nRf52840 Dongle not Booting with external power

RE: nRf52840 Dongle not Booting with external power

haakonsh — Tue, 19 Mar 2019 13:18:11 GMT

Does the MCU boot at all?

RE: nRf52840 Dongle not Booting with external power

TasosR — Thu, 14 Mar 2019 08:54:49 GMT

I have allready opened a ticked with adafruit.

By "doesnt work" I mean:

I have made a program that uses BLE and changes some LED colors, the program works when the device is connected to a PC but not when it is connected without the Data+- lines of the USB interface ( a mobile phone cannot see the BLE device)

RE: nRf52840 Dongle not Booting with external power

haakonsh — Thu, 14 Mar 2019 08:14:58 GMT

What exactly do you mean by "doesn't work"? We need more specifics.

You should also open a ticket with adafruit.

RE: nRf52840 Dongle not Booting with external power

TasosR — Thu, 14 Mar 2019 07:57:55 GMT

EDIT: This happens only using another bootloader for this device (https://github.com/adafruit/Adafruit_nRF52_Bootloader) and not with the original bootloader ...

RE: nRf52840 Dongle not Booting with external power

haakonsh — Tue, 12 Mar 2019 20:02:39 GMT

That should work the VBUS pad should be connected to VDDH. I'll try to reproduce your issue when I get back from my business trip early next week.

Do you have a scope of VBUS? I'd like to see the rise time and curve of the voltage supply.