MakerBot BotStep17 REVE

thingiverse

The BotStep17 plugs into the MightyBoard to control the stepper motors on your MakerBot Replicator. Designed by Harry Mulliken. This is part of The MakerBot Replicator, which you can find at http://www.thingiverse.com/thing:18813 Instructions Botstep17 Specification Controller Chip Allegro A4928 Max. Motor Voltage VBB 28V Max. Logic Voltage VDD 5.5V Max. Power Dissipation (no heatsink) 2.0 W Default Vref voltage VDD x 0.267 +- 2% Default Motor current Vref/2.16 +-10% Rosc GND (mixed decay mode) MS1 MS2 Microstep Resolution Excitation Mode L L Full Step 2 Phase H L Half Step 1-2 Phase L H Quarter Step W1-2 Phase H H Sixteenth Step 4W1-2 Phase Table 1. Microstep Resolution Truth Table Fixed by internal resistors 33K to VDD, 12K to GND, May be changed on pin VR ** Imax = Vref/(8x0.27) *** Fixed by internal 0 ohm res.