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Nuvoton NuMicro M251 Series Microcontroller

July 22, 2020

The M251/M252 series are 32-bit low-power microcontrollers with features such as low power consumption, wide operating voltage and fast wake-up in standby mode, and are particularly suitable for battery-powered IoT applications. The M251/M252 series are equipped with abundant peripherals and integrate variable voltage interface (VAI), providing a second set of communication interface voltage, and there is no need to add a voltage level converter when connecting with peripheral sensor modules. The editor of Nuvoton's agent will explain to you and customize the LoRa communication network, the terminal node can use Nuvoton NuMicro M251 series microcontroller as the main control chip.


In the IoT era, the layout of sensors has become more and more extensive. Whether it is an office building or a factory in Baiping, in the city center or in the wilderness, various sensors can be installed as the terminal nodes of the IoT network to collect information about the surrounding environment. Different environments have different communication methods between the sensor and the server. For example, in the wilderness, the distance between the sensor and the gateway is long, and battery life needs to be concerned. Most of them use low-power, long-distance wireless communication methods. LoRa low-power wide-area wireless communication technology is often used here. Kind of application scenarios. Although gateways can be densely erected in office buildings, there are many obstacles and communication interference in many different frequency bands inside the building. LoRa uses the frequency band below 1 GHz to communicate to reduce interference from other wireless communications.


LoRaWAN is a low-power wide area network standard launched by the LoRa Alliance, which regulates the entire system architecture and communication protocol, from the battery life of terminal nodes to the operation of gateways and servers. The custom LoRa communication network allows the network builder to fully control the entire network architecture, using proprietary protocols to diversify the networking, and can be set up as a master-slave star network or a tree network.

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