A3981

更新时间： 2024-11-09 12:51:19

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
42页	943K
描述
Automotive, Programmable Stepper Driver

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A3981 数据手册

A3981

Automotive, Programmable Stepper Driver

Description

Features and Benefits

TheA3981isaflexiblemicrosteppingmotordriverwithbuilt-in

• Peak motor current up to ±1.4 A, 28 V

translatorforeasyoperation.Itisasingle-chipsolution,designed

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

sixteenth-step modes, at up to 28 V and ±1.4 A. The A3981

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.

• Low R_DS(on)outputs, 0.5 Ω source and sink, typical

• 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

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.

Applications

• Automotive stepper motors

• Engine management

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.

• Headlamp positioning

Package: 28-pin TSSOP with exposed

thermal pad (suffix LP)

The outputs are protected from short circuits, and features

for low load current and stalled rotor detection are included.

Chip-levelprotectionincludes:hotandcoldthermalwarnings,

overtemperature shutdown, and overvoltage and undervoltage

lockout.

TheA3981 is supplied in a 28-pin TSSOPpower package with

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

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

Not to scale

Typical Applications

Automotive

12V Power Net

Automotive

12V Power Net

Logic

Supply

Logic

Supply

CP1 CP2

VDD

STEP

DIR

MS0

MS1

ENABLE

RESETn

DIAG

CP1 CP2

VDD

STEP

DIR

MS0

MS1

ENABLE

RESETn

DIAG

VCP VBB

OAP

VCPVBB

OAP

OAM

Micro-

controller

Micro-

controller

Stepper

Motor

Stepper

Motor

REF

OBP

OBM

OBP

OBM

SDI

ECU

SDO

SCK

STRn

SDO

SCK

STRn

VREG

SENSA

SENSB

SENSA

SENSB

OSC

AGND PGND

Serial Interface Control

Parallel Control

A3981-DS, Rev. 4

12 3 4 5 6 7...42

中文翻译

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与A3981相关器件

型号	品牌	获取价格	描述	数据表
A3981_V	ALLEGRO	获取价格	Automotive, Programmable Stepper Driver
A3981KLP-T	ALLEGRO	获取价格	暂无描述
A3981KLPTR-T	ALLEGRO	获取价格	Stepper Motor Controller, PDSO28, 9.70 X 4.40 MM, 1.20 MM HEIGHT, LEAD FREE, MO-153AET, TS
A3982	ALLEGRO	获取价格	DMOS Stepper Motor Driver with Translator
A3982_13	ALLEGRO	获取价格	DMOS Stepper Motor Driver with Translator
A3982SLB	ALLEGRO	获取价格	DMOS Stepper Motor Driver with Translator
A3982SLB-T	ALLEGRO	获取价格	DMOS Stepper Motor Driver with Translator
A3982SLBTR-T	ALLEGRO	获取价格	Stepper Motor Controller, 2A, NMOS, PDSO24, LEAD FREE, MS-013AD, SOIC-24
A3983	ALLEGRO	获取价格	DMOS Microstepping Driver with Translator
A3983_08	ALLEGRO	获取价格	DMOS Microstepping Driver with Translator

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