A4988SETTR-T Motor Driver IC
 A4988SETTR-T device package |
 A4988SETTR-T schematic symbol |
Motors are one of the most commonly used electrical devices in the world. They are commonly used in all types of industrial, commercial and consumer electronic applications. In fact, the second industrial revolution was kick started due to the invention of motors and electrical machines. There are many different types of motors such as induction motors, synchronous motors, BLDC motors, servo motors and stepper motors. The stepper motors are very widely used in robotics and automatic machinery. In a stepper motor based system, the control circuit of the motor is of great importance. Without efficient and accurate control, the motor cannot deliver the required performance. The motor driver ICs are commonly used to control the power circuit of the motors. The motor driver ICs simplify the control circuit and provide control signals for driving the motor.
What is A4988SETTR-T？
The A4988SETTR-T is a micro-stepping stepper motor driver IC from Allegro MicroSystems. The device features a built in micro-stepping translator for simple operation. The bipolar stepper motor driver is capable of driving the motors in full, half, quarter, 8th and 16th step modes. The device exhibits a drive capacity of 35V and 2A. The device also features a fixed off-time current regulator which is able to operate in slow or mixed decay modes. By eliminating the need for phase sequence tables, high frequency control lines and complex interfaces, this driver implements a very simple control interface. This driver IC is ideal for applications where a power processor is not available. The mixed decay mode of the device results in reduced noise, increased accuracy, and reduced power dissipation.
Pin Configuration
The pin configuration of the A4988SETTR-T stepper motor driver is given in the table below:
| Pin name | Pin description |
| CP1, CP2 | Charge pump flying capacitors |
| GND | Ground |
| VBB1, VBB2 | Bridge A and B power supplies |
| VCP | High side gate drive voltage |
| VREF | Reference voltage |
| ROSC | Timing set |
| DECAY | Decay mode pin |
| DIR | Direction input |
| MS1, MS2, MS3 | Micro-stepping mode 1,2,3 |
| ENABLE, RESET, SLEEP | Enable, reset, sleep pins |
| OUT1A, OUT2A, OUT1B, OUT2B | Bridge A and bridge B outputs |
| SENSE1, SENSE2 | Bridge A and B ground |
Features
- Automatic current decay mode detection
- Mixed and slow current decay modes
- Synchronous rectification for low power consumption
- Internal UVLO
- Cross-over current protection
- 3V and 5V compatible logic supply
- Thermal shutdown
- Short-ground protection
- Five selectable micro-stepping modes up to 1/16th
Applications
The applications of A4988SETTR-T stepper driver are provided as following:
- ATM machines
- Money handling machines
- Video security cameras
- Printers
- Scanners
- Office equipment
- Factory automation
- Gaming machines
- Robotic applications
Specifications
The major technical specifications of the A4988SETTR-T stepper driver are provided as following:
- Max supply voltage: 35V
- Max drive current: 2A
- Logic supply voltage: -0.3 to 5.5V
- Reference voltage: 5.5V
- Supply current: 4mA
- Sleep mode supply current: 10uA
Alternatives
TB62269FTAG; TB62269FTG; TB67S269FTG;
How A4988SETTR-T work?
The A4988SETTR-T is a stepper motor driver IC from Allegro Microsystems which is meant for driving the bipolar stepper motors. This IC allows micro-stepping up to 1/16th step. These ICs are very widely used for stepper motor control in a variety of applications.
The typical application circuit of this IC is provided in the figure below:
A4988SETTR-T application circuit
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