7290-072011-8

TABLE 2

STEP NUMBER

% DUTY CYCLE

PHASES

STEP ANGLE

FULL

1/2

INH1

INH2

PHA

PHB PHC PHD

0

0

100

0

1

0

1

0

HOME

1

70.7

70.7

1

0

1

0

45

1

2

0

100

0

1

1

0

90

3

-70.7

70.7

0

1

1

0

135

2

4

-100

0

0

1

0

1

180

5

-70.7

-70.7

0

1

0

1

225

3

6

0

-100

1

0

0

1

270

7

70.7

-70.7

1

0

0

1

315

0

0

100

0

1

0

1

0

HOME

FIGURE 8. Selecting Between Fast and Slow Decay for One Stepper Motor Winding

(Use identical circuit for the other stepper motor winding)

NOTE:

In fast decay mode, inhibit windings are chopped.

In slow decay mode, phase windings are chopped.

NOR Gates: CD4001

OR Gates: CD4071