Low Voltage Stepper and Single/Dual DC Motor Driver

A3906

5

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

FLx

Fault Asserted

Fault Asserted

Fault Asserted

NOTE: Timer resets after each reset of the PWM latch.

Fault Timing Diagram

DC Motor Operation

IN1

IN2

IN3

IN4

OUT1A

OUT1B

OUT2A

OUT2B

Function

0

0

0

0

Off

Off

Off

Off

Disabled

1

0

1

0

High

Low

High

Low

Forward

0

1

0

1

Low

High

Low

High

Reverse

1

1

1

1

Low

Low

Low

Low

Brake

Stepper Motor Operation

IN1

IN2

IN3

IN4

OUT1A

OUT1B

OUT2A

OUT2B

Function

0

0

0

0

Off

Off

Off

Off

Disabled

Disabled

1

0

1

0

High

Low

High

Low

Full Step 1

½ Step 1

0

0

1

0

Off

Off

High

Low

–

½ Step 2

0

1

1

0

Low

High

High

Low

Full Step 2

½ Step 3

0

1

0

0

Low

High

Off

Off

–

½ Step 4

0

1

0

1

Low

High

Low

High

Full Step 3

½ Step 5

0

0

0

1

Off

Off

Low

High

–

½ Step 6

1

0

0

1

High

Low

Low

High

Full Step 4

½ Step 7

1

0

0

0

High

Low

Off

Off

–

½ Step 8

Control Logic