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DRV8805: DRV8805无输出

Zhang Tianli
Part Number: DRV8805


TI工程师您好，我用DRV8805驱动一个单极性小步进电机，电机应该没有问题，公共端到其他4跟线的阻值都是250欧左右。nFAULT输出为高电平，STP和DIR加的都是TTL信号，电机无动作，VM和OUT1 OUT2 OUT3 OUT4对GND都是12V，把电机除了公共端的4跟线和OUT1~OUT4的所有组合都试了现象也一样，请指教，谢谢！！