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| Atmel AT86RF212 ZigBee应用方案 |
| 2008年7月21日 10:34
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Atmel 公司的AT86RF212是低功耗低电压800/900MHz收发器,特别设计用于低成本的IEEE 802.15.4 ZigBee应用和高数据速率的ISM应用. AT86RF212是真正的SPI到天线的解决方案.除了晶体,天线和去耦电容,所有的RF元件都在单芯片里.本文介绍了AT86RF212的主要性能,方框图, 基本的应用电路图和相应的元件清单以及扩展特性的应用电路图.
AT86RF212 Low Power 800/900 MHz Transceiver for IEEE 802.15.4- 2006, ZigbeeTM,and ISM Applications
The AT86RF212 is a low-power, low-voltage 800/900 MHz transceiver specially
designed for low-cost IEEE 802.15.4, ZigBeeTM, and high data rate ISM applications.
For the sub-1 GHz bands, it supports low data rates (20 and 40 kbit/s) of the IEEE
802.15.4-2003 standard [2] and provides optional data rates (100 and 250 kbit/s) using
O-QPSK, according to IEEE 802.15.4-2006 [1]. Furthermore, proprietary High Data
Rates Modes up to 1000 kbit/s can be employed.
The AT86RF212 is a true SPI-to-antenna solution. RF-critical components except the
antenna, crystal, and de-coupling capacitors are integrated on-chip. MAC and AES
hardware accelerators improve overall system power efficiency and timing.
The AT86RF212 single-chip RF transceiver provides a complete radio interface
between the antenna and the microcontroller. It comprises the analog radio part, digital
modulation and demodulation including time and frequency synchronization, as well as
data buffering. The number of external components is minimized so that only the
antenna, a filter (at high output power levels), the crystal, and four bypass capacitors
are required. The bidirectional differential antenna pins are used in common for RX and
TX, i.e. no external antenna switch is needed. Control of an external power amplifier is
supported by two digital control signals (differential operation).
AT86RF212主要特性:
Fully Integrated 800/900 MHz-Band Transceiver
-European ISM Band from 863 to 870 MHz
-North American ISM Band from 902 to 928 MHz
Direct Sequence Spread Spectrum with Different Modulation and Data Rates
-BPSK with 20 and 40 kbit/s (compliant to IEEE 802.15.4-2006)
-O-QPSK with 100 and 250 kbit/s (compliant to IEEE 802.15.4-2006)
-O-QPSK with 200, 400, 500, and 1000 kbit/s PSDU Data Rate
Flexible Combination of Frequency Bands and Data Rates
Industry Leading Link Budget
-Receiver Sensitivity up to -110 dBm
-Programmable TX Output Power up to +10 dBm
Low Power Supply Voltage from 1.8 V to 3.6 V
-Internal Voltage Regulators and Battery Monitor
Low Current Consumption
-SLEEP = 0.2 μA
-TRX_OFF = 0.4 mA
-RX_ON = 9 mA
-TX_ACTIVE = 19 mA (at PTX = 5 dBm)
Digital Interface
-Registers, Frame Buffer, and AES Accessible through SPI
-Clock Output with Configurable Rate
Radio Transceiver Features
-Adjustable Receiver Sensitivity
-Integrated TX/RX Switch, LNA, and PLL Loop Filter
-Fast Settling PLL Supporting Frequency Hopping
-Automatic VCO and Filter Calibration
-Integrated 16 MHz Crystal Oscillator
-128 byte FIFO for Transmit/Receive
IEEE 802.15.4-2006 Hardware Support
-FCS Computation and Check
-Clear Channel Assessment
-Received Signal Strength Indicator, Energy Detection, and Link Quality
Indication
MAC Hardware Accelerator
-Automatic Acknowledgement, CSMA-CA, and Retransmission
-Automatic Frame Filtering
AES 128 bit Hardware Accelerator (ECB and CBC modes)
Extended Feature Set Hardware Support
-True Random Number Generation for Security Applications
-TX/RX Indication (External RF Front End Control)
-MAC based Antenna Diversity
Optimized for Low BoM Cost and Ease of Production
-Low External Component Count: Antenna, Reference Crystal, and Bypass
Capacitors
-Excellent ESD Robustness
Industrial Temperature Range from -40°C to +85°C
32-pin Low-profile Lead-free Plastic QFN Package, 5.0 x 5.0 x 0.9 mm3
Compliant to IEEE 802.15.4-2003 and IEEE 802.15.4-2006, ETSI EN 300 220-1,
and FCC 47 CFR Section 15.247
图1.AT86RF212方框图
图2.基本的应用电路图
下表为基本应用电路图中的元器件清单(BOM):
图3.扩展特性的应用电路图
详情请见:
http://www.atmel.com/dyn/resources/prod_documents/doc8168.pdf
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