-232

devices. Figure 1-2 shows a simplified example con-

nection between a Microchip PIC MCU and the mod-

ule. Table 1-1 lists the pin descriptions.

Data communications with the MRF24WB0MA/

MRF24WB0MB are through the SPI interface that is

detailed in Section 2.0 “Circuit Description”. The

Microchip PIC microcontroller communicates with the

module via a command API from within the Microchip

TCP/IP stack. The command API is detailed in the

Microchip TCP/IP Stack online help that is included in

the free Microchip Application Libraries download.

FIGURE 1-1:

MRF24WB0MA/MRF24WB0MB BLOCK DIAGRAM

SPI

Digital I/O

Power

Encryption

Interface

Power

Amplifier

RAM

ROM

FLASH

JTAG

Interrupt

Debug

Reset

Hibernate

Matching

Circuitry

PCB

Antenna

)

(MRF24WB0MA

2. 4 GHz IEEE Std. 802.11b RF Transceiver Module

MRF24WB0MA

Transceiver

2.4 GHz

Accelerator

AES TKIP

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