a4980klp-t Allegro MicroSystems, Inc., a4980klp-t Datasheet

a4980klp-t

Manufacturer Part Number

a4980klp-t

Description

Automotive, Programmable Stepper Driver

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A4980KLP-T.pdf (44 pages)

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Features and Benefits

• Typical application up to ±750 mA, 28 V

• Low R

• Automatic current decay mode detection/selection

• Mixed, Fast, and Slow current decay modes

• Synchronous rectification for low power dissipation

• Internal OVLO, UVLO, and Thermal Shutdown circuitry

• Crossover-current protection

• Short circuit, and open load diagnostics

• Hot and cold thermal warning

• Stall detect features

• SPI-compatible or simple Step and Direction motion control

• Highly configurable via SPI-compatible serial interface

Applications

• Automotive stepper motors

• Engine management

• Headlamp positioning

Package: 28-pin TSSOP with exposed

thermal pad (suffix LP)

Not to scale

A4980-DS, Rev. 1

Supply

Logic

DS(on)

Micro-

controller

ECU

outputs, 0.5 Ω source and sink, typical

Serial Interface Control

VDD

STEP

DIR

MS0

MS1

ENABLE

RESETn

DIAG

REF

SDI

SDO

SCK

STRn

VREG

OSC

CP1 2

AGND

VCP

SENSA

SENSB

PGND

OAM

OBM

OAP

OBP

VBB

Automotive, Programmable Stepper Driver

12V Power Net

Automotive

Typical Applications

Stepper

Motor

Description

The A4980 is a flexible microstepping motor driver with built-in

translator for easy operation. It is a single-chip solution, designed

to operate bipolar stepper motors in full-, half-, quarter- and

sixteenth-step modes, at up to 28 V and ±750 mA. The A4980

can be controlled by simple Step and Direction inputs, or

through the SPI-compatible serial interface that also can be

used to program many of the integrated features and to read

diagnostic information.

The current regulator can be programmed to operate in fixed

off-time or fixed frequency PWM, with several decay modes

to reduce audible motor noise and increase step accuracy. In

addition the phase current tables can be programmed via the

serial interface to create unique microstep current profiles to

further improve motor performance for specific applications.

The current in each phase of the motor is controlled through a

DMOS full bridge, using synchronous rectification to improve

power dissipation. Internal circuits and timers prevent cross-

conduction and shoot-through, when switching between high-

side and low-side drives.

The outputs are protected from short circuits, and features

for low load current and stalled rotor detection are included.

Chip-level protection includes: hot and cold thermal warnings,

overtemperature shutdown, and overvoltage and undervoltage

lockout.

The A4980 is supplied in a 28-pin TSSOP power package with

an exposed thermal pad (package type LP). This package is

lead (Pb) free with 100% matte-tin leadframe plating.