STM32WL Wireless MCU with wM-Bus Stack for Smart Metering

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  • STMicroelectronics’ STM32 development ecosystem implements a range of low-power technologies
  • Stackforce’s wM-Bus stack and LoRaWAN capability proves beneficial for smart metering applications

STMicroelectronics along with Stackforce has released a wireless M-Bus (wM-Bus) software stack that makes effective use of the integrated sub-GHz radio and multiple modulation schemes supported by STM32WL microcontrollers to cut bill-of-materials cost and enhance flexibility for developers of smart-metering systems.

The wM-Bus stack complies with most of EN 13757-3/-7, covering the upper layers of the Wireless M-Bus protocol stack, as well as the lower layers (EN 13757-4) and its wM-Bus modes S, T and C in the 868MHz band. The mode N for operation at 169MHz is an option, too.

Additionally, it meets several other metering standards, including the most common Open Metering System (OMS) specification, as well as more specific standards like Dutch Smart Meter Requirements (DSMR) or CIG Italian Gas Committee specifications.

Supported by the STM32 development ecosystem, the STM32WL microcontrollers are ultra-low-power devices that use a range of ST technologies and design approaches to meet smart-meter designers’ needs. The sub-GHz radio inside STM32WL has a wide linear frequency range, dual power output and can satisfy EN 300 220, FCC CFR 47 Part 15, ARIB T108, and other radio-equipment regulations. Other key features include an integrated switched-mode power supply (SMPS) and hardware cryptographic accelerators.

Hakim Jaafar, Marketing Manager STM32 Wireless products at STMicroelectronics said, “STM32WL is reaching a new level of multi-protocol compatibility. With this wireless wM-Bus stack, the STM32WL can become the key product for a wide range of smart-metering applications such as electricity, gas and water metering.“

David Rahusen, Managing Director at Stackforce, said, “We will shortly add a wM-Bus over LoRaWAN stack that utilizes unique STM32WL features to merge the benefits of wM-Bus for seamless integration into metering infrastructure with the long-range capability of LoRaWAN urgently needed for metering applications.”

The Stackforce wM-Bus stack is now available. The wM-Bus over LoRaWAN stack will be available end of July 2020.

STM32WL devices with up to 256KByte Flash and a BGA73 package are in production now and are supported by ST’s 10-year product longevity commitment.


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