原标题：Atmel ATA5830低功耗UHF ASK(FSK)RF收发方案

　　Atmel公司的ATA5830是通用高度集成低功耗UHF ASK/FSK RF单片收发器,包括了RF部分,数字基带和AVR 微控制器内核,内核是采用增强RISC架构的低功耗CMOS 8位MCU.收发器工作在ISM频段,频率范围为310MHz- 318MHz, 418MHz-477MHz以及 836MHz - 928MHz,数据速率0.5k到20kBit/s Manchester,工作电压1.9V-3.6V和4.5V-5.5V,工作温度–40℃到+105℃,主要用在RKE,TPMS,遥控起动和控制系统,以及智能RF应用.本文介绍了ATA5830主要特性,方框图以及3V和5V的典型应用电路.

　　The Atmel® ATA5830 is a universal, highly integrated, low-power UHF ASK/FSK single chip RF transceiver. This IC contains the RF part, digital baseband and the AVR® microcontroller core. The core is a low-power CMOS 8-bit microcontroller with enhanced RISC architecture.

　　The transceiver is designed for ISM frequency bands in the 310MHz to 318MHz, 418MHz to 477MHz, and 836MHz to 928MHz ranges respectively while featuring a high degree of integration, which reduces the number of external elements. Outstanding RF performance and sophisticated baseband signal processing enables robust wireless communication.

　　The receiving path of the IC is designed using super heterodyne architecture with an integrated low-IF double quadrature mixer. This architecture features high image rejection and excellent blocking performance. The transmission path is implemented in a closed loop fractional-N modulator with Gauss shaping and preemphasis functionality for high data rates. Its flexible, configurable baseband signal processing also allows the receiver to operate in several scanning, wake-up, and automatic self-polling scenarios. During scanning the IC can seek specific message content (IDs) and in case of a valid telegram the data is stored in the FIFO data buffer.

　　The two completely different receiving baseband paths enable receiving and processing of two different incoming signals. The configuration of these signals can differ in modulation, data rate or wake-up scenario. The autonomous scanning of three different application channels with varying configuration is supported. The settings of the transceiver are stored in a 512-byte EEPROM. In spite of the internal microcontroller and 6-Kbyte flash for the customer application software, the device can be configured and accessed using an SPI interface. The debug wire and ISP interface are also available for programming purposes.

　　ATA5830主要特性:

　　• Supported Data Rate 0.5k to 20kBit/s Manchester (Higher Data Rates in ransparent

　　Mode)

　　• Programmable RX-IF Bandwidth 25kHz to 360kHz (Approx. 10% Increments)

　　• Frequency Ranges 310MHz to 318MHz, 418MHz to 477MHz, and 836MHz to 928MHz

　　– 315.00MHz/433.92MHz/868.30MHz and 915.00MHz with 24.305MHz Crystal Freq.

　　• Programmable Channel Frequency with Fractional PLL

　　– 92Hz Resolution for Low Band

　　– 184Hz Resolution for High Band

　　• FSK Deviation ±0.375kHz to ±90kHz

　　• FSK Sensitivity (Manchester) at 433.92MHz

　　– –106dBm at 20kBit/s, f = ±20kHz, IFBW = 165kHz

　　– –109dBm at 10kBit/s, f = ±10kHz, IFBW = 165kHz

　　– –111dBm at 5kBit/s, f = ±5kHz, IFBW = 165kHz

　　– –119dBm at 0.75kBit/s, f = ±0.75kHz, IFBW = 25kHz

　　• ASK Sensitivity (Manchester) at 433.92MHz

　　– –108dBm at 20kBit/s, BW = 360kHz

　　– –116dBm at 1kBit/s, BW = 360kHz

　　• Excellent Blocking (IFBW = 165kHz): 64dBC at Freq. Offset = 1MHz and 50dBC at 25kHz

　　• High Image Rejection Typ. 55dB (315MHz/433.92MHz); Typ. 50dB 68.3MHz/915MHz) without Calibration

　　• Input 1dB Compression Point

　　– Typ. –35dBm (Full Sensitivity Level)

　　– Typ. –20dBm (15dB Reduced Sensitivity)

　　• Digital RSSI with Accuracy of ±5dB and 0.5dB Resolution

　　• Programmable Output Power –10dBm to 14dBm (1dB Increments)

　　• Low Current Consumption

　　– Typ. 9.3mA for RX (Low Band) Typ. 580μA Three-channel Polling

　　– Typ. 9.6/15.5mA for TX (Low Band, Pout = 6/10dBm)

　　• Max. Power Down Current Consumption of 600nA at VS = 3.6V and T = 85℃

　　• Programmable Clock Output Derived from Crystal Frequency

　　• 6Kbytes of In-system Self-programmable Flash for an Additional Application Software

　　• 24Kbytes of ROM with Atmel Firmware

　　• 512 Bytes of EEPROM Data Memory for Transceiver Configuration and 768 Bytes of SRAM

　　• SPI Interface for RX/TX Data Access and Transceiver Configuration

　　• IRQ Signal Indicates the IC Condition Status

　　• Automatic Antenna Tuning at TX Center Frequency for Loop Antenna

　　• Automatic Application Channel Polling (3 RKE Channels, TPMS, RS)

　　• ID Scanning Up to 18 Different IDs (ID Lengths of up to 4 Bytes)

　　• Supply Voltage Range 1.9V to 3.6V and 4.5V to 5.5V

　　• Temperature Range –40℃ to +105℃

　　• Excellent ESD Protection at All Pins (±4kV HBM, ±200V MM, ±750V FCDM)

　　• Small 5mm x5mm QFN 32 Package Pin/Pitch 0.5mm

　　• Pin Compatible IC with Rx Performance Identical with the Atmel Receiver ATA5780

　　• Appropriate for Application Systems Compliant with EN 300 220 and FCC 15

　　ATA5830目标应用:

　　The transceiver is designed for use in the following application areas:

　　• Remote Keyless Entry System (RKE)

　　• Tire Pressure Monitoring System (TPMS)

　　• Remote Start System (RS)

　　• Remote Control System, e.g. garage door openers

　　• Smart RF applications

　　图1.ATA5830简化系统方框图

　　图2.ATA5830 CPU核方框图

　　图3.ATA5830典型3V应用电路图

　　图4.ATA5830典型5V应用电路图

　　图5.ATA5830采用回路天线的典型3V应用电路图