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TIDM-02003 hardware design

Other Parts Discussed in Thread: TIDM-02003

Dear team,

I am using http://www.ti.com.cn/tool/cn/TIDM-02003 . I have a hardware question about the GND of TIDM-02003.

Why is the external ultrasonic signal transmission and reception processing part of the circuit ground in the  board treated like this?

BR,

Susan

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