KNX transceiver integrates power for building automation
Developed with Tapko Technologies, the STKNX functions as a complete KNX transceiver for twisted-pair wired in a footprint of just 4mm x 4mm. It can be used for connecting devices such as smart lights, switches, HVAC ait conditioning controllers, alarms, or smart appliances to KNX twisted-pair networks.
The integrated KNX bus power extractor provides up to 30mA to the integrated voltage regulators to power external devices and the STKNX transceiver’s own power needs, while limiting the bus current slew rate according to KNX specifications, further enhancing the system efficiency. The on-chip voltage regulators include a selectable 3.3V/5V 20mA linear regulator and 150mA high-efficiency DC/DC step-down switching converter with adjustable output voltage from 1V to 12V, which can be used to power external components. In addition, the STKNX integrates circuitry to ensure safe coupling to the bus and implements bus monitoring to protect against loss of bus power.
The STKNX is supported by a complete network-node solution that includes the KNX software stack, co-created by ST and Tapko. The stack is ready to run on any host microcontroller from ST’s STM32 family. The quick-start evaluation kit, EVALKITSTKNX, is also available, containing everything needed to build a KNX node including a STM32F103RBT6 microcontroller, Arduino-compatible headers for custom function expansion, and a sample LED-dimming application.
The KNX open fieldbus specification is widely adopted by building-automation standards, including European EN 50090 and EN 13321-1/2 standards, the global ISO/IEC 14543-3 standard, and Chinese GB/T 20965. KNX is also referenced in the US ANSI/ASHRAE standard 135.
In a 0.5mm-pitch 24-pin VQFNPN24, the STKNX is the smallest transceiver certified for KNX TP1-256 twisted-pair connections currently on the market and is designed for crystal-less operation, saving more space by eliminating external components while also helping simplify design.
“We are using the STKNX transceiver as an important part of our new generation of products for home and building automation systems,” said Alessandro Ravagnin, Systems Marketing Manager at Tapko customer Vimar SpA.
“Our successful cooperation with Tapko has delivered software and hardware for product developers to create highly functional and stylish building-automation products that enhance both the convenience and the appearance of homes and offices,” said Domenico Arrigo, General Manager Industrial and Power Conversion Division, STMicroelectronics,
The STKNX transceiver is available now.
If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :
