Automotive, Sensorless BLDC Controller

A4960

10

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

X

X

X

X

X

C

A

B

D

E

J

K

F

I

G

0

D

4

1

D

5

1

D

’

0

D

’

4

1

D

’

5

1

D

STRN

SCK

SDI

SDO

H

X=don’t care, Z=high impedance (tri-state)

Z

Z

Figure 1. Serial Interface Timing (letters A through K are referenced in the Electrical Characteristics table, Logic

Inputs and Outputs – Dynamic Parameters section)

Figure 2. Gate Drive Output Timing – PWM Input

Figure 3. PWM Brake Timing

PWM

GLx

GHx

PWM

Run

PWM Off

Brake

GHx

GLx

PWM

Disabled

Disabled

Active

Active

Disabled

Active

Operation Timing Diagrams