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For some applications where microstepping at very low speeds is
necessary, the lack of back EMF in the winding causes the current to
increase in the load quickly, resulting in missed steps. This is shown
in Figure 2. By pulling the ROSC pin to ground, mixed decay is set
to be active 100% of the time, for both rising and falling currents, and
prevents missed steps as shown in Figure 3. If this is not an issue, it
is recommended that automatically-selected mixed decay be used,
because it will produce reduced ripple currents. Refer to the Fixed
Off-Time section for details
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