原标题：Atmel ATmega256RFR2系统级芯片无线参考设计

　　Atmel公司的ATmega256RFR2是基于AVR增强RISC架构的低功耗CMOS 8位MCU,集成了用于2.4GHz ISM频段的高数据速率收发器,具有135条功能强大的指令,具有256KB/128KB/64KB在系统自编程的闪存,8kB/4kB/2kB EEPROM 及32KB/16KB/8KB SRAM,主要用在ZigBee® / IEEE 802.15.4-2011/2006/2003™全功能设备,带MCU的通用2.4GHz ISM收发器以及RF4CE, SP100, WirelessHART™, ISM应用和IPv6 / 6LoWPAN.本文介绍了ATmega256RFR2主要特性,框图, 基本应用电图及材料清单, 扩展特性应用电图以及参考设计RCB256RFR2主要特性,框图,电路图和材料清单以及PCB元件布局图.

　　The ATmega256/128/64RFR2 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture combined with a high data rate transceiver for the 2.4 GHz ISM band.

　　By executing powerful instructions in a single clock cycle, the device achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

　　The radio transceiver provides high data rates from 250 kb/s up to 2 Mb/s, frame handling, outstanding receiver sensitivity and high transmit output power enabling a very robust wireless communication.

　　ATmega256RFR2主要特性:

　　• Network support by hardware assisted Multiple PAN Address Filtering

　　• Advanced Hardware assisted Reduced Power Consumption

　　• High Performance, Low Power AVR® 8-Bit Microcontroller

　　• Advanced RISC Architecture

　　- 135 Powerful Instructions – Most Single Clock Cycle Execution

　　- 32x8 General Purpose Working Registers / On-Chip 2-cycle Multiplier

　　- Up to 16 MIPS Throughput at 16 MHz and 1.8V – Fully Static Operation

　　• Non-volatile Program and Data Memories

　　- 256K/128K/64K Bytes of In-System Self-Programmable Flash

　　• Endurance: 10’000 Write/Erase Cycles @ 125℃ (25’000 Cycles @ 85℃)

　　- 8K/4K/2K Bytes EEPROM

　　• Endurance: 20’000 Write/Erase Cycles @ 125℃ (100’000 Cycles @ 25℃)

　　- 32K/16K/8K Bytes Internal SRAM

　　• JTAG (IEEE std. 1149.1 compliant) Interface

　　- Boundary-scan Capabilities According to the JTAG Standard

　　- Extensive On-chip Debug Support

　　- Programming of Flash EEPROM, Fuses and Lock Bits through the JTAG interface

　　• Peripheral Features

　　- Multiple Timer/Counter & PWM channels

　　- Real Time Counter with Separate Oscillator

　　- 10-bit, 330 ks/s A/D Converter; Analog Comparator; On-chip Temperature Sensor

　　- Master/Slave SPI Serial Interface

　　- Two Programmable Serial USART

　　- Byte Oriented 2-wire Serial Interface

　　• Advanced Interrupt Handler and Power Save Modes

　　• Watchdog Timer with Separate On-Chip Oscillator

　　• Power-on Reset and Low Current Brown-Out Detector

　　• Fully integrated Low Power Transceiver for 2.4 GHz ISM Band

　　- High Power Amplifier support by TX spectrum side lobe suppression

　　- Supported Data Rates: 250 kb/s and 500 kb/s, 1 Mb/s, 2 Mb/s

　　- -100 dBm RX Sensitivity; TX Output Power up to 3.5 dBm

　　- Hardware Assisted MAC (Auto-Acknowledge, Auto-Retry)

　　- 32 Bit IEEE 802.15.4 Symbol Counter

　　- SFD-Detection, Spreading; De-Spreading; Framing ; CRC-16 Computation

　　- Antenna Diversity and TX/RX control / TX/RX 128 Byte Frame Buffer

　　- Phase measurement support

　　• PLL synthesizer with 5 MHz and 500 kHz channel spacing for 2.4 GHz ISM Band

　　• Hardware Security (AES, True Random Generator)

　　• Integrated Crystal Oscillators (32.768 kHz & 16 MHz, external crystal needed)

　　• I/O and Package

　　- 38 Programmable I/O Lines

　　- 64-pad QFN (RoHS/Fully Green)

　　• Temperature Range: -40℃ to 125℃ Industrial

　　• Ultra Low Power consumption (1.8 to 3.6V) for AVR & Rx/Tx: 10.1mA/18.6 mA

　　- CPU Active Mode (16MHz): 4.1 mA

　　- 2.4GHz Transceiver: RX_ON 6.0 mA / TX 14.5 mA (maximum TX output power)

　　- Deep Sleep Mode: <700nA @ 25℃

　　• Speed Grade: 0 – 16 MHz @ 1.8 – 3.6V range with integrated voltage regulators

　　ATmega256RFR2应用:

　　• ZigBee® / IEEE 802.15.4-2011/2006/2003™ – Full and Reduced Function Device

　　• General Purpose 2.4GHz ISM Band Transceiver with Microcontroller

　　• RF4CE, SP100, WirelessHART™, ISM Applications and IPv6 / 6LoWPAN

　　图1. ATmega256RFR2框图

　　图2. ATmega256RFR2(64引脚)基本应用电图

　　基本应用电图材料清单:

　　图3. ATmega256RFR2(64引脚)扩展特性应用电图

　　参考设计RCB256RFR2

　　The RCB256RFR2 is designed to provide a reference design for the Atmel ATmega256RFR2 [1] single-chip microcontroller and radio transceiver. The IC integrates a powerful, 8-bit AVR® RISC microcontroller, an IEEE 802.15.4™-compliant transceiver, and additional peripheral features. The built-in radio transceiver supports the worldwide accessible 2.4GHz ISM band.

　　The system is designed to demonstrate standard-based applications such as ZigBee/IEEE 802.15.4, ZigBee RF4CE, and 6LoWPAN, as well as high data rate ISM applications. The SMA antenna connector allows either operation with the antenna provided with the RCB or conducted RF performance measurements.

　　The RF section has been shielded to eliminate interference from sources external to the ATmega256RFR2. To investigate the reference design area, the shield can be opened by removing the snap-in cover while the RCB is not in operation.

　　Most peripheral features of the ATmega256RFR2 are made available through two expansion connectors (EXT0/1). There are a variety of base boards available for the RCB family.

　　参考设计RCB256RFR2主要特性:

　　• Stand-alone operable radio controller board (RCB)

　　• Design based on the single-chip Atmel® ATmega256RFR2 to support IEEE® 802.15.4, ZigBee®, 6LoWPAN, RF4CE, SP100, WirelessHART®, and ISM applications

　　• FCC-ID: VW4A091786

　　• SMA RF connector

　　• Simple user interface with button and LEDs

　　• Board information EEPROM containing

　　• MAC address

　　• Board identification, features, and serial number

　　• Crystal calibration values

　　• 2 × AAA batteries for stand-alone operation

　　• 60-pin extension connector to interface with application-specific hardware

　　图4. 参考设计RCB256RFR2外形图

　　图5. 无线电控制器框图

　　参考设计RCB256RFR2材料清单: