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28335电机套件的PWMDAC

28335套件程序LEVEL3中,Iq设为0.2,使用PWMDAC测量Iq波形,不运行的时候是3.1v,转电机的时候是2.0V,我想请教一下Iq的数字对应PWMDAC引脚几伏?为啥运行前后电压会差这么多