Stepper Motor Driver Chip - MS4985

MS4985is a bipolar microstepping motor driver chip with built-in4bit DAC, supporting full-step,1/2，1/4，1/8, four steppingmodes; the chip hasrelativelylarge35V，±1.5Adriving capability.MS4985 It uses pulse-controlled stepping mode. Each pulse applied to theSTEPpinadvances the motor by one microstep; no phase sequence table is needed, norhigh-frequency control lines or complex program control interfaces.In addition,MS4985also features a rectifier with fixed current decay period,which can automatically select the current decay mode: slow decay and mixed decay. In mixeddecay mode, the initial decay period is fast decay, and the remaining time is slow decay.This decay mode helps reduce motor noise, increase stepping accuracy,and lower power consumption.The internal synchronous rectification circuit reduces power consumption. It has built-in over-temperatureprotection, overcurrent protection, under-voltage protection, and short-circuit protection circuits, and the chip doesnot require a special power-on sequence.

I. Features of Stepper Motor Driver Chip MS4985:

Low output on-resistance
Automatic current decay mode selection and detection
Synchronous rectification
Mixed decay and slow decay modes
Compatible with 5V and 3.3V logic inputs
Full-step, 1/2, 1/4, 1/8 microstepping modes
Over-temperature protection, under-voltage protection
Low current sleep mode (<50uA)

II. Applications of Stepper Motor Driver Chip MS4985: