A3981 Allegro Micro Systems, Inc., A3981 Datasheet - Page 32

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

A3981
Terminal List Table
ENABLE
Name
AGND
DIAG
OAM
OBM
MS0
MS1
OAP
OBP
OSC
CP1
CP2
PAD
DIR
Number Description
24
23
16
26
13
12
25
18
11
7
3
4
5
–
Analog reference ground
Charge pump capacitor terminal
Charge pump capacitor terminal
Diagnostic output
Direction select input
Bridge enable input
Microstep select input
Microstep select input
Bridge A negative output
Bridge A positive output
Bridge B negative output
Bridge B positive output
Oscillator input
Connect exposed tab to ground
SENSA
SENSB
AGND
STRn
OAP
O
VDD
OBP
SCK
MS1
MS0
REF
DIR
SDI
S
C
Automotive, Programmable Stepper Driver
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Pin-out Diagram
VDD
Ref
RESETn
Reg
SENSB
SENSA
Name
PGND
VREG
STEP
VBBA
VBBB
STRn
SDO
REF
SCK
VCP
VDD
SDI
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VBBA
RESETn
ENABLE
OAM
C
CP1
VCP
PGND
VREG
STEP
OBM
SDO
DIAG
VBBB
Number Description
P
2
21
27
17
14
19
28
15
22
10
20
8
9
6
1
2
Power Ground
Reference input voltage
Chip reset
Serial data clock
Serial data input
Serial data output
Current sense node – bridge A
Current sense node – bridge B
Step input
Serial data strobe
Motor supply – bridge A
Motor supply – bridge B
Above supply voltage
Logic Supply
Regulated voltage
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
32