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| Atmel AT86RF230 ZigBee解决方案 | |||||
作者：Atmel 文章来源：本站原创 点击数： 更新时间：2007-8-29  |
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The AT86RF230 is a low-power 2.4 GHz transceiver specially designed for low cost ZigBee/IEEE802.15.4 applications. The AT86RF230 is a true SPI-to-antenna solution. All RF-critical components except the antenna, crystal and de-coupling capacitors are integrated on-chip. This single-chip radio transceiver provides a complete radio transceiver interface between the antenna and the microcontroller. It comprises the analog radio transceiver and digital demodulation including time and frequency synchronization and data buffering. The number of external components is minimized such that only an antenna, a crystal and four decoupling capacitors are required. The bidirectional differential antenna pins are used for RX and TX, so that no external antenna switch is needed. The receiver path is based on a low-IF architecture. The channel filter consists of a single sideband active RC resonator forming a 2 MHz band-pass filter with a Butterworth characteristic centered at 2 MHz. Two 1st-order high-pass filters are added to the signal path to achieve capacitive coupling at the single side-band filter (SSBF) output to suppress DC offset at the limiter amplifier. The limiter amplifier provides sufficient gain to overcome the DC offset of the succeeding ADC and generates a digital RSSI signal with 3 dB granularity. The low-IF signal is sampled at 16 MHz and is applied to the baseband digital signal processor. On the transmit side, direct VCO modulation is used. The modulation scheme is offset-QPSK (O-QPSK) with half-sine pulse shaping and 32-length block coding (spreading). This is equivalent to minimum shift keying (MSK) when transforming the spreading code sequences appropriately. The modulation signal is passed to the fractional-N PLL generating a coherent phase modulation required for O-QPSK demodulation. The frequency-modulated LO signal is fed to the power amplifier. Two on-chip low-dropout (LDO) voltage regulators provide the internal analog and digital 1.8V supply. The SPI interface and the control registers retain their settings in SLEEP state (see section 7) when the regulators are turned off. 主要特性: High Performance RF-CMOS 2.4 GHz Radio Transceiver Targeted for IEEE 802.15.4 and ZigBee Applications Industry Leading Link Budget (104 dB): Programmable Output Power from -17 dBm up to 3 dBm Receiver Sensitivity -101 dBm Ultra-Low Power Consumption: SLEEP: 0.1 μA RX: 16 mA TX: 17 mA (at max Transmit Power of 3 dBm) Ultra-Low Supply Voltage (1.8V to 3.6V) with Internal Regulator Optimized for Low BoM Cost and Ease of Production: Few External Components Necessary (Crystal, Capacitors and Antenna) Excellent ESD Robustness Easy to Use Interface: Registers and Frame Buffer Accessible through Fast SPI Only Two Microcontroller GPIO Lines Necessary One Interrupt Pin from Radio Transceiver Clock Output with Prescaler from Radio Transceiver Radio Transceiver Features: 128-byte SRAM for Data Buffering Programmable Clock Output, to Clock the Host Microcontroller or as Timer Reference Integrated TX/RX Switch Fully Integrated PLL with on-chip Loop Filter Fast PLL Settling Time Battery Monitor Fast Power-Up Time < 1 ms Special IEEE 802.15.4-2003 Hardware Support: FCS Computation Clear Channel Assessment Energy Detection / RSSI Computation Automatic CSMA-CA Automatic Address Filtering Automatic Acknowledge Industrial Temperature Range: -40° C to 85° C I/O and Packages: 32-pin Low-Profile QFN RoHS/Fully Green Compliant to EN 300 328/440, FCC-CFR-47 Part 15, ARIB STD-66, RSS-210 Compliant to IEEE 802.15.4-2003 AT86RF230方框图:  AT86RF230简化应用电路图:  AT86RF230评估板外形图:  AT86RF230应用电路图:  详情请见AT86RF230数据表: >http://www.atmel.com/dyn/resources/prod_documents/doc5131.pdf |
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