A3979 datasheet(14/15 Pages) ALLEGRO

14 / 15 page

DMOS Microstepping Driver with Translator

A3979

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

Terminal List Table

Number

Name

Description

SENSE1

Sense resistor for Bridge 1

HOME

Logic Output

DIR

Logic input

OUT1A

Output A for Bridge 1

PFD

Mixed decay setting

RC1

Analog input for fixed off-time for Bridge 1

AGND

Analog Ground

REF

Current trip reference voltage input

RC2

Analog input for fixed off-time for Bridge 2

VDD

Logic supply

OUT2A

Output A for Bridge 2

MS2

Logic input

MS1

Logic input

SENSE2

Sense resistor for Bridge 2

VBB2

Load supply for Bridge 2

Logic input

¯R¯¯E¯¯S¯¯E¯¯T¯

Logic input

OUT2B

Output B for Bridge 2

STEP

Logic input

VREG

Regulator decoupling

PGND

Power Ground

VCP

Reservoir capacitor

CP1

Charge pump capacitor 1

CP2

Charge pump capacitor 2

1OUT1B

Output B for Bridge 1

¯E¯¯N¯¯A¯¯B¯¯L¯¯E¯

Logic input

¯S¯¯L¯¯E¯¯E¯¯P¯

Logic input

VBB1

Load supply for Bridge 1

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