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A4988 Stepper Motor Driver
Allegro MicroSystems
The A4988 is a microstepping bipolar stepper motor driver carrier. STEP/DIR pins advance the motor; MS1-MS3 select full to 1/16 microstepping; a trim pot sets the coil current limit. Widely used on 3D printers and CNC.
In stock
Specifications
0No specs listed.
Pinout
16| Pin | Name | Functions | Notes |
|---|---|---|---|
| 1 | ENABLE | GPIO | Active-low driver enable |
| 2 | MS1 | GPIO | Microstep select 1 |
| 3 | MS2 | GPIO | Microstep select 2 |
| 4 | MS3 | GPIO | Microstep select 3 |
| 5 | RESET | GPIO | Active-low reset (tie to SLEEP if unused) |
| 6 | SLEEP | GPIO | Active-low sleep |
| 7 | STEP | GPIO | One pulse = one (micro)step |
| 8 | DIR | GPIO | Rotation direction |
| 9 | VMOT | POWER | Motor supply 8-35V (add 100uF cap) |
| 10 | GND | GND | Motor ground |
| 11 | 2B | — | Coil 2 output B |
| 12 | 2A | — | Coil 2 output A |
| 13 | 1A | — | Coil 1 output A |
| 14 | 1B | — | Coil 1 output B |
| 15 | VDD | POWER | Logic supply 3-5.5V |
| 16 | GND | GND | Logic ground |
Interactive pinout
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