Hi,
I have a custom PCB with an nRF54L15 with custom PCB trace NFC antenna working currently with ncs v2.9.1. The NFC is used for commissioning and reading out parameters during field service. The NFC antenna works just fine for all boards initially, but after being deployed for a while in the field, it seems that the NFC functionality stops working for some boards (no pattern identified yet). The PCBs are potted (silicone) in an enclosure and there is no visible damage to the PCBs when investigating. The issue is not (always) resolved by power reset (taking out the batteries and putting them in again), nor recovering the board through a programmer, which seems to point to a hardware issue. I tried replacing the matching caps, but that didn't work. I'm in the process of getting a VNA to check the antenna, but I wanted to ask if there is anything that could have gotten damaged on the nRF54L15 SOC? There are no strong NFC fields in the neighborhood of my installations as far as I know. The NFC is always on (nfc_t4t_emulation_start() is called at startup, nfc_t4t_emulation_stop() is never called). I do see that the device can still wake up from NFC, so it seems that a field is still received, but I don't see any nfc_t4t_events being logged. Any pointers to what could be the issue are welcome!
Best,
Wout