5V power measurement PCA10040

[Hugo]

I need to measure full power consumption of nrf52, on PCA10040 from... a 5V source (because including some other 5V devices).
I measure it from 5V pin and not usb plug.
I cut SB29, to remove atmel processor leak. But I stil get around 4.5mA leakage (all led off), I don't know where from, and it seems huge for a regulator. (around 5mA +peaks while advertising)
Shoud I cut some other lines to only keep the regulator and nrf52 powered?

[Simonr]

Hi Hugo

Indeed, these graphs look very noisy indeed. I assume the Y-axis' value is in Amperes, and if so it definitely looks very high. What application code are you running on the DK, is it one of our example projects or your own custom code? Here on my side, I have the following graph for the DK advertising regularly (ble_app_blinky).

Best regards,

Simon

[Hugo]

on SDK15.3
as I said, the run app was the bt uart example (original, no modification).
I just tryed the blinky example, and the led is not blinky.
powering from:
5V pin: about 10mA quite constant (lazy to check the graph), including a led ON, not blinking. So I don't really trust your graph. Anyway, the led consumes about 5mA, we are still 5mA too high
VDD pin with 3.3V: 13mA... not sure it's the way to do it.
I don't know how to test the blinky app (and I don't really care), but i can see the device advert on my phone, so it seems to be well flashed.

Please, forget your board you want to sell me, and just tell we the way to measure power consumtion of only the nrf52chip+regulator through 5V line, with a SMU input.

[Hugo]

just to let you know I tested with a second pca10040, and with ADALM1000 board, and I have quite persistant data.
So it problem doesn't seems to be on my hardware. I'm missing something, but I don't know what, and I can't measure power used on pca10040 consistantly.
I also use for some IoT prototypes you board with some external arduino compliant battery shield, and I think I waste a lot of energy that I could save if I knew what waste so much energy on the board.

[Hugo]

can you explain me how you get so low current, while this example uses full time led?