a4985 Allegro MicroSystems, Inc., a4985 Datasheet - Page 6

• Manufacturer Part Number: a4985
• Description: Dmos Microstepping Driver With Translator And Overcurrent Protection
• Manufacturer: Allegro MicroSystems, Inc.

A4985
Figure 1. Logic Interface Timing Diagram
RESET, or DIR
MS1, MS2,
STEP
STEP minimum, HIGH pulse width
STEP minimum, LOW pulse width
Setup time, input change to STEP
Hold time, input change to STEP
Table 1. Microstep Resolution Truth Table
MS1
H
H
L
L
Time Duration
DMOS Microstepping Driver with Translator
MS2
H
H
L
L
t
C
Full Step
Half Step
Quarter Step
Eighth Step
Microstep Resolution
t
D
t
A
Symbol
t
t
t
t
A
B
C
D
2 Phase
1-2 Phase
W1-2 Phase
2W1-2 Phase
Excitation Mode
and Overcurrent Protection
Typ.
200
200
1
1
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Unit
μs
μs
ns
ns
t
B
6