Hi Cory,
What is the voltage you plan to supply to the DRV8818? What is the stepper motor current requirements?
If you are supplying <7.5V to the DRV8818 VM pin, the voltage is below the undervoltage value and may disable the outputs. There are other devices available for lower voltage ranges. The DRV8846 can operate from 4 to 18V while the DRV8834 can operate from 2.7 to 10.8V.
What is the voltage you plan to supply to the DRV8818? What is the stepper motor current requirements?
If you are supplying <7.5V to the DRV8818 VM pin, the voltage is below the undervoltage value and may disable the outputs. There are other devices available for lower voltage ranges. The DRV8846 can operate from 4 to 18V while the DRV8834 can operate from 2.7 to 10.8V.