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
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.