原标题：大联大推出基于Semtech LoRa扩频通信技术的超长距离低功耗物联网解决方案

　　2015年10月19日，致力于亚太地区市场的领先半导体元器件分销商—大联大控股宣布，其旗下友尚推出基于Semtech的LoRa扩频通信技术实现的超长距离低功耗物联网解决方案，该方案以Semtech 的SX1276和ST的STM8L151K4为核心器件构成。

　　物联网市场正以惊人的速度在爆发式的增长，其应用将遍布各个行业和领域。但如何以最佳的性价比来解决低功耗的超长距离物联网应用一直是工程师所面临的重大挑战之一：Mesh网络和GSM虽可解决长距离组网需求，但他们分别受制于高能耗和高成本。针对上述制约，大联大友尚为此特别推出基于LoRa扩频通信技术的物联网解决方案，以最佳的性价比同时将低功耗和长距离二者兼得。

　　图示1-大联大友尚推出的LoRa扩频通信技术物联网解决方案框图

　　大联大友尚代理的ST STM8L151K4采用130nm制程，逻辑功能采用超低漏电流晶体管，模拟功能采用低压晶体管，同时选用创新的低功耗嵌入式存储器、新的低压低功耗标准外设和创新的电源管理架构。这款超低功耗的8位MCU可解决工程师对高效处理器架构的需求，具有低成本、低功耗和高设计灵活性的优点。

　　图示2-大联大友尚推出的LoRa扩频通信技术物联网解决方案照片

　　功能描述：

　　1、网关(有液晶屏幕)

　　- 可当作星状网络网关使用

　　- 可当作单向传输接收端

　　2、节点端(无液晶屏幕)

　　- 可当作星状网络节点网关使用

　　- 可当作单向传输发射端

　　3、GPS 模块(选用)

　　- 可使用于节点段发送GPS地址

　　大联大友尚代理的SX127x系列是Semtech提供给远程大容量数据网络系统解决方案的关键通讯器件。除传统的GFSK调制技术外，新型的SX127x系列还采用了LoRa™扩频技术。

　　LoRa扩频技术有如下显着特点：

　　抗干扰强：是扩频通信主要特性之一，因信号接收需要扩频编码进行相关解扩处理才能得到，所以即使以同类型信号进行干扰，干扰也不起作用;

　　隐蔽性好：因为信号在很宽的频带上被扩展，其信号功率谱密度极低，不仅难以被发现，更很少对于其他通信设备构成干扰;

　　通信距离长：LoRa技术系列产品在美国、欧盟、中国和日本监管机构设定的限制内工作时，可将郊区的数据传输距离提升至15公里(9英里)以上，城市密集区域的数据传输距离提升至2-5公里(3英里)，可显着降低对中续器的需求。以美国纽约曼哈顿下城区为例，只要七个网关机便能完整覆盖;

　　功耗低：LoRa技术对于物联网应用最明显的好处即为可以延长电池寿命，对于未来可能遍布在城市中的传感器来说无疑是巨大优势，且可降低运营成本。

　　据行业分析师对截至2020年总计500亿个节点的预测，物联网市场的飞速发展切需要改善其物理层，以期实现更远传输距离、电池低功耗运行以及低成本批量部署。而LoRa™技术不但是满足这些需求的理想解决方案，还是对这一快速发展市场中2G/3G GSM的极具诱惑力的另一选择。

　　应用案例：

　　某公司需由总公司MIS监控上海，台北，深圳三地工厂人员进出或财产物流动向

　　图示3-大联大友尚推出的LoRa扩频通信技术物联网解决方案应用案例

　　某大游乐园想要有一产品可以出租给父母让他们可以追踪小朋友位置, 不用担心走失

　　图示4-大联大友尚推出的LoRa扩频通信技术物联网解决方案应用案例

　　【STM8L151K4】

　　The medium-density STM8L151x4/6 and STM8L152x4/6 devices are members of the STM8L ultra-low-power 8-bit family. The medium-density STM8L15x family operates from 1.8 V to 3.6 V (down to 1.65 V at power down) and is available in the -40 to +85 °C and -40 to +125 °C temperature ranges.

