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AM3517: Temperature specifications questions

Quentin Lewis
Prodigy 70 points

Part Number: AM3517

We have a shipping product based on the Logic PD AM3517 SOM module (SOMAM3517-10-1780RJCR) which contains an AM3517 processor. Their datasheet describes as a commercial temperature rated device. (70 degrees C max). 


How do do you characterize that ambient with respect to air temperature at what distance and with what sort of flow? Does this assume any airflow? Is there a MAX "case temperature" spec for the processor that I might reference so that I might take a clear attached thermocouple measurement to clear up my thermal environment questions?

I ask because I see both network and USB issues as temperatures rise. (though are still below the 70c limit....the way I measure it) These also get far worst with lower voltage......so I wonder if my thermal environment might actually be higher than I think.

  • 0
    TI__Guru**** 393215 points
    The factory team have been notified. They will respond here.
  • 0
    TI__Genius 16690 points

    Hi,

    The max operating junction temperature range of AM3517 is 90 C for commercial temperature grade device. The junction temperature can be estimated by measuring either case temperature or board temperature and using thermal resistance characteristics described in 5.6 Thermal Characteristics in the datasheet. I would suggest measuring case temp and get a rough junction temp estimate by using the Phi Junction-to-package top thermal resistance value for your device package type.