I expect the device to work right down to -40°C. Can you kindly let me know how we deduce that the device has shutdown. Would it also be possible to let me know the status of XRES and VDDD pins.
Also, it would be helpful for us to troubleshoot, if a simple firmware like toggling GPIO is used in the environmental chamber.
It would also be nice if I can get the schematics.
The way I deduced that the device has shutdown is by monitoring the IO it controls. This IO includes: an I2C bus connected to a host PC via a TotalPhase Aardvark and 7 different pins connected to enable lines of other devices on the board.
I continuously monitored the VDDD pin and it was consistently at 1.799V over all temperatures. I did not monitor the XRES line, but I can try that. What am I looking for when monitoring XRES?
Below is the schematic of the device.
I am using a code that also continuously measures the die temperature using the internal temperature sensor which is transmitted over the I2C bus to the host PC.