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DRV421的使用问题

Other Parts Discussed in Thread: DRV421

我打算使用DRV421检测交流电流,电流大小预计最大0.3ma。

手册里有个图,我没看明白这左边的跟操场跑道似的的圈是什么?里面插了一个跟导体又是个啥?