The OT alarm is used to signal a need for drastic action. The OT alarm can be cleared with or without hysteresis as described in Lower Alarm Threshold.
The OT alarm is operational in the default state with the OT upper threshold set to approximately 122°C. This setting can be overwritten using the upper alarm threshold register. Write the threshold value into the [15:4] bit field and write 03h into [3:0] bits to activate this value and to activate the lower threshold value defined in the OT lower threshold register. The measured value can be converted to a temperature using the transfer function described the UltraScale Architecture System Monitor User Guide (UG580) [Ref 6].
Note: The PS SYSMON uses the same upper and lower OT threshold registers for both the LPD and FPD temperature channels.