Can't program nRF5340 when powered by vbus

[Dawid Placha]

Hi there,

We are developing on the NRF5340, and have a question regarding programing.
You cannot program a core, while Nordic is only powered by Vbus.
When I give Vbus power to Nordic, the programmer is able to see him but It is impossible flash , but not why?

Could you please point us to some more information?

Kind regards,

Dawid

[Jared]

Hi,

You cannot program a core, while Nordic is only powered by Vbus.
When I give Vbus power to Nordic, the programmer is able to see him but It is impossible flash , but not why?

In Normal mode (VDDH & VDD not tied) you need to supply the VDD to program the board. VBUS only supplies the USB interface. At least you have to connect the VDDH interface to VBUS(high voltage mode), if you're only supplying via VBUS.

USBREG — USB regulator control

REGULATORS — Regulator control

regards

Jared