STMicroelectronics – Integrated transceiver enables design of compact KNX nodes


STMicroelectronics has introduced a highly integrated transceiver which helps to streamline the design of end nodes that support KNX, the popular network communications protocol for building-automation systems.

The STKNX is a certified KNX transceiver and is approved for use in KNX TP1-256 twisted-pair networks. Housed in a small 4mm x 4mm QFN package and requiring few external components, the STKNX can be used to implement compact KNX node designs.

And because the STKNX provides a simple interface to a host microcontroller, users can easily develop a smaller, simpler circuit to replace existing designs based on the use of discrete components for the physical layer.

The STKNX device features two integrated voltage regulators for external use in the application: a selectable 3.3V/5V linear regulator supplying a maximum of 20mA, and an adjustable switching DC-DC step-down converter supplying a maximum of 150mA.

The STKNX guarantees safe coupling to the KNX bus. It monitors the bus and provides a warning signal when it detects a loss of bus power.


  • KNX bus power extractor supports bus current up to 30mA
  • Adjustable KNX bus-current slew rate
  • No crystal required
  • Operating-temperature range: -40°C to 85°C


  • Devices operating on a KNX twisted-pair network

The EVALKITSTKNX kit is a board integrating the STMicroelectronics miniature STKNX transceiver. This kit includes all the necessary components required to evaluate the performance of the STKNX circuit and to develop a KNX device for operation on twisted-pair cabling.

Orderable Part Number: EVALKITSTKNX