A4988_V4 Datasheet, PDF (6/20 Pages) Allegro MicroSystems – DMOS Microstepping Driver with Translator And Overcurrent Protection

A4988
DMOS Microstepping Driver with Translator
And Overcurrent Protection
t_A
t_B
STEP
MS1, MS2, MS3,
RESET, or DIR
t_C
t_D
Time Duration
Symbol Typ.
Unit
STEP minimum, HIGH pulse width
STEP minimum, LOW pulse width
Setup time, input change to STEP
Hold time, input change to STEP
t_A
1
μs
t_B
1
μs
t_C
200
ns
t_D
200
ns
Figure 1. Logic Interface Timing Diagram
Table 1. Microstepping Resolution Truth Table
MS1 MS2 MS3 Microstep Resolution Excitation Mode
L
L
L Full Step
2 Phase
H
L
L Half Step
1-2 Phase
L
H
L Quarter Step
W1-2 Phase
H
H
L Eighth Step
2W1-2 Phase
H H H Sixteenth Step
4W1-2 Phase
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com