Subdivision motor driving circuit for realizing photometer grating direct drive

The invention discloses a subdivision motor driving circuit for realizing photometer grating direct drive. The subdivision motor driving circuit comprises a micro stepping motor driver, wherein the micro stepping motor driver is provided with a working mode configuration port, a bidirectional control port connected with an MCU and an output port connected with a stepping motor; the bidirectional control port comprises a rotation direction control port, a rotation step number setting port, a working state control port and a micro-step resolution setting port; the rotation step number setting port receives the rotation step number of each working state pre-stored and solidified in the MCU after the optocoupler positioning is initialized; and the working state control port configures a corresponding motor subdivision ratio and a micro-step resolution ratio according to actual requirements. The subdivision motor driving circuit is simple in matching and debugging, few in monochromator structural parts, capable of