Please update your Quartus® Prime Pro Edition to version 18.1 or higher.
Why does the Temperature Sensor Intel® Stratix® 10 FPGA IP core always read out the value 0xFFFFE700?
https://community.altera.com/kb/knowledge-base/why-does-the-temperature-sensor-intel%C2%AE-stratix%C2%AE-10-fpga-ip-core-always-read-out-/345145
See below for instructions on how to access the TSD.
Intel® Stratix® 10 Analog to Digital Converter User Guide
https://docs.altera.com/r/docs/683612/20.4/stratix-10-analog-to-digital-converter-user-guide/stratix-10-adc-overview
--------------------
Category: IP (TSD)
Tool: Quartus® Prime
Device: Stratix® 10