Rabbit RCM3365 User Manual page 103

Figure B-11 shows the stepper-motor driver circuit.
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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
User's Manual
PF4 ENABLE1
PF5
ENABLE2
PF6 ENABLE1
PF7 ENABLE2
Figure B-11. Stepper-Motor Driver Circuit
Pins Connected
1–2
Onboard power supply to U2
9–10
3–4
External power supply to U2
7–8
1–2
Onboard power supply to U3
9–10
3–4
External power supply to U3
7–8
U2
IN1 OUT1
2 3
1
IN2 OUT2
7 6
OUT3
IN3
10 11
9
OUT4
IN4
15 14
L293DN
U3
IN1 OUT1
2 3
1
OUT2
IN2
7 6
IN3 OUT3
10 11
9
OUT4
IN4
15 14
L293DN
J3
VMA+
1
MDA1 {
2
MOTOR +
MDA2
3
{
MDA3
4
MOTOR –
MDA4
5
VMA-
6
J4
VMB-
1
MDB1 {
2
MOTOR +
MDB2
3
{
MDB3
4
MOTOR –
MDB4
5
VMB+
6
Factory
Default
×
×
97