nRF54 Debug Interface During Abrupt Power‑Off

RE: nRF54 Debug Interface During Abrupt Power‑Off

joey — Fri, 21 Aug 2026 12:47:31 GMT

On the development board, the UART pins are directly connected to a module equipped with the TXB0108. The TXB0108 module is powered by a separate 3.3 V supply, while the development board itself draws power from its on‑board USB port. During normal operation, if the USB cable of the dev‑board is unplugged abruptly while the TXB0108 module remains powered, the system crashes with high probability.

RE: nRF54 Debug Interface During Abrupt Power‑Off

Simonr — Fri, 21 Aug 2026 11:14:33 GMT

How is the power supply removed here on the nRF54L DK exactly? I think maybe the device could be trigging on the tamper controller, but I need more information on what you're doing exactly. You can check the TAMPC register if it's been triggered.

Can you potentially tell me how I can reproduce this on an nRF54L15 DK on my end so I can read out some registers to see what happens here?

Best regards,

Simon