Interface_KNX/EIB Transceiver

E981.23 | KNX-Transceiver with Hardware Current Programming


The E981.23 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 E981.23 and the host processor can be established by either UART 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)

Included power supplies
- 20V supply, up to 20mA
- 3.3V / 5V (100mA) DC/DC converter


  • KNX/EIB transceiver, certified according to KNX TP1-256
  • Analog mode supported
  • Configuration pins for bus current & slope
  • Configuration pins for external clock frequency 8 or 7.3728 MHz
  • Further configuration and diagnosis via UART
  • Voltage regulators
    - 20V: current capability up to 25mA
    - 3.3V or 5V DC/DC converter: current capability up to 100mA


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

Ordering Information

  • Samples
    Part No.Temp. RangePackageOrder No.
    E981.23-25°C to +85°C QFN32L7 E98123A38B


  • Boards
    Part No.DescriptionBoard typeOrder No.
    E981.23KNX/EIB TransceiverKNX TP 815 Evaluation Board V2K98123-0001


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Application Diagram

KNX-Transceiver with Hardware Current Programming