Fernando, The external trigger uses a voltage level translator for the signal the is routed to the FPGA. The input side of this device has an adjustable voltage that allows the device to operate with 1.4V to 3.6V range. The supply that controls this voltage is U32. Switch SW10 is used to set this voltage. The output of the device is fixed. Just set the switch so the part handles the level of the input trigger signal you are providing. Regards, Jim
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