A little Bus Coupler Unit with an UART interface
- IC: NCN5120
- Size: 23 x 19 x 5.4 (10.3) mm
- Voltage 1: 3.3V
- Voltage 2 (optinal): 5V (default), can be changed: 3.3V - 21V
- Max. current: up to 100mA
- UART: 19200bps 8E1
the new version (R1.2) has to connectors:
- 7x pin 2.54mm THT
- 2x4 or 2x5 pin 1.27 SMD
Attention: MicroBCU has no dedicated pins for WAGO terminal (Red/Grey)!
If you solder the MicroBCU yourself, be carefull: On (some?) PCV Rev 1.2 the solder print on the top (NCN-) side is wrong. The two capacitors C5 and C6 in the top right corner are switched - here you can see the correct soldering:
Also be carefull wenn soldering the big capacitor C2: The solder print marks the + side of the capacitor, because this is the standard for tantalum capacitors. If you use aluminium capacitors, the - side is marked.