maximum CPU temperature

[victor]

Hi, In your documentation you specify the maximum CPU temperature 85 DegC. What problems could one expect after this point? How much safety margain du you have on this number? If I run the CPU at 90-100DegC, should I expect any problems?

[syntroniks]

Yes, the thermal conductivity between die and package as well as the thermal conductivity between package and ambient need to be factored in.

Knowing these, and the power dissipation of the microcontroller, you can estimate die temperature. Alternatively, you may use any onchip temperature sensors (usually a bandgap voltage if I remember right) to measure die temperature.

Many silicon manufacturers list a 125C-150C maximum die temperature. Operation near and above that can cause unexpected operation. An analogy would be running your microcontroller at 1.1 volts. It MAY work, but it MAY not.

Practically I wouldn't envision problems running at 100C ambient but I would never release a design to manufacture that operates in those conditions.

[Hung Bui]

@victor: We have some variant that is recently qualified for the temperature range of -40 to 105oC. Please have a look here