LoRa®-based Solutions for Low Power

One of Renesas’ solutions comprises a low power RA microcontrollers (RA2E1, RA2L1) and a LoRa® transceiver (Semtech SX1261/SX1262) for low power operation. This solution contributes to the realization of IoT sensor end-devices with long battery life.

RA LoRa® -based Solutions System Block

LoRaWAN® Average Current (Estimation): LoRaWAN® Class A Operation - TX + RX (ACK)

RA LoRaWAN® Average Current

Low power consumption of LoRaWAN® stack

  • LoRaWAN® stack shifts RF part to the most suitable low consumption mode automatically according to the internal operating state.
  • MCU part can be shifted to a low consumption mode during frame sending and receiving.
  • Low power timer function optimized for intermittent operation is supported. This can also be used from an application.

Development Environment for Easy Development and Evaluation

The software development environment consists of the RA2E1 Fast Prototyping Board, Evaluation Kit for RA2L1 MCU Group and the Semtech SX1261/SX1262. The use of wireless receivers and transmitters is restricted by international standards and domestic regulations. Wireless receivers and transmitters must therefore be used in accordance with the applicable laws and regulations of the country in which they are being used.

RA LoRa® Board

Software for Ease of Design

Renesas offers software for controlling a LoRa® transceiver (Semtech SX1261/SX1262) using a low power RA microcontrollers (RA2E1, RA2L1). For applications that require interoperability, there is the LoRaWAN® protocol stack based on the LoRaWAN® specification which implements LoRaWAN® protocol (Class A, Class B* and Class C) specified in the specification version 1.0.2/1.0.3/1.0.4. Control is performed using AT commands. For applications for which interoperability is not necessary, there is a radio driver for LoRa® for custom protocol implementation. (*Class B conforms to version 1.0.3/1.0.4).

RA LoRa Software

Supporting of Firmware Update over LoRaWAN®

FUOTA (Firmware Updates Over The Air) provides a function to remotely update a firmware over wireless communication. This function is a key feature for IoT applications deployed widely in the field and that require long term operation. The LoRa Alliance® standardized the FUOTA process utilizing the application layer protocols on top of the LoRaWAN® protocol, such as Clock Synchronization Message Package, Remote Multicast Setup Package and Fragmented Data Block Transport Package. These protocols can deliver a firmware image to multiple devices at the time specified by an application server.

Firmware Update over LoRaWAN®

Wireless Communication Tools for Ease of Evaluation

Renesas offers tools that make evaluating characteristics easy. Renesas LPWA Studio can perform continuous CW/Modulation transmission, PER (Packet Error Rate) / BER (Bit Error Rate) measurement, and RSSI measurement. It also has a sniffer function that captures LoRa®/GFSK modulation frames over the air and displays analysis results, as well as a function that transmits temperature/humidity sensor information of HS3001 connected to the transmitting node and visualizes it at the receiving node. Renesas also offers a tool that estimates power consumption.

Renesas LPWA Studio

Example of Application

  • Introduces you how to visualize sensor data transmitted by the RA2 Sensor Node to the Cloud (AWS/Azure/Cayenne) via LoRaWAN® networks. Refer to LoRaWAN® Sensor Demo.
    Visualize sensor data transmitted by the RA Sensor Node to the Cloud


Software & Tool Pages

Software title
Software type
Flexible Software Package (FSP)
FSP is an enhanced software package designed to provide easy-to-use, scalable, high-quality software for embedded system designs using Renesas RA Family of Arm Microcontrollers. Note: FSP with e² studio Installer (Platform Installer) will install the e² studio tool, FSP packs, GCC toolchain and Segger J-Link drivers required to use this software. No additional installations are required.
Software Package Renesas
1 item

Software Downloads

Software title Software type Type Date Date
ZIP 1.69 MB Sample Code
ZIP 9.36 MB Sample Code
2 items


Document title Document type
Date Date
PDF 507 KB Application Note
PDF 510 KB Application Note
PDF 614 KB Application Note
PDF 466 KB Application Note
PDF 1.07 MB Application Note
PDF 619 KB Application Note
PDF 1.09 MB Application Note
PDF 2.01 MB Manual - Software
PDF 2.01 MB Manual - Software
PDF 2.69 MB 日本語 Quick Start Guide
10 items
RA LoRa®-based Solution

This video introduces the RA LoRa®-based Solution. It realizes a true low-power wireless IoT system through combination of the low power RA2E1 microcontroller and LoRaWAN®.