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AMC1302-Q1: High side current sensing confusion

Part Number: AMC1302-Q1
Other Parts Discussed in Thread: AMC1302,


As the datasheet of AMC1302-Q1 describes, the AMC1302 can be used for high-side current measurement. So the common-mode voltage of AMC1302 should be up to the high-side line voltage at least, right?

But the Vcm range of AMC1302 is from -0.032V to (VDD1-2.2)V, why it can be used for high-side current measurement?