I am trying to use XADC on Zynq. Using Vivado hardware manager I look at XADC and see Temp is -273. I checked VCCADC, it is 1.8V as shown in the schematic. I check Arty board, and I can get 25 degrees C. I am afraid all the ADC channels will have the same problem. Does anyone have the same issue or some insight? Thanks, Frank