Wireless M-bus stack for smart meter chips

Wireless M-bus stack for smart meter chips

New Products |
By Nick Flaherty

STMicroelectronics has worked with Stackforce in Eschbach, Germany, to develop a wireless M-Bus (wM-Bus) software stack smart meter chips.

The wM-bus stack on the STM32WL sub-GHz wireless microcontrollers cuts the bill-of-materials cost and boosts the flexibility for developers of long range smart meter systems.

The Stackforce 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 used throughout Europe in the 868MHz band.

The mode N for operation at 169MHz is an option as well for even greater range. The stack supports other smart meter 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. Stackforce is planning to add support for the LoRaWAN long range wireless mesh technology for smart meter designs.

“Thanks to our collaboration with Stackforce, 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,“ said Hakim Jaafar, Marketing Manager STM32 Wireless products at STMicroelectronics.

“We’re proud to be chosen by ST for collaboration on the next level of embedded integration. 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,” said David Rahusen, Managing Director at Stackforce.

The STM32WL microcontrollers are ultra-low-power devices that use a range of ST technologies and design approaches for smart meter designs. The sub-GHz radio inside the chip 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, including China regulatory requirements to assist development of products for markets worldwide. Other key features include an integrated switched-mode power supply (SMPS) and hardware cryptographic accelerators.

The Stackforce wM-Bus stack is available immediately. The wM-Bus over LoRaWAN stack will be available by the 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 lifetime.

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