STMicroelectronics KNX-RF software

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STMicroelectronics has released KNX-RF software for the S2-LP ultralow-power radio transceiver to enable energy-saving standardised wireless connectivity for smart-building controls. Ready to run on an STM32 microcontroller (MCU) or alternatively on a BlueNRG-2 Bluetooth Low Energy system-on-chip (SoC) that embeds an Arm Cortex-M0 core running at 32 MHz and a comprehensive set of I/O peripherals, the software contains a certified KNX-RF stack, RF adaptation layer and S2-LP library needed to connect the transceiver to create an ultralow-power wireless KNX node.

Operating in the 868.3 MHz band at only 10 mA with +10 dBm output, the S2-LP delivers energy-efficient, secure and robust wireless connectivity, prolonging battery runtime. Combining the S2-LP radio and BlueNRG-2 SoC enables a hybrid and low-power optimised KNX/Bluetooth solution in two chips, allowing a smartphone to access KNX-based networks and provide an intuitive and stylish interface for conveniently monitoring, controlling, configuring, provisioning and updating the KNX nodes.

Whether hosted on the BlueNRG-2 or STM32 MCU, the KNX-RF software enables innovation and power savings for push-buttons, light switches, occupancy sensors, roller-shutter controls, dimmer actuators and other devices for lighting, heating, HVAC and energy-harvesting systems. The software meets the latest KNX-RF Multi specification, which supports secure (S mode), encrypted communications and frequency agility with five channels to help avoid interference and permit fast and slow communication modes to save power. Further features of KNX-RF Multi allow larger numbers of KNX devices to coexist on the network, including listen before talk (LBT), fast acknowledge with auto-retry and support for repeaters.

For more information: www.st.com/s2-lp-pr.