These provide the following features to the user: This will either be 0-5V or 0-3.3V, based on the logic selection. Changes in state from HIGH to LOW or LOW to HIGH only take effect on the next rising edge of the STEP command. This pin determines the direction of motor rotation. Direction and size of step is controlled by DIR and MSx pin settings. Any transition on this pin from LOW to HIGH will trigger the motor to step forward one step. See truth table below for HIGH/LOW functionality. When pulled LOW, outputs are disabled and power consumption is minimized. 70mA max is required for Easy Driver functionality. This pin can be used to power external circuitry. There are also pins across the bottom of the board. If set to LOW, all FETs will be enabled, allowing motor control. If set to HIGH, the FETs will be disabled, and the IC will not drive the motor. Enables the FET functionality within the motor driver. Must be pulled HIGH to enable STEP control. When set LOW, all STEP commands are ignored and all FET functionality is turned off. Mixed decay occurs at 0.21Vcc< PFD < 0.6Vcc. If PFD < 0.21Vcc, fast decay mode is activated. If PFD > 0.6Vcc, slow decay mode is activated. PFD - Voltage input that selects output current decay mode. Half of connection point for bi-polar stepper motor coil B. Half of connection point for bi-polar stepper motor coil A.
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