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Long-Range Wireless STM32WL Microcontrollers

August 30, 2020 by STMicroelectronics

Complementing the STM32 RF connectivity portfolio, the STM32WL System-On-Chip integrates both a general-purpose microcontroller and a sub-GHz radio on the same chip.

Built on an Arm® Cortex®‐M4 core architecture, STM32WL microcontrollers also support multiple modulations– LoRa®, (G)FSK, (G)MSK, BPSK – to ensure flexibility in wireless applications with LoRaWAN® or any other suitable protocol in a fully open way.



STM32WL microcontrollers feature a sub-GHz radio based-on Semtech SX126x to meet the requirements of a wide range of Low-Power Wide Area Network (LPWAN) wireless applications in industrial and consumer Internet-of-Things (IoT).



The embedded sub-GHz transceiver comes with a LoRaWAN® radio stack available on demand.

Thanks to a deep integration, the innovative and open architecture is optimized for LoRaWAN® legacy / proprietary protocols, flexible resource use, power management and helps lower BOM cost while offering a better user experience.

Developed using the same technology as the one implemented in our ultra-low-power STM32L4 microcontrollers, the STM32WL series provides a similar digital and analog peripherals for basic or complex application use cases requiring an extended battery life and a long RF range through its sub-GHz transceiver.

To ensure worldwide compatibility, the STM32WL MCUs feature a dual power-output and a wide linear frequency range fitting any unlicensed RF spectrum need.

Overall, the STM32WL series is the STM32 family’s pioneer in sub-GHz wireless connectivity, offering ease-of-use and reliability, while being perfectly tailored for a wide range of industrial and consumer applications.


Wireless Connectivity

STM32WLE5 microcontrollers comply with the physical layer requirements of the LoRaWAN® specification released by the LoRa Alliance®. Available LoRa®, (G)FSK, (G)MSK and BPSK modulations can also be used in legacy and proprietary protocols.

The radio is suitable for systems targeting compliance with radio regulations including, but not limited to, ETSI EN 300 220, FCC CFR 47 Part 15, China regulatory requirements and the Japanese ARIB T-108. Continuous frequency coverage from 150 to 960 MHz enables the support of all major sub-GHz ISM bands around the world.



System Peripherals

The STM32WLE5 line includes a wide variety of communication features including up to 43 GPIOs, an integrated SMPS for power consumption optimization, multiple low-power modes to maximize battery life. A dual-power output and a wide linear frequency range ensure worldwide compatibility.


Security & ID

In addition to its wireless and ultra-low-power features, STM32WL microcontrollers include embedded security hardware functions such as 128- / 256-bit AES hardware encryption, PCROP read / write protection, and public-key cryptography with an elliptic curve encryption engine.

Please contact your local sales office to order STM32WLE5 microcontrollers and be provided with additional resources, including LoRaWAN® protocol stack.