MicroBCU2

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MicroBCU2
MicroBCU2 V00 11 soldered top.jpg
MicroBCU2 V00 11 soldered bot.jpg
Developer SirSydom
Status beta
Version V00.20
Microcontroller/Board universal


Description

A Bus Coupler Unit (BCU) / KNX Transveiver which supplies the connected device with power from KNX Bus and provides a bus interface at OSI Layer 2.


Hardware

  • IC: NCN5120 (ready for NCN5121 / 5130)
  • Size: 23 x 19 x 9 mm
  • Voltage 1: 3.3V
  • Voltage 2 (optional): 5V (default), can be changed: 3.3V - 21V
  • Max. current: up to 100mA
  • UART: 19200bps 8E1 / 3.3V

User Documentation

Soldering the Kit

MicroBCU2 comes as a kit where the big parts on the bottom side have to be soldered:

  • C4 - 100µF / 35V electrolytic capacitor. Polarization is important, refer to silkscreen or photo
  • C41 - 1µF MLCC 1206
  • L1 and L2 - 220µH inductors
  • R1 - 22R resistor 2512
  • J1 - 7x1 2.54 pin header (or whatever you need to connect to your host PCB)
  • D1 - SS16 reverse polarity protection diode. . Polarization is important, refer to silkscreen. The bar on the diode should match the bar on silkscreen.
  • D2 - SMAJ40CA TVS diode

I recommend to solder the parts in this order: L1, L2, C4, C41, R1, D1, D2, J1

Deactivate / Change VCC2

Enable High Bus current

Schematic

KiCad

Developer Documentation

Links

Vorstellungs- / Entwicklunsthread im KNX User Forum

OnSemi NCN5120 Datasheet