A3981 Allegro Micro Systems, Inc., A3981 Datasheet - Page 7

• Manufacturer Part Number: A3981
• Manufacturer: Allegro Micro Systems, Inc.

A3981
Figure 1. Serial Interface Timing Diagram
Figure 2. Control Input Interface Timing Diagram
STEP
STRn
DIR, MS0, MS1
SDO
SCK
SDI
ENABLE*
RESETn
F
STEP
Z
Key
B
C
D
E
G
A
F
C
X
*
Clock High Time
Clock Low Time
Strobe Lead Time
Strobe Lag Time
Strobe High Time
Data Out Enable Time
Data Out Disable Time
ENABLE(Pin) OR RUN[EN] bit
J
D
Characteristic
1
t
D
' 5
EN
1
5
K
A
I
Automotive, Programmable Stepper Driver
X
B
H
t
SU
D
D
1
4
1
' 4
Key
M
H
K
X
J
L
Z
I
t
H
Data Out Valid Time from Clock Falling
Data Out Hold Time from Clock Falling
Data In Set-Up Time to Clock Rising
Data In Hold Time From Clock Rising
STEP Rising to STRn Rising Setup Time
STEP Rising from STRn Rising Hold Time
“Don’t care”
High-impedance (tristate)
t
STPH
X
Characteristic
D
D
0
' 0
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
D
D15=1 and D14=0
L
No rise when
t
STPL
X
E
M
G
Z
7