Hello,
I’m working with an nRF5340-based device (NORA-B106-00B) and nRF Connect SDK 2.0.2. At low temperatures (around -20°C), some boards fail to advertise BLE (the advertisements are no longer detected). When the temperature drops further (around -25°C), more boards exhibit the same issue. However, returning the boards to room temperature allows BLE advertisements to resume.
I haven’t created any custom firmware for the network core (no separate net core build). I’m also using the SC32S-7PF20PPM crystal at 32.768 kHz.
Q1: Could the network core be experiencing a watchdog reset (LDOG) or CPU lockup (LLOCKUP) at low temperatures, leading to a situation where only the network core is reset?
Q2: Are there any known issues with the nRF5340 BLE controller at low temperatures, or recommended troubleshooting steps for this scenario?
Any insights or suggestions would be greatly appreciated. Thank you!
Best regards,