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microstep modes to function correctly, the current limit must be set low enough (see
below) so that current limiting gets engaged. Otherwise, the intermediate current
levels will not be correctly maintained, and the motor will skip microsteps.
MS1
MS2
Low
Low
High
Low
Low
High
High
High
High
High
CONTROL INPUTS
Each pulse to the STEP input corresponds to one microstep of the stepper motor in the
direction selected by the DIR pin. Note that the STEP and DIR pins are not pulled to any
particular voltage internally, so you should not leave either of these pins floating in your
application. If you just want rotation in a single direction, you can tie DIR directly to VCC
or GND. The chip has three different inputs for controlling its many power
states: RST, SLP, and EN. For details about these power states, see the datasheet.
Please note that the RST pin is floating; if you are not using the pin, you can connect it
to the adjacent SLP pin on the PCB to bring it high and enable the board.
CURRENT LIMITING
One way to maximize stepper motor performance is to use as high of a voltage as is
practical for your application. In particular, increasing the voltage generally allows for
higher step rates and stepping torque since the current can change more quickly in the
coils after each step. However, in order to safely use voltages above the rated voltage
of a stepper motor, the coil current must be actively limited to keep it from exceeding
the motor's rated current.
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MS3
Low
Low
Low
Low
High
Microstep Resolution
Full step
Half step
Quarter step
Eighth step
Sixteenth step
3
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