Logic |
Arduino MEGA compatible Atmega2560 and Atmega32u2 processors are compatible with all RAMPS class firmwares |
Crystals for both usb and mcu (timing accurate to 10ppm) |
4 Thermistor jacks |
All extra pins broken out on both processors (allows using the 32u2 for LUFA AVR programmer, etc.) |
2 channel SDRAMPS compatible SPI breakout |
Motor Drivers |
5 A4982 1/8th microsteps motor drivers with 1,1/2,1/4,1/16 as options (2 connectors on Z for Prusa Mendel) |
Digital Trimpot for stepper current control |
Current limit on driver IC VCC to prevent permanent latchup |
Microstep mode configured by MCU through firmware (no jumpers needed) |
Test points for driver control signals |
Step and Direction pins are on their own ports for synchronous movement capability |
Extra driver ports broke out for up to 3 additional drivers (some of the motor extension pins are shared with max endstop and a pin allocated for SPI-SS extensions) |
PWM DC outputs (Extruders, Fans, Etc.) |
6 outputs |
Low resistance mosfets for cool running |
Indicator led for each channel |
Power |
Three independent power rails |
Heated Bed, 15A 12-35V |
Extruders + fans and logic, 5A 12-35V (fuse can be exchanged for up to 10A capacity) |
Motors, 5A 12-28V (fuse can be exchanged for up to 10A capacity) |
Built in SMPS for 5V generation from 10V-26V Vin |
PCB |
4 layer |
2oz copper on all layers |
High quality, High temperature FR4-TG130 PCB |
Gold ENIG finishing |
Fuses |
3 user replaceable NANO2 fuses |
0448005.MR |
F2: motors and on-board power supply |
F3: extruder heater + fan outputs and logic |
F4: automotive-type 15A ATO bladed fuse to for the heated bed |