Extended Temperature Screening

Chamber Testing

• To guarantee -40 to +85°C (E48), boards must be pre-screened in ADL Embedded Solutions thermal chambers with extended temperature memory.
• Extended temperature memory is recommended for anything outside 0-70°C . ADL Embedded Solutions experience has been that standard-rated memory is usually OK in range of -25°C to 70°C.
• For any extended temperature applications, care should be taken to maintain maximum junction temperature below 100C. Utilities such as ADL-SST can be used to monitor CPU temperature.

Standard 4hr Temperature Profile

• Minimum Temperature during this cycle is -40C. See graph below.
• Maximum Temperature during this cycle is +85C.
• Unit must pass cold restart test at -40C.
• Units must survive a Max temperature hold at +85C.
• The Full Temperature cycle takes approximately 3 ½ to 4 hours.
• Cold Restart: All CPU boards must execute a cold-reboot at -40C during the standard test cycle.
  • At the coldest point in the test routine, the boards are shutdown, and then sit in the chamber for 30 minutes while temperature inside the chamber holds at -40C. This "cold-soak" delay allows all remaining heat to dissipate, and ensures the entire board has cooled down to -40C.
  • After the 30min cold soak the units are powered up. Units that do not boot-up normally, are screened out as Cold Restart Fails.
• Max Temperature Hold: All CPU boards must run for an extended period of time at maximum temperature during this test. During the hottest part of the test, Ambient temperature is held at +85C for 30 minutes while the CPU boards are still running the test loop. This max-temperature hold ensures the CPU boards can operate for a sustained period of time at maximum ambient temperature.