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BF707 startup at low temperature

Question asked by artur@nelsystems.ru on Oct 31, 2017
Latest reply on Feb 5, 2018 by Jithul_Janardhanan

When applied VINT 1.1V then VIO 1.8V after 0.2 mS, and 3.3V after 170 mS at low temperature (less than -25C, achieved by liquid gas or refrigerator) ADSP-BF707BBCZ-4 cant startup (then it would have to boot from QSPI), nFAULT go to LOW. At temperatures higher than -20C BF707 loaded well. If well loaded processor is frozen to a low temperature, then it works properly.
CrossCore with ICE-1000 indicated that DSP was broken in Boot ROM (040026da).
What is the reason for this? BF707BBCZ-4 temperature grade is -40C.

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