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A4988 is a micro-stepping bipolar stepper driver module. The motor driver module has features like adjustable current limiting, overcurrent protection, overtemperature protection, and five different micro-steps resolutions. It delivers approximately 1 Amp with supply from 8 V to 35 V. There are no phase sequence tables, the high-frequency control interface programming etc. The application of A4988 interface is very suitable for a complex microprocessor is not available or overload. In the stepping operation, the chopping control in the A4988 automatically selects the current decay mode (slow or mixed). The mix decay current control scheme can reduce the audible motor noise, increased step accuracy, and reduced power consumption. In Mixed decay mode, the device is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time. Mixed decay current control results in reduced audible motor noise, increased step accuracy, and reduced power dissipation
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