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DRV8432: 驱动2相步进电机

Part Number: DRV8432
Other Parts Discussed in Thread: DRV8462, DRV8412

请问这个驱动芯片驱动两相步进电机时,有4个输入PWMA~PWMD ,这4个输入MCU端怎么给呢?我印象中步进电机的驱动芯片时有step引脚的,一个脉冲对应一个步距角。