Atmel公司的AT86RF232是用于ZigBee, IEEE 802.15.4, 6LoWPAN, RF4CE以及ISM的2.4GHz低功耗收發器,是真正的SPI到天線解決方案.所有的RF元件,除了天線,晶體和去偶電容都集成在芯片中.接收器靈敏度為-100dBm,可編程輸出功率從-17dBm到+3dBm,超低工作電壓1.8V-3.6V(內部有穩壓器),睡眠模式電流為0.4uA,最大發射功率時的功耗為13.8mA,AES 128位硬件加速器.本文介紹了AT86RF232主要特性,方框圖, 接收器和發送器方框圖, 基本應用電路圖及其材料清單, 擴展特性應用電路圖和REB232ED-EK評估板主要特性,電路圖,材料清單和PCB布局圖.

The Atmel AT86RF232 is a low-power 2.4GHz radio transceiver designed for consumer ZigBee/IEEE 802.15.4, RF4CE, 6LoWPAN, and 2.4GHz ISM band applications. The radio transceiver is a true SPI-to-antenna solution. All RF-critical components except the antenna, crystal and de-coupling capacitors are integrated on-chip. Therefore, the AT86RF232 is particularly suitable for applications like:

? 2.4GHz IEEE 802.15.4 and ZigBee systems

? RF4CE systems

? 6LoWPAN systems

? Wireless sensor networks

? Residential and commercial automation

? Health care

? Consumer electronics

? PC peripherals

The AT86RF232 can be operated by using an external microcontroller like Atmel AVR® microcontrollers.

AT86RF232主要特性:

• High Performance RF-CMOS 2.4GHz radio transceiver targeted for IEEE® 802.15.4, ZigBee®, RF4CE, 6LoWPAN, and ISM applications

• Industry leading link budget:

- Receiver sensitivity -100dBm

- Programmable output power from -17dBm up to +3dBm

• Ultra-low current consumption:

- SLEEP = 0.4μA

- TRX_OFF = 330μA

- RX_ON = 11.8mA (LISTEN)

- BUSY_TX = 13.8mA (at max. transmit power)

• Ultra-low supply voltage (1.8V to 3.6V) with internal regulator

• Support for coin cell operation

• Optimized for low BoM cost and ease of production:

- Few external components necessary (crystal, capacitors and antenna)

• Easy to use interface:

- Registers, frame buffer and AES accessible through fast SPI

- Only two microcontroller GPIO lines necessary

- One interrupt pin from radio transceiver

- Clock output

• Radio transceiver features:

- 128-byte FIFO (SRAM) for data buffering

- Fully integrated, fast settling PLL to support Frequency Hopping

- Battery monitor

- Fast Wake-Up time < 0.4msec

• Special IEEE 802.15.4™-2011 hardware support:

- FCS computation and Clear Channel Assessment

- RSSI measurement, Energy Detection and Link Quality Indication

• MAC hardware accelerator:

- Automated acknowledgement, CSMA-CA and retransmission

- Automatic address filtering

- Automated FCS check

• Extended feature set hardware support:

- AES 128-bit hardware accelerator

- Antenna Diversity

- True Random Number Generation for security application

• Commercial temperature range:

- 0℃ to +70℃

• I/O and packages:

- 32-pin low-profile QFN package 5 x 5 x 0.9mm³

- RoHS/Fully Green

• Compliant to IEEE 802.15.4-2011, IEEE 802.15.4-2006 and IEEE 802.15.4-2003

• Compliant to EN 300 328/440, FCC-CFR-47 Part 15, ARIB STD-66, RSS-210


圖1.AT86RF232方框圖

圖2.AT86RF232接收器方框圖

圖3.AT86RF232發送器方框圖

圖3.AT86RF232基本應用電路圖
基本應用電路材料清單(BOM):


圖4.AT86RF232擴展特性應用電路圖

REB232ED-EK評估板

The Atmel REB232ED-EK demonstrates the unique performance and feature set of the Atmel® 2.4GHz radio transceiver AT86RF232 combined with the leading edge Atmel ATxmega256A3 microcontroller.

AT86RF232 is a feature-optimized wireless transceiver for consumer applications in the unlicensed 2.4GHz ISM band. It is ideal for, low complexity, peer-to-peer wireless applications like remote controls, health and fitness devices, toys, game controllers, and others. Radio transceiver features like hardware accelerators for IEEE 802.15.4 signal processing or advanced features like AES and antenna diversity can easily be evaluated with the REB232ED-EK kit. In addition it serves as a reference design for derived product developments.

This manual describes the REB232ED radio extender board supporting antenna diversity in combination with the Atmel AT86RF232 radio transceiver. Detailed information is given in the individual sections about the board functionality, the board interfaces, and the board design.

The REB232ED connects directly to the REB controller base board (REB-CBB), or can be used as an RF interface in combination with one of the Atmel microcontroller development platforms. The REB232ED together with a microcontroller forms a fully functional wireless node.

REB232ED-EK評估板主要特性:

• High-performance, 2.4GHz, RF-CMOS Atmel® AT86RF232 radio transceiver

targeted for IEEE® 802.15.4, ZigBee®, and ISM applications

- Industry leading 104dB link budget

- Ultra-low current consumption

- Ultra-low supply voltage (1.8V to 3.6V)

• Hardware supported antenna diversity

• RF reference design and high-performance evaluation platform

• Interfaces to several of the Atmel microcontroller development platforms

• Board information EEPROM

- MAC address

- Board identification, features, and serial number

- Crystal calibration values


圖5.連接到REB-CBB的REB232ED-EK評估板外形圖

圖6.REB232ED-EK評估板方框圖

圖7.REB232ED-EK評估板電路圖
REB232ED-EK評估板材料清單(BOM):


圖8.REB232ED-EK評估板PCB布局圖:GND和屏蔽
詳情請見:
http://www.atmel.com/dyn/resources/prod_documents/doc8321.pdf