MRF24WB0MB datasheet(5/38 Pages) MICROCHIP

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 2010-2013 Microchip Technology Inc.

DS70632C-page 5

MRF24WB0MA/MRF24WB0MB

1.0

DEVICES OVERVIEW

The MRF24WB0MA and MRF24WB0MB are low-power,

2.4

GHz,

IEEE

802.11-compliant,

surface

mount

modules with all associated RF components such as

crystal oscillator, bypass and bias passives with

integrated 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 has 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

Microchip Application Libraries for free download

(including 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 802.11 and IP

services. This allows 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

Figure 1-1

represents

MRF24WB0MA/

MRF24WB0MB module. It interfaces to Microchip

PIC18, PIC24, dsPIC33, or PIC32 microcontrollers

through a four-wire serial slave SPI interface, such as

interrupt, hibernate, Reset, power and ground signals.

The module runs on a single supply voltage of

nominally 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 connection

between a Microchip’s PIC MCU and the module.

Table 1-1 lists the pin descriptions.

Data

communications

with

the

MRF24WB0MA/

MRF24WB0MB are through the SPI interface, for

more information see Section 2.0, Circuit Descrip-

tion. Microchip’s PIC MCUs communicates with the

module through a command API within the Microchip

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

Microchip TCP/IP stack online help that is available in

the Microchip Application Libraries for free download.

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