Difference between revisions of "MicroBCU2"

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== Description ==
 
== 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.
+
A a compact bus coupling unit for KNX building automation based on the NCN5120 knx transceiver. It serves as a power supply and UART access to KNX bus.
 
 
  
 
== Hardware ==
 
== Hardware ==
 
*IC: NCN5120 (ready for NCN5121 / 5130)
 
*IC: NCN5120 (ready for NCN5121 / 5130)
 
*Size: 23 x 19 x 9 mm
 
*Size: 23 x 19 x 9 mm
 +
*Weight: about 4g
 
*Voltage 1: 3.3V
 
*Voltage 1: 3.3V
 
*Voltage 2 (optional): 5V (default), can be changed: 3.3V - 21V
 
*Voltage 2 (optional): 5V (default), can be changed: 3.3V - 21V
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*Ripple at VCC1+2: about 50mV
 
*Max. current: up to 100mA
 
*Max. current: up to 100mA
 
*UART: 19200bps 8E1 / 3.3V
 
*UART: 19200bps 8E1 / 3.3V
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== User Documentation ==
 
== User Documentation ==
  
=== Soldering the Kit ===
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Please refer to [https://gitlab.com/knx-makerstuff/knx_microbcu2/-/wikis/home MicroBCU2 Project on Gitlab]
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 ===
 
For bus current consumption up to 20mA, J3 must be closed (This is the default, closed by a 0R resistor).
 
 
 
For bus current consumption of 10mA or less, J3 can be open.
 
 
 
=== Schematic ===
 
 
 
=== KiCad ===
 
 
 
 
 
 
 
== Developer Documentation ==
 
 
 
 
 
 
 
  
 
== Links ==
 
== Links ==
  
 
[https://knx-user-forum.de/forum/projektforen/konnekting/1550342-sehr-g%C3%BCnstige-micro-bcu-lite-als-bausatz-interesse Vorstellungs- / Entwicklunsthread im KNX User Forum]
 
[https://knx-user-forum.de/forum/projektforen/konnekting/1550342-sehr-g%C3%BCnstige-micro-bcu-lite-als-bausatz-interesse Vorstellungs- / Entwicklunsthread im KNX User Forum]
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 +
[https://knx-user-forum.de/forum/projektforen/konnekting/1575881-sammelbestellung-microbcu2-knx-transceiver-für-ardunio-raspberry-co 1. Sammelbestellung im KNX User Forum]
  
 
[https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjZ_46X2aftAhUxvlkKHbOJCF4QFjAAegQIBBAC&url=https%3A%2F%2Fwww.onsemi.com%2Fpub%2FCollateral%2FNCN5120-D.PDF&usg=AOvVaw0KUimWgup68HXisop9pYTW OnSemi NCN5120 Datasheet]
 
[https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjZ_46X2aftAhUxvlkKHbOJCF4QFjAAegQIBBAC&url=https%3A%2F%2Fwww.onsemi.com%2Fpub%2FCollateral%2FNCN5120-D.PDF&usg=AOvVaw0KUimWgup68HXisop9pYTW OnSemi NCN5120 Datasheet]
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 +
[https://gitlab.com/knx-makerstuff/knx_microbcu2/-/wikis/home MicroBCU2 on GitLab]
  
 
[[Category:Device/Kits]]
 
[[Category:Device/Kits]]

Latest revision as of 12:16, 10 February 2021

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 a compact bus coupling unit for KNX building automation based on the NCN5120 knx transceiver. It serves as a power supply and UART access to KNX bus.

Hardware

  • IC: NCN5120 (ready for NCN5121 / 5130)
  • Size: 23 x 19 x 9 mm
  • Weight: about 4g
  • Voltage 1: 3.3V
  • Voltage 2 (optional): 5V (default), can be changed: 3.3V - 21V
  • Ripple at VCC1+2: about 50mV
  • Max. current: up to 100mA
  • UART: 19200bps 8E1 / 3.3V

User Documentation

Please refer to MicroBCU2 Project on Gitlab

Links

Vorstellungs- / Entwicklunsthread im KNX User Forum

1. Sammelbestellung im KNX User Forum

OnSemi NCN5120 Datasheet

MicroBCU2 on GitLab