D15

RTB_D15

My Homebrew D15 decoder is a drop in replacement for the original analog Minitrix (#11130) PCB. The decoder is designed to integrate into the RTB digital control infrastructure.

See also

• RTB_D12 - custom (Fleischmann V100)
• RTB_D13 - custom (Minitrix coach)
• RTB_D16 - NEM651
• RTB_D20 - NEM651
• RTB_D21 - Next18
• RTB_D22 - Plux16
• RTB_D23 - NEM652

User Guides

• User Guide - DE
• User Guide - EN

Decoder features

• Minitirx V160 PCB decoder
• DCC
  • DCC-A automatic logon
  • DCC-R protocol extension
  • Service Mode Programming
• Railcom
  • Channel 1/2
  • POM, xPOM
  • DYN: Speed, QoS, Track-voltage, Motor-current, AUX-current, Temp, Distance travelled
• 7-18V track voltage
• heartbeat LED
• adjustable max motor current (default 250mA)
• adjustable max AUX current (default 250mA)
• over temp protection
• Function output: LF/LR (dimmable, 1.4kHz), LED on PCB
• Function output: AUX1/AUX2 (dimmable, 1.4kHz) for driver cabin (LEDs on PCB)
• Function output: AUX3/AUX4 logic level
• Function output: AUX5/AUX6 open drain (each 250mA)
• buffer capacitor 4x330uF
• optional 9-axis orientation sensor
• <10mA idle power consumption
• Firmware update over main tracks via DCC-R protocol

Hardware

The current PCB layout uses SMD footprints with 0.5mm pitch and mainly 0402 parts. Reflow soldering is mandatory whereas handsoldering almost impossible.

PCB

• 4-layer PCB, FR4, 0.8mm
• CPU: AVR64DA32
• Motor bridge: DRV8231
• Inrush limiter: TPS22810
• 9-axis absolute-orientation sensor: BNO055

Kicad

Schematic | Layout | Gerber

Dependency

:yellow_circle: Requires my Kicad project library RTB_SamacSys in the same directory tree.

Firmware

Filename structure: { pcb }{ code }{ version }.hex

Example: D15F0001.hex

Firmware files

Images

YouTube

See the D15 decoder (rev 0) in action.

This project is intended for hobby use only and is distributed in accordance with the Apache License 2.0 agreement.