Settings for maximum current draw from PPK

RE: Settings for maximum current draw from PPK

Stian Røed Hafskjold — Tue, 02 Apr 2019 13:12:22 GMT

In the PPK specification it is stated 70mA. This is probably on the safe side.

RE: Settings for maximum current draw from PPK

Sridhar Jonnavittula — Tue, 02 Apr 2019 13:00:13 GMT

OK. We will do that also for sure and with the above assumption we were not doing that.

What is the maximum inrush current the PPK supports for the external board?

RE: Settings for maximum current draw from PPK

Stian Røed Hafskjold — Tue, 02 Apr 2019 12:40:01 GMT

You should connect the JLink to the PPK and start the PPK software. The software does the resistor calibration and switching between the measuring resistors.

RE: Settings for maximum current draw from PPK

Sridhar Jonnavittula — Tue, 02 Apr 2019 12:01:37 GMT

Hi,

We followed the same setup in above link.

In regulated power supply we can see current drawn at 60mA and

voltage dropped to 2.7v when tapped the P16 pins of PPK in multimeter.

This means enough current(more than 60mA) is not supplied from PPK to external board.

In this case our external board is not booting up yet because it is needed more than what PPK is supplying.

Currently our focus is to bootup the external board. After bootup successfully we can start profiling. Hence we are not connecting any JLINK to PPK software.

So do we need to calibrate/ change any settings of PPK like resistor calibrations, voltage regulator etc?

Thanks

RE: Settings for maximum current draw from PPK

Stian Røed Hafskjold — Tue, 02 Apr 2019 11:15:09 GMT

I think the best way would be using the PPK as a standalone device.

Do not stack the PPK on top of the nRF52840 DK, but use a 10 pin SWD cable from the debug out on the nRF52840 DK and to the debug in port on the PPK.

Use the same setup as in figure 2 in this link: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.tools/dita/tools/power_profiler_kit/PPK_user_guide_PPK_on_customHW_standalone.html?cp=5_6_5_5

The DK can be used as the SEGGER JLink shown in the drawing.