Data Sheet

DMOS Microstepping Driver with Translator
and Overcurrent Protection
A4988
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Figure 2. Missed steps in low-speed microstepping
Figure 3. Continuous stepping using automatically-selected mixed stepping (ROSC pin grounded)
t → , 1 s/div.
Step input 10 V/div.
Mixed Decay
No Missed
Steps
I
LOAD
500 mA/div.
t → , 1 s/div.
Step input 10 V/div.
Slow
Decay
Slow
Decay
Slow
Decay
Slow
Decay
Mixed
Decay
Mixed
Decay
Mixed
Decay
Mixed
Decay
Missed
Step
Voltage on ROSC terminal 2 V/div.