Figure B-11 shows the stepper-motor driver circuit.
U2
VMA+
1
J3
?
PF4
PF5
IN1
ENABLE1
IN2
IN3
ENABLE2
IN4
2
1
7
10
9
15
3
6
11
14
OUT1
OUT2
OUT3
OUT4
MDA1
MDA2
MDA3
MDA4
2
3
4
5
{
{
MOTOR +
MOTOR ?
L293DN
VMA-
6
U3
VMB-
1
J4
?
PF6
PF7
IN1
ENABLE1
IN2
IN3
ENABLE2
IN4
2
1
7
10
9
15
3
6
11
14
OUT1
OUT2
OUT3
OUT4
MDB1
MDB2
MDB3
MDB4
2
3
4
5
{
{
MOTOR +
MOTOR ?
VMB+
6
L293DN
Figure B-11. Stepper-Motor Driver Circuit
The stepper motor(s) can be powered either from the onboard power supply or from an
external power based on the jumper settings on headers JP1 and JP2.
Table B-3. Stepper Motor Power-Supply Options
Header
JP1
JP2
1–2
9–10
3–4
7–8
1–2
9–10
Pins Connected
Onboard power supply to U2
External power supply to U2
Onboard power supply to U3
Factory
Default
×
×
User ’s Manual
3–4
7–8
External power supply to U3
91
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