Broken PPK?

RE: Broken PPK?

Arepa — Wed, 06 May 2020 01:28:44 GMT

Hi haakonsh I finally replaced the small resistor R4 1.8Ohm, and now the PPK is working as before measuring the current properly

For reference, the correct combination key to access to calibration on nRF Connect - PPK

Alt+Shift+Ctrl+a

Regards,

Arepa

RE: Broken PPK?

haakonsh — Thu, 16 Apr 2020 07:46:56 GMT

devzone.nordicsemi.com/.../nRF6707-Power-Profiler-Kit-_2D00_-Hardware-files-1_5F00_0_5F00_0.zip

RE: Broken PPK?

haakonsh — Thu, 16 Apr 2020 07:25:46 GMT

Those three resistor measurements are way off.

That R4 resistor looks like it's blown, Do you know the correct value for it?

RE: Broken PPK?

Arepa — Wed, 15 Apr 2020 19:53:14 GMT

Hi haakonsh

I followed the steps above resetting the calibration values:

Reflashing the PPK, after that, I measure the load using an "external DUT" the resistors 2.2k (no 1k available for me), 10k and 100k

Here my results

100k at 3600mV - > 22.721uA

10k at 3600mv ->232 uA

2.2k at 3600mV -> 80mA

Also, I modified the Resistor calibration for high from 1.831 to 90 using the 2.2k resistor returning the exact current value using Ohm's Law for voltage and the load resistor, but is it a reliable fix to my PPK?

I am also wondering if Resistor Calibration values are actual values for the resistors High, Mid and Low position (R2, R3, R4)?

I also looked at

https://devzone.nordicsemi.com/f/nordic-q-a/47560/power-profiler-kit-gives-wrong-current-measurments where it is a similar behavior

so the tiny R4 resistor also has a small spot, like it is burned I am going to give a try to replace it and update my response late

RE: Broken PPK?

haakonsh — Wed, 15 Apr 2020 07:46:02 GMT

So I've got a few things that I need you to try:

In the PPK application, press ctrl+alt+a and reset the calibration values.
Erase and reflash the PPK.
If those two methods do not work, use resistor loads of 1k, 10k, 100k, and report what current consumption you measure.

RE: Broken PPK?

Arepa — Tue, 14 Apr 2020 13:36:50 GMT

it's a Rev 1.1.0

2017.17

RE: Broken PPK?

haakonsh — Tue, 14 Apr 2020 08:18:14 GMT

What PPK board revision do you have?