Nrf52840 dongle power consumption testing

[gio]

Hi,

How do you recommend to analyze nrf52840 dongle power consumption?

What I have is:

• Nrf52840 dongle
• Nrf52DK
• Nrf6707 profiler kit

How can these be used together to test power consumption using the dongle 5V USB connector? 

Thanks a lot!

[Turbo J]

Use a sharp knife to carefully cut an USB extension cable. You only want to cut the +5V VBUS line - leave the data and GND intact.

Now you can use any multimeter to measure the +5V supply current into the dongle.

The DK and profiler kit only supports up to 3.6V, which is not enough for USB VBUS.

[gio]

Sorry, using a multimeter is not useful in my case. I need precise current consumption analysis (in the order of few mAh,10 max) of ble events (high frequency) over long period of time.

I would like to find a way of reusing the great nrf6707 if this is possible

[gio]

Ok, I found the answer. The Dongle works even when powered with 3V from Nrf6707.

On the nrf6707, it is sufficient to set DTU switch to "external", and the Power switch to "DK".

Then the DTU connector must be connected to the Dongle: positive to Dongle VBUS pin, negative to Dongle VGND pin with an alligator clip.

It was easier than I thought! Thanks Nordic for your great products!