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Part Number: LDC1612EVM

I am using LDC1612EVM for very small metal detection.  When used with USB power, connecting USB cable to PC USB port, It works as expected. Is  it safe if I  connect external +5V power supply to power lines of USB cables  and only two Data lines connected to PC ? Will PC  USB port detect the device ? Do I need to short GND line from PC side to GND of external power supply ?