A3984 查看數據表（PDF） - Allegro MicroSystems

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A3984

DMOS Microstepping Driver with Translator

Allegro MicroSystems 

A3984

DMOS Microstepping Driver with Translator

Features and Benefits

▪ Low RDS(ON) outputs

▪ Automatic current decay mode detection/selection

▪ Mixed and Slow current decay modes

▪ Synchronous rectification for low power dissipation

▪ Internal UVLO and thermal shutdown circuitry

▪ Crossover-current protection

Package: 24-pin TSSOP with exposed

thermal pad (suffix LP)

Description

The A3984 is a complete microstepping motor driver with

built-in translator for easy operation. It is designed to

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

sixteenth-step modes, with an output drive capacity of up to

35 V and ±2 A. The A3984 includes a fixed off-time current

regulator which has the ability to operate in Slow or Mixed

decay modes.

The translator is the key to the easy implementation of the

A3984. Simply inputting one pulse on the STEP input drives

the motor one microstep. There are no phase sequence

tables, high frequency control lines, or complex interfaces to

program. The A3984 interface is an ideal fit for applications

where a complex microprocessor is unavailable or is

overburdened.

The chopping control in the A3984 automatically selects

the current decay mode (Slow or Mixed). When a signal

occurs at the STEP input pin, the A3984 determines if

that step results in a higher or lower current in each of the

motor phases. If the change is to a higher current, then

the decay mode is set to Slow decay. If the change is to a

lower current, then the current decay is set to Mixed (set

Not to scale

Continued on the next page…

Pin-out Diagram

CP1 1

CP2 2

VCP 3

VREG 4

MS1 5

MS2 6

RESET 7

ROSC 8

SLEEP 9

VDD 10

STEP 11

REF 12

24 GND

23 ENABLE

22 OUT2B

21 VBB2

20 SENSE2

19 OUT2A

18 OUT1A

17 SENSE1

16 VBB1

15 OUT1B

14 DIR

13 GND

26184.30E

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