原标题：Microchip MRF24WB0M 2.4GHz Wi-Fi收发方案

　　Microchip 公司的MRF24WB0MA和MRF24WB0MB是低功耗 2.4GHz IEEE Std. 802.11兼容的Wi-Fi收发模块，包括所有的RF元件如晶振，旁路和带MAC的偏压电路，基带，RF和功率放大器，内支硬件支持AES和TKIP (WEP, WPA, WPA2 安全加密).模块工作电压2.7V-3.6V，工作频率为ISM频段2.400-2.483.5 GHz，14路可选择，DSSS调制，数据速率1000kbps，1Mbps的灵敏度为-91dBm，典型输出功率为+10dBm，主要用在智能仪表，白色家电，消费类电子，工业控制，遥控设备管理，以及零售设备和医疗保健设备。本文介绍了MRF24WB0MA和MRF24WB0MB主要特性，方框图，和微控制器接口以及典型应用电路。

　　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 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 tasksand 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.

　　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 (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 Standard802.11 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.

　　MRF24WB0MA /B主要特性：

　　•IEEE Std. 802.11-compliant RF Transceiver

　　•Serialized unique MAC address

　　•Data Rate: 1 and 2 Mbps

　　•IEEE Std. 802.11b/g/n compatible

　　•Small size: 21mm x 31mm 36-pin Surface Mount Module

　　•Integrated PCB antenna (MRF24WB0MA)

　　•External antenna option (MRF24WB0MB) with ultra miniature coaxial (U.FL) connector

　　•Range: up to 400m (1300 ft.)

　　•Easy integration into final product – accelerates product development, provides quicker time to market

　　•Radio regulation certification for United States (FCC), Canada (IC), Europe (ETSI) and Japan (ARIB)

　　•Wi-Fi® certified (WFA ID: WFA7150)

　　•Designed for use with Microchip microcontroller families (PIC18, PIC24, dsPIC33, and PIC32) with downloadable Microchip TCP/IP Stack

　　Operational:

　　•Single operating voltage: 2.7V-3.6V (3.3V typical)

　　•Temperature Range: 0℃ to +70℃ Commercial

　　•Simple, four-wire SPI interface with interrupt

　　•Low-current consumption:

　　-RX mode – 85 mA (typical)

　　-TX mode – 154 mA (+10 dBm typical)

　　-Sleep – 250 μA (typical)

　　-Hibernate – <0.1 μA (typical)

　　RF/Analog Features:

　　•ISM Band 2.400-2.483.5 GHz operation

　　•14 Channels selectable individually or domain-restricted

　　•DSSS Modulation

　　•Data Rate – 1000 kbps

　　•-91 dBm Typical sensitivity at 1 Mbps

　　•+10 dBm Typical output power with control

　　•Integrated low phase noise VCO, RF frequency synthesizer, PLL loop filter and PA

　　•Digital VCO and filter calibration

　　•Integrated RSSI ADC and I/Q DACs, RSSI readings available to host

　　•Balanced receiver and transmitter characteristics for low power consumption

　　MAC/Baseband Features:

　　•Hardware CSMA/CA access control, automatic ACK, and FCS creation and checking

　　•Automatic MAC packet retransmit

　　•Hardware Security Engine for AES and RC4-based ciphers

　　•Supports 802.1x, 802.1i security: WEP, WPA-PSK, and WPA-2-PSK.

　　MRF24WB0MA /B主要应用：

　　•Utility and Smart Energy

　　-Thermostats

　　-Smart Meters

　　-White Goods

　　-HVAC

　　•Consumer Electronics

　　-Remote Control

　　-Internet Radio

　　-Home Security

　　-Toys

　　•Industrial Controls

　　-Chemical Sensors

　　-HVAC

　　-Security Systems

　　-M2M Communication

　　•Remote Device Management

　　-Location and Asset Tracking

　　-Automotive

　　-Code Update

　　•Retail

　　-POS Terminals

　　-Wireless Price Tags

　　-Digital Remote

　　•Medical, Fitness, and Healthcare

　　-Glucose Meters

　　-Fitness Equipment

　　-Patient Asset Tracking

　　图1。MRF24WB0MA /B方框图

　　图2。MRF24WB0MA /B和微控制器接口框图

　　图3。MRF24WB0MA /B应用电路图