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DRV8308EVM: FGOUT输出的精度

Part Number: DRV8308EVM

使用8308驱动电机,使用AEDR-9930编码器采集转速值误差在0.08%,同时用FGOUT信号计算转速误差在1.5%,请问是什么原因,FGOUT的精度是多少?