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A4988 Series Datasheet

A4988

Driver chip

The A4988 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-，eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A.The A4988 includes a fixed off-time current regulator which has the ability to operate in slow or mixed decay modes.

A4988 Data sheet.pdf

A4988 Pin Configuration and Function

Pin Number	Pin Name	Description
1	OUT2B	DMOS Full Bridge 2 Output B
2	ENABLE	Logic input
3,18	GND	Ground*
4	CP1	Charge pump capacitor terminal
5	CP2	Charge pump capacitor terminal
6	VCP	Reservoir capacitor terminal
7, 20, 25	NC	No connection
8	VREG	Regulator decoupling termina
9	MS1	Logic input
10	MS2	Logic input
11	MS3	Logic input
12	RESET	Logic input
13	Rosc	Timing set
14	SLEEP	Logic input
15	VDD	Logic supply
16	STEP	Logic input
17	REF	m reference voltage input
19	DIR	Logic input
21	OUT1B	DMOSFull Bridge 1 Output B
22	VBB1	Load supply
23	SENSE1	Sense resistor terminal for Bridge 1
24	OUT1A	DMOS Full Bridge 1 Output A
26	OUT2A	DMOS Full Bridge 2 Output A
27	SENSE2	Sense resistor terminal for Bridge 2
28	VBB2	Load supply

A4988 Series Datasheet

Part No

Picture

Manufacturer

Package

Description

Datasheet

A4988SETTR-T

Allegro MicroSystems

QFN

ALLEGRO MICROSYSTEMS A4988SETTR-T Motor Driver/Controller, Stepper, 3V to 5.5V supply, 35V/2A/2Outputs, QFN-28

A4988SETTR

Allegro MicroSystems

DMOS Microstepping Driver