DRV8886AT Datasheet, PDF (19/40 Pages) Texas Instruments – 2-A Stepper Motor Driver With Integrated Current Sense and AutoTune Technology

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DRV8886AT
SLVSDO1 – JANUARY 2017
7.3.6 Decay Modes
The DRV8886AT decay mode is selected by setting the quad-level DECAY pin to the voltage range listed in
Table 6. The decay mode setting is latched on device enable.
DECAY
100 mV
Can be tied to ground
300 mV, 15 kΩ to GND
1.0 V, 45 kΩ to GND
2.9 V
Can be tied to DVDD
Table 6. Decay Mode Settings
INCREASING STEPS
DECREASING STEPS
Slow decay
Mixed decay: 30% fast
Mixed decay: 30% fast
AutoTune Ripple Control
Mixed decay: 30% fast
AutoTune Ripple Control
AutoTune Dynamic Decay
AutoTune Dynamic Decay
Figure 17 defines increasing and decreasing current. For the slow-mixed decay mode, the decay mode is set as
slow during increasing current steps and mixed decay during decreasing current steps. In full step mode the
decreasing steps decay mode is always used. In noncircular 1/2-step mode the increasing step decay mode is
used after a level transition (0% to 100% and 0% to –100%). When the level transition is to a similar level (100%
to 100% and –100% to –100%), the decreasing step decay mode is used.
Increasing Decreasing
Increasing Decreasing
AOUT Current
STEP Input
Decreasing
Increasing Decreasing
Increasing
STEP Input
Figure 17. Definition of Increasing and Decreasing Steps
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