Interface_KNX/EIB Transceiver

E981.03 | KNX/EIB Transceiver


The E981.03 combines the TP1-256 physical layer, the communication controller and two DC supply outputs for bus powered applications. The internal power management assures KNX conformance under all load conditions.
The connection between the E981.03 and the host processor can be established by either UART or SPI compatible interfaces, or in direct Analog Mode.

KNX® Interface
- Extended frames with up to 254 byte payload
- Analog Mode (direct RX / TX interface)
- Autonomous Telegram trigger
- Alarm Telegram
- Autonomous poll data transfer

UART host interface
- Supports 9.6 k, 19.2 k, 115.2 k
- 9 bit mode for easy data stream interpretation
- Optional CRC (at 19.2kBd and 115.2 kBd)

SPI™ host interface

- if not used 4 GPIOs are available

Included power supplies
- 20V supply, up to 20mA
- 3.3V (70mA) / 5V (70mA) DC/DC converter


  • KNX/EIB transceiver, certified according to KNX TP1-256
  • Analog mode supported
  • Configurable bus current (maximum current and slew rate)
  • Voltage regulators
    - 20V: current capability up to 20mA
    - 3.3V or 5V DC/DC converter: current capability up to 70mA
  • UART host interface (data rate up to 115.2 Kbit/s)
  • SPI for configuration (optional)


  • Sensors, actuators, routers, gateways, Bus-powered or externally supplied
  • Security applications

Ordering Information

  • Samples
    Part No.Temp. RangePackageOrder No.
    E981.03-25°C to +85°C QFN32L7E98103A38B


  • Boards
    Part No.DescriptionBoard typeOrder No.
    E981.03KNX/EIB TransceiverKNX TP DemoboardK98103-0001
    E981.03KNX/EIB TransceiverKNX TP 815 Evaluation Board V2K98103-0002


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Application Diagram

KNX/EIB Transceiver