Other Parts Discussed in Thread: ADS8681
I am using the 3.3V from the PHI board to power another board (Test Board) which is connected to PHI board's signal source. When I connect USB cable of ADS8681 and open the software, this 3.3V is supplied to the Test Board. However when I disconnect the USB cable, the 3.3V reduces to 0 very slowly damaging a transistor in the board.
Can you please assist me on how to solve this and let me know whether it will be possible to cut off the 3.3V from PHI board immediately before disconnecting the ADS8681 board from laptop.