DRV8880_15 Datasheet, PDF (20/48 Pages) Texas Instruments – DRV8880 2-A Stepper Motor Driver With AutoTune™

DRV8880
SLVSD18A – JUNE 2015 – REVISED JULY 2015
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7.3.5 Decay Modes
A fixed decay mode is selected by setting the tri-level DECAYx pins as shown in Table 7. Please note that if the
ATE pin is logic high, the DECAYx pins are ignored and AutoTune is used.
DECAY1
0
0
1
1
0
1
Z
Z
Z
Table 7. Decay Mode Settings
DECAY0
0
1
0
1
Z
Z
0
1
Z
INCREASING STEPS
Slow Decay
Slow Decay
Slow Decay
Mixed Decay: 30% Fast
Slow Decay
Slow Decay
Mixed Decay: 1 t_BLANK
Mixed Decay: 60% Fast
Fast Decay
DECREASING STEPS
Slow Decay
Mixed Decay: 2 t_BLANK
Mixed Decay: 30% Fast
Mixed Decay: 30% Fast
Mixed Decay: 60% Fast
Fast Decay
Mixed Decay: 30% Fast
Mixed Decay: 60% Fast
Fast Decay
Increasing and decreasing current are defined in the chart below. 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 increasing step decay mode is always used.
Figure 15. Definition of Increasing and Decreasing Steps
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