CPU Load Step Experiment Description

SAMA7G54-EK is placed in the oven at TA = 70°C and the SAMA7G54 junction temperature evolution is measured when the system switches from a first state to a second one. The first state is Use Case 1 described above where Linux prompts for a command to be entered. The steady state junction temperature for state 1 is TJ = 86.5°C. State 2 is reached by launching a “dummy loop” that loads the CPU up to 100%. The temperature acquisition is made every two seconds, which is slow but still fast enough to capture the temperature variation in the device.

This load step scenario is measured twice with Linux thermal control mechanisms first disabled, then enabled (see Appendix A).