Measuring current consumption with CR2032 battery as the input

RE: Measuring current consumption with CR2032 battery as the input

Stian Røed Hafskjold — Thu, 05 Nov 2020 13:39:34 GMT

Hi,

1. Yes. Patrick's answer is correct

2. The major differences between a battery and a DC power supply is the internal resistance of the battery and discharge rate. The internal resistance can be simulated by placing a resistor in series with the VDD input, and battery discharge by lowering the voltage. If you just want to measure the average power consumption, a DC power supply is usually good enough.

3. Sorry, no.

RE: Measuring current consumption with CR2032 battery as the input

A.P — Thu, 05 Nov 2020 12:41:51 GMT

I'll mark your answer as a correct one after someone from Nordic answers the other questions I've asked.
It occurred to me they might not see it if I mark your answer as correct.

Thanks again for the information!

RE: Measuring current consumption with CR2032 battery as the input

Patrick — Mon, 02 Nov 2020 12:24:15 GMT

Take a look at this DevZone case.

RE: Measuring current consumption with CR2032 battery as the input

A.P — Mon, 02 Nov 2020 08:06:28 GMT

Hi Patrick!
Thank you for the answer!
I assumed the PPK was drawing the relevant power it needs (as opposed to the one the DUT draws) from the USB connected to it. I'll look at the specifications to see if I can spot anything mentioning this.

If what you're saying is correct, then I assume that would mean that one can not use a CR2032 battery as an input voltage into the PPK..

RE: Measuring current consumption with CR2032 battery as the input

Patrick — Sun, 01 Nov 2020 19:38:47 GMT

I do not have an answer to all of your questions but I have seen an answer from Nordic in the past that states that an external power source feeding the PPK also powers the PPK as well as the DUT. This being the case, a CR2032 is definitely not sufficient to power the PPK for any significant period of time.