Irregulation of current peaks while toggling a single GPIO while measuring on PPK2 kit

RE: Irregulation of current peaks while toggling a single GPIO while measuring on PPK2 kit

Simonr — Tue, 14 Jun 2022 08:47:21 GMT

Hi Dharmesh

By "cross verified the peak current with DSO" do you also see this increasing current over 35 minutes, or is this only on the PPK2 side? If so, this isn't related to the PPK2, but must be on your application side.

The only calibration feature on the PPK2 AFAIK is to erase the firmware and reprogram it I'm afraid. This can be done with the nRF Command Line Tools and call nrfjprog --eraseall before opening the Power Profiler app again and click Yes when the dialogue box that lets you program the PPK2 pops up.

Best regards,

Simon

RE: Irregulation of current peaks while toggling a single GPIO while measuring on PPK2 kit

Dharmesh Patel — Mon, 13 Jun 2022 07:05:06 GMT

Hi,

We are using the Ampere Mode.
We have also cross verify this peal current with DSO as well.

Is there any calibration method for the PPK2 kit?

Regards,

Dharmesh Patel

RE: Irregulation of current peaks while toggling a single GPIO while measuring on PPK2 kit

Simonr — Mon, 13 Jun 2022 06:29:14 GMT

Okay, are you measuring in Ampere mode or Source Meter mode (in source meter mode the maximum admissible current is 600mA). Also, as I mentioned I would recommend checking if you see the same (increasing current) behavior on some other current measurement device (oscilloscope or multimeter) as well to confirm that this is specific to the PPK2 or your device, as I'm not aware of an issue like this.

Best regards,

Simon

RE: Irregulation of current peaks while toggling a single GPIO while measuring on PPK2 kit

Dharmesh Patel — Fri, 10 Jun 2022 11:42:36 GMT

Hi Simonr,
Thanks for your reply!

Please note that we are not measuring the continuous current more than the specification limit.

Our Cellular Module BG95 gets the peak current of 1.68A during the power-up event for 25miliseconds. I hope due to this peak current PPK2 will not get damaged.

Also, we are measuring the other device's current using the same PPK2 kit and it shows the right current.

Attaching the snapshot for your reference.

Regards,

Dharmesh Patel.

RE: Irregulation of current peaks while toggling a single GPIO while measuring on PPK2 kit

Simonr — Fri, 10 Jun 2022 11:33:03 GMT

It seems like you're measuring current on something that is a bit too heavy duty for our PPK2. The maximum DUT admissible current according to the specifications is (in Ampere mode) 1A continuously, which this application seems to exceed, so my guess is that the PPK2 has been damaged by supplying it too much current.

If that wasn't the case, I would recommend checking if you see the same (increasing current) behavior on some other current measurement device (oscilloscope or multimeter).

Best regards,

Simon

RE: Irregulation of current peaks while toggling a single GPIO while measuring on PPK2 kit

Dharmesh Patel — Fri, 10 Jun 2022 05:43:52 GMT

Attaching a video for better understanding. devzone.nordicsemi.com/.../Current-Peaks.mp4