Place of Origin:
China
Brand Name:
creatall
Model Number:
A4988
A4988 is a complete micro-stepping motor driver with built-in translator for easy operation. This product can operate bipolar stepper motors with full, half, 1/4, 1/8 and 1/16 step modes, with output drive capacity of up to 35 V and ±2A. It includes a fixed off-time current regulator, either in slow or mixed decay modes. A4988 converter is a simplified implementation with no need of phase sequence tables, high frequency control lines or complex interfaces to program. This makes it ideal for use in occasions where a complex microprocessor is unavailable or is overburdened.
In the micro-step operation, A4988's internal chopping control automatically selects the current decay mode (slow or mixed). The mixed decay mode provides a fixed off time for fast decay, and then the rest of the off time is in slow decay. This current control scheme results in reduced audible noise from the motor, higher step accuracy and power conservation.
Power sequencing can be made easy with the internal synchronous rectification control circuitry. This ensures improved pulse-width modulation (PWM) power consumption. Other protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover-current protection.
A4988 comes in a QFN package of 5 mm × 5 mm, with a nominal overall package height of 0.90 mm. The exposed pad at the bottom of the package allows for better thermal dissipation. The Pb(suffix-T) package is covered with 100% matte tin lead frame plating.
Low RDS(On) Output
The device offers a low RDS(on) output to achieve high efficiency and minimal losses.
Automatic Decay Mode Detection / Selection
This device has the facility to detect and select between the various current decay modes automatically.
Mix with Slow Current Decay Modes
By mixing the available slow current decay modes, energy loss can be further reduced.
Synchronous Rectification
The synchronous rectification technology used in the device reduces power dissipation and increases efficiency.
Internal UVLO
The device is designed with an internal Under Voltage Locked Out function to provide protection from low voltage conditions.
Cross-Current Protection
Cross-current protection is also enabled in the device to protect from the overload of current between two motor phases.
3.3 and 5V Compatible Logic Supply
The device supports both 3.3V and 5V logic lines, which can be adjusted according to system requirements.
Ground Fault and Load Short-Circuit Protection
The device also features protection against ground fault and load short-circuit losses.
Optional Step Five Modes
The device also offers an optional five modes of stepping, namely: full, 1/2, 1/4, 1/8, and 1/16.
When using engraving machines or 3D printers, there are basic needs of the stepper motor control pins, like the figure shown above. For the expansion board UNO, these pins correspond to the following: EN (stepper motor drive enable, active low), Z.DIR (Z axis direction control), Y.DIR (Y-axis direction control), X.DIR (X-axis direction control), Z.STEP (Z-axis stepper control), Y.STEP (Y-axis stepper control) and X.STEP (X-axis stepper control).
The following is a simple stepper motor control program:
#define EN 8 // stepper motor enable, active low #define X_DIR 5 // X axis stepper motor direction control #define Y_DIR 6 // y-axis stepper motor direction control #define Z_DIR 7 // z-axis stepper motor direction control #define X_STP 2 // x-axis stepper control #define Y_STP 3 // y-axis stepper control #define Z_STP 4 // z-axis stepper control / * // Function: step function: to control the stepper motor direction, the number of steps. // Parameters: dir direction control, dirPin DIR pin corresponding to the stepper motor, stepperPin step pin corresponding to the stepper motor, stepping a few steps steps // No return value * / void step (boolean dir, byte dirPin, byte stepperPin, int steps) { digitalWrite (dirPin, dir); delay (50); for (int i = 0; i digitalWrite (stepperPin, HIGH); delayMicroseconds (800); digitalWrite (stepperPin, LOW); delayMicroseconds (800); } } void setup () {// the stepping motor used in the IO pin is set to output pinMode (X_DIR, OUTPUT); pinMode (X_STP, OUTPUT); pinMode (Y_DIR, OUTPUT); pinMode (Y_STP, OUTPUT); pinMode (Z_DIR, OUTPUT); pinMode (Z_STP, OUTPUT); pinMode (EN, OUTPUT); digitalWrite (EN, LOW); } void loop () { step (false, X_DIR, X_STP, 200); // X axis motor reversal lap, 200 steps for the circle step (false, Y_DIR, Y_STP, 200); // y-axis motor reversal lap, 200 steps for the circle step (false, Z_DIR, Z_STP, 200); // z-axis motor reversal lap, 200 steps for the circle delay (1000); step (true, X_DIR, X_STP, 200); // X-axis motor is transferred lap, 200 steps to circle step (true, Y_DIR, Y_STP, 200); // y-axis motor is transferred lap, 200 steps to circle step (true, Z_DIR, Z_STP, 200); // z-axis motor is transferred lap, 200 steps to circle delay (1000); }
In this program, one can control the direction, as well as the number of steps for each stepper motor. To enable these control, the setup will set the pins used for the stepper motor in output mode, and turn on the enable, so that the board can start. In the loop, the command of step can control the stepper motor’s direction, number of steps, and it is used for reversing lap and transferring lap.
Creatall's A4988 Driver Board has been specifically designed for V3 Engraving Machines and 3D Printer CNC shields. This board features a 68.6mm*53.4mm size and is a perfect fit for most 3D Printer CNC shields. It can be used to control stepper motors in a reliable and efficient way. The A4988 Driver Board has a wide range of applications and is perfect for prototyping and development of robotics and 3D printing. With its high quality and low price, it is a great choice for any project. The Creatall A4988 Driver Board Series is an ideal choice for any 3D Printer CNC shield project.
Brand Name: creatall
Model Number: A4988
Place of Origin: China
Size: 68.6mm*53.4mm
Type: V3 Engraving Machine
Price: Manufacturer
Series: A4988 Driver Board
This creatall A4988 3D Printer CNC Shield Expansion Board is specially designed for 3D Printer CNC Driver Board. It has a size of 68.6mm*53.4mm, providing an ideal platform for stepper motor driving. It is made of high-quality components and is manufactured in China. The A4988 Driver Board series is highly reliable, ensuring a high-performance 3D Printer CNC shield.
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