Hi Experts!
My customer is having an issue with the device at cold.
"We are seeing odd behavior at cold (below -35C) at startup on all of the boards that use this part.
If fault conditions are present – such as a logic input designated as a fault or an overcurrent fault – the part will blip its enables for all power rails low within a second or two of turning the board on even if those faults are disabled. The board then latches off due to the detected under voltage fault that removing enables induces.
We ran into this issue since our overcurrent limits were set to 0A during development and an over temperature alarm from an FPGA was erroneously triggering at cold. After setting the overcurrent limits to reasonable values and deleting the input associated with the over temperature alarm, the board booted normally down to -65C.
To be clear, this problem only happens at cold. The same firmware that has problems at cold works fine from -30C to 110C.
I am wondering if this behavior has been seen before and if TI can look at our firmware images to see if we have anything hiding in there that could be responsible for this."
Best regards,
Jim B
