// Motor Drivers

A4988 Stepper Driver

The A4988 is a microstepping stepper motor driver that can drive bipolar stepper motors with up to 2A per coil. Supports full, half, quarter, eighth, and sixteenth step modes. Commonly used in 3D printers and CNC machines.

// Specifications

Motor Voltage

8V – 35V

Output Current

Up to 2A per coil

Step Modes

Full, 1/2, 1/4, 1/8, 1/16

Logic Voltage

3.3V – 5V

Package

Module (16-pin carrier)

Protection

Thermal shutdown, overcurrent

// Pin Reference Table

Pin	Name	Function	Type
ENABLE	ENABLE	Enable driver, active low	I/O
MS1	MS1	Microstep select bit 1	I/O
MS2	MS2	Microstep select bit 2	I/O
MS3	MS3	Microstep select bit 3	I/O
RESET	RESET	Reset, active low	I/O
SLEEP	SLEEP	Sleep mode, active low	I/O
STEP	STEP	Step input, pulse to step	I/O
DIR	DIR	Direction select	I/O
GND	GND	Ground	GND
VDD	VDD	Logic supply 3.3V–5V	PWR
1B	1B	Coil 1B output	I/O
1A	1A	Coil 1A output	I/O
2A	2A	Coil 2A output	I/O
2B	2B	Coil 2B output	I/O
VMOT	VMOT	Motor supply 8V–35V	PWR
VREF	VREF	Current limit reference	ADC