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电机用DRV8847贴了几块板子做直流电机驱动调试，发现上电后DRV8847默认输出低电平。
已经接了上拉电阻了，负载也接上了，没有过流过热。试了DRV8847EVM，上电后nFAULT也是默认输出低电平，难道是DRV8847开发样品的原因？