　　The medium-density STM8L15x ultra-low-power family features the enhanced STM8 CPU core providing increased processing power (up to 16 MIPS at 16 MHz) while maintaining the advantages of a CISC architecture with improved code density, a 24-bit linear addressing space and an optimized architecture for low power operations.

　　The family includes an integrated debug module with a hardware interface (SWIM) which allows non-intrusive In-Application debugging and ultra-fast Flash programming.

　　All medium-density STM8L15x microcontrollers feature embedded data EEPROM and low-power, low-voltage, single-supply program Flash memory.

　　They incorporate an extensive range of enhanced I/Os and peripherals.

　　The modular design of the peripheral set allows the same peripherals to be found in different ST microcontroller families including 32-bit families. This makes any transition to a different family very easy, and simplified even more by the use of a common set of development tools.

　　Six different packages are proposed from 28 to 48 pins. Depending on the device chosen, different sets of peripherals are included.

　　All STM8L ultra-low-power products are based on the same architecture with the same memory mapping and a coherent pinout.

　　Key Features

　　Operating conditions

　　Operating power supply range 1.8 V to 3.6 V (down to 1.65 V at power down)

　　Temp. range: - 40 °C to 85, 105 or 125 °C

　　Low power features

　　5 low power modes: Wait, Low power run (5.1 μA), Low power wait (3 μA), Active-halt with full RTC (1.3 μA), Halt (350 nA)

　　Consumption: 195 μA/MHz + 440 μA

　　Ultra-low leakage per I/0: 50 nA

　　Fast wakeup from Halt: 4.7 μs

　　Advanced STM8 core

　　Harvard architecture and 3-stage pipeline

　　Max freq. 16 MHz, 16 CISC MIPS peak

　　Up to 40 external interrupt sources

　　Reset and supply management

　　Low power, ultra-safe BOR reset with 5 selectable thresholds

　　Ultra-low-power POR/PDR

　　Programmable voltage detector (PVD)

　　Clock management

　　1 to 16 MHz crystal oscillator

　　32 kHz crystal oscillator

　　Internal 16 MHz factory-trimmed RC

　　Internal 38 kHz low consumption RC

　　Clock security system

　　Low power RTC

　　BCD calendar with alarm interrupt

　　Auto-wakeup from Halt w/ periodic interrupt

　　LCD: up to 4x28 segments w/ step-up converter

　　Memories

　　Up to 32 KB of Flash program memory and 1 Kbyte of data EEPROM with ECC, RWW

　　Flexible write and read protection modes

　　Up to 2 Kbyte of RAM

　　DMA

　　4 channels; supported peripherals: ADC, DAC, SPI, I2C, USART, timers

　　1 channel for memory-to-memory

　　12-bit DAC with output buffer

　　12-bit ADC up to 1 Msps/25 channels

　　T. sensor and internal reference voltage

　　2 ultra-low-power comparators

　　1 with fixed threshold and 1 rail to rail

　　Wakeup capability

　　Timers

　　Two 16-bit timers with 2 channels (used as IC, OC, PWM), quadrature encoder

　　One 16-bit advanced control timer with 3 channels, supporting motor control

　　One 8-bit timer with 7-bit prescaler

　　2 watchdogs: 1 Window, 1 Independent

　　Beeper timer with 1, 2 or 4 kHz frequencies

　　Communication interfaces

　　Synchronous serial interface (SPI)

　　Fast I2C 400 kHz SMBus and PMBus

　　USART (ISO 7816 interface and IrDA)

　　Up to 41 I/Os, all mappable on interrupt vectors

　　Up to 16 capacitive sensing channels supporting touchkey, proximity, linear touch and rotary touch sensors

　　Development support

　　Fast on-chip programming and non intrusive debugging with SWIM

　　Bootloader using USART

　　96-bit unique ID