Re: Operating temperature derating

On 6/12/24 12:26 PM, Don Y wrote:
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It's been above 100F (38C) for 16 days, already.  People are still working
their normal outdoor jobs, looking at cars on dealer lots, walking 100 yards
across uncovered parking lots to gain entry to stores, etc.
 Are phones NOT expected to work in these environments?  (Gee, I wanted to
telephone emergency services to get help for my buddy who collapsed in
the heat but it was too hot for my phone to make the call)

The phones may not stop working but may not meet performance specifications. For example applications may not work as fast as at lower temperatures.
I've never heard of lower level software being compromised at high temperatures so basic phone calls would be ok but action video games would run slower.
The ASICs I worked on had a -25C to +75C operating range. When the CPU was idle the phone would be too hot to hold if the internals were at 75C.

We expect cars to continue to operate in those temperatures.  What's the
criteria that we use to determine what should and shouldn't be expected
to remain operational?

Automotive devices that expect to be in the engine compartment are designed for -40C to +125C or +150C.
kw
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