Stepper motor drive circuit schematic diagram of dedicated integrated chip

An example of a driving circuit using a dedicated integrated chip PMM8713 is shown in the figure. The motor speed is determined by the input pulse frequency at the Ck terminal. When the U/D terminal inputs 0 or 1, the motor is rotated forward or reversed, and the pulse signal is applied to control the motor. When inverting, use Cc and Cd terminals, and Cr and U/D terminals connected to Vss.PMM8713 input terminal Φc is to determine motor phase number, Φc=0 for 3 phases, Φc=1,5 phase for 4 phases When using PMM8714.Ea and 0, Eb is the excitation mode, Ea=Eb=1 for 2-phase excitation, Ea=Eb=1 for 1-2 phase excitation, Ea=0, Eb=1 for 1-phase excitation. Or Ea=1, Eb=0, the output current of the PMM8713 is small, so the current amplifier circuit should be connected when driving the motor.