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| RN2903低功耗长距离915MHz收发模块解决方案 |
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| 文章来源： 更新时间：2016/4/26 10:04:00 |
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Microchip公司的RN2903是基于无线LoRa技术的低功耗长距离和高组网功能的915MHz收发模块,采用LoRaWAN™协议堆栈,UART采用ASCII指令接口,RF接收灵敏度-146dBm,发送功率可调至+18.5dBm,IIP3=-11dBm, FSK, GFSK和LoRa技术调制,郊区覆盖高达15km,农村覆盖高达5km,工作电压2.1V到3.6V,温度范围-40°C 到+85°C,主要用在工业控制和监视,物联网(IoT),自动读表,家庭和建筑物自动化,无线告警和安全系统,机器对机器通信(M2M).本文介绍了RN2903通用特性和RF/模拟特性,框图,应用框图以及LoRa™ Mote演示板主要特性,电路图和材料清单.
The RN2903 is a fully-certified 915 MHz module based on wireless LoRa® technology. The RN2903 utilizes a unique spread spectrum modulation within the Sub-GHz band to enable long range, low power, and high network capacity.The module’s embedded LoRaWAN™ Class A protocol enables seamless connectivity to any LoRaWAN compliant network infrastructure, whether public or privately deployed. The module is specifically designed for ease of use, which shortens development time and speeds time to market. LoRa technology is ideal for battery-operated sensors and low power applications such as IoT, M2M, Smart City, Sensor networks, Industrial automation, and more.
The RN2903 transceiver module features LoRaTechnology RF modulation, which provides long rangespread spectrum communication with high interferenceimmunity.Using LoRa Technology modulation technique,RN2903 can achieve a receiver sensitivity of -146 dBm.
The high sensitivity combined with the integrated+18.5 dBm output power amplifier yields industryleading link budget, which makes it optimal forapplications requiring extended range and robustness.
LoRa Technology modulation also provides significantadvantages in both blocking and selectivity comparedto the conventional modulation techniques, solving thetraditional design compromise between extendedrange, interference immunity, and low-powerconsumption.
The RN2903 module delivers exceptional phase noise,selectivity, receiver linearity, and IIP3 for significantlylower power consumption. The level of conductiveharmonics is below -70 dBm.
RN2903通用特性:
• On-board LoRaWAN™ protocol stack
• ASCII command interface over UART
• Compact form factor: 17.8 x 26.7 x 3.34 mm
• Castellated SMT pads for easy and reliable PCBmounting
• Environmentally friendly, RoHS compliant
• Compliance:
- Modular Certified for the United States (FCC)and Canada (IC)
- Australia and New Zealand
• Device Firmware Upgrade (DFU) over UART.
工作特性:
• Single operating voltage: 2.1V to 3.6V (3.3Vtypical)
• Temperature range: -40℃ to +85℃
• Low-power consumption
• Programmable RF Communication Bit Rate up to300 kbps with FSK modulation, 12500 bps withLoRa® Technology modulation
• Integrated MCU, Crystal, EUI-64 Node IdentitySerial EEPROM, Radio Transceiver with AnalogFront End, Matching Circuitry
• 14 GPIOs for control and status
RF/模拟特性:
• Low-Power Long Range Transceiver operating inthe 915 MHz frequency band
• High Receiver Sensitivity: down to -146 dBm
• TX Power: adjustable up to +18.5 dBm highefficiency PA
• FSK, GFSK, and LoRa Technology modulation
• IIP3 = -11 dBm
• Up to 15 km coverage at suburban and up to 5 kmcoverage at urban area
RN2903应用:
• Automated Meter Reading
• Home and Building Automation
• Wireless Alarm and Security Systems
• Industrial Monitoring and Control
• Machine to Machine (M2M)
• Internet of Things (IoT)
图1.RN2903模块框图
图2. RN2903模块应用框图
图3.PICTAIL/PICTAIL PLUS子板电路图
LoRa™ Mote演示板
The LoRa™ Mote is a demonstration board that showcases the Microchip Low-Power Long Range LoRa™ Technology Transceiver Module.
The LoRa™ Mote provides access to the module through UART communications and
supports connection points to all GPIO-controlled module pins.
LoRa™ Mote演示板主要特性,如图4所示:
图4.LoRa™ Mote演示板外形图
1. 868/915 MHz High-Frequency SMA Connector
2. 433 MHz Low-Frequency Antenna Point
3. Module Breakout Header 1
4. Module Breakout Header 2
5. Module Connector
6. SSD1306 (128 x 64) Dot Matrix OLED
7. Module ICSP™ Programming Pads
8. Mote ICSP Programming Through Hole
9. S1 Switch (Navigation)
10. S2 Switch (Selection)
11. Sharp (GA1A1S202WP) Ambient Light Sensor
12. MCP9700T – Linear Active Thermistor
13. MCP1825S – LDO Regulator
14. PIC18LF25K50 8-bit MCU
15. Alternative Power Supply Through Hole Connectors
16. Descriptive LEDs, (2) Controlled by PIC18, (2) Controlled by Module
17. USB Mini-B Connector
18. Battery Power Switch
19. Web Site QR Code
20. (2) AAA Battery Pack
21. OLED SSD1306 Ribbon Connector
图5.LoRa™ Mote演示板电路图(1)
图6.LoRa™ Mote演示板电路图(2)
LoRa™ Mote演示板材料清单:
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