Overview
The STKNXTR, produced by STMicroelectronics, is a miniature transceiver device designed for KNX TP (Twisted Pair) communication. It is optimized for compact KNX node design due to its small package size and minimal external component requirements. The device features a simple interface to microcontrollers, enabling easy replacement of discrete component implementations. The STKNXTR includes two integrated voltage regulators and a KNX bus power extractor, making it a comprehensive solution for KNX network applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VFQFPN-24 (4x4 mm) | - |
| Operating Temperature Range | -40 to +85 | °C |
| KNX Certification | KNX TP1-256 supported | - |
| Linear Regulator Output | Selectable 3.3 V / 5 V - 20 mA | - |
| DC/DC Step Down Converter | Adjustable 1 V to 12 V - 150 mA | - |
| KNX Bus Power Extractor | Up to 30 mA | - |
| Bus Current Slew Rate (dI/dt) | Adjustable | - |
| No Crystal Required | - |
Key Features
- Very thin fine pitch 4 x 4 mm VQFNPN24 package
- KNX certified, KNX TP1-256 supported
- Easy interface to microcontroller
- Very small system solution
- Two integrated voltage regulators for external use:
- Selectable 3.3 V / 5 V - 20 mA linear regulator
- Adjustable 1 V to 12 V - 150 mA high-efficiency DC/DC step down switching converter
- KNX bus power extractor supporting bus current up to 30 mA
- Adjustable KNX bus current slew rate dI/dt
- No crystal required
- Operating temperature range -40 °C to +85 °C
Applications
The STKNXTR is primarily used in KNX twisted pair networks (KNX TP1-256) for various applications, including:
- Building automation systems
- Smart home devices
- Industrial automation
- KNX actuator and sensor devices
Q & A
- What is the STKNXTR used for?
The STKNXTR is a transceiver device for KNX TP communication, designed for use in KNX twisted pair networks.
- What are the key features of the STKNXTR?
The STKNXTR features a small package, easy interface to microcontrollers, two integrated voltage regulators, and a KNX bus power extractor.
- What are the operating temperature ranges of the STKNXTR?
The operating temperature range of the STKNXTR is -40 °C to +85 °C.
- Does the STKNXTR require a crystal?
No, the STKNXTR does not require a crystal.
- What is the maximum bus current supported by the KNX bus power extractor?
The KNX bus power extractor supports bus current up to 30 mA.
- How does the STKNXTR ensure compliance with KNX specifications?
The STKNXTR ensures compliance with KNX specifications through its impedance modulator, which controls the bus current slew rate and extracts power from the KNX bus.
- What types of voltage regulators are integrated into the STKNXTR?
The STKNXTR includes a selectable 3.3 V / 5 V linear regulator and an adjustable 1 V to 12 V high-efficiency DC/DC step down switching converter.
- What is the purpose of the impedance modulator in the STKNXTR?
The impedance modulator extracts power from the KNX bus, smooths load changes, and controls the impedance of the bus device according to KNX standard requirements.
- How does the STKNXTR handle bus voltage and current?
The STKNXTR handles bus voltage and current by extracting a stable power rail from the KNX bus DC level and limiting the bus current slope dI/dt.
- What are some common applications of the STKNXTR?
The STKNXTR is used in building automation systems, smart home devices, industrial automation, and KNX actuator and sensor devices.
