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Nordic PPK2 - Updated Power Profiler
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Venturi962:
According to the Block diagram here: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_ppk2%2FUG%2Fppk%2Fppk_block_diagram.html

Power In is labeled as 'Max 5V'

My guess is that the purpose here is for a lower noise supply than using USB Voltage.
palpurul:

--- Quote from: justanothername on March 03, 2021, 11:47:17 am ---Hello everybody.
Sorry for reactivating this old thread. The hardware is practically open source. Do you think it is feasable to modify it to have a range of a decade lower?
I only need 100mA for the highest current but 10nA resolution in the lowest range.

--- End quote ---

May I ask what's the application for such range?
justanothername:

--- Quote from: palpurul on February 17, 2022, 06:47:55 pm ---May I ask what's the application for such range?

--- End quote ---

Actually, last summer we had two interns in our company do the modification. One did the hardware modification, the other did an extension for the ppk2 software for entering new calibration values. It was shown that it is indeed possible to reach the desired resolution. We need such a high dynamic range for profiling ultra low power applications with sporadic RF uplinks. A multimeter would not allow the uplinks to complete, because of the high burden voltage and the slow autoranging. For everyday use, the Joulescope is the tool of choice.
Actually I got a ticket to write a follow up article and to publish the modified sources for the PPK2. I will try to get it done the next weeks.

Edit: one part of the modification can be found here: https://github.com/ThoMint/PPK2-Mod. As said it is uncomplete and I will consolidate the work done in near future.
palpurul:

--- Quote from: justanothername on February 17, 2022, 09:55:09 pm ---
--- Quote from: palpurul on February 17, 2022, 06:47:55 pm ---May I ask what's the application for such range?

--- End quote ---

Actually, last summer we had two interns in our company do the modification. One did the hardware modification, the other did an extension for the ppk2 software for entering new calibration values. It was shown that it is indeed possible to reach the desired resolution. We need such a high dynamic range for profiling ultra low power applications with sporadic RF uplinks. A multimeter would not allow the uplinks to complete, because of the high burden voltage and the slow autoranging. For everyday use, the Joulescope is the tool of choice.
Actually I got a ticket to write a follow up article and to publish the modified sources for the PPK2. I will try to get it done the next weeks.

Edit: one part of the modification can be found here: https://github.com/ThoMint/PPK2-Mod. As said it is uncomplete and I will consolidate the work done in near future.

--- End quote ---
Thanks for the answer! I actually know about how burden voltage causes the DUT to reset, so that's where the auto-shunt switching comes into play.

I was wondering what type of low-power application goes down to 10nA of sleep current.

Thanks!
justanothername:

--- Quote from: palpurul on February 19, 2022, 06:32:07 am ---
I was wondering what type of low-power application goes down to 10nA of sleep current.

Thanks!

--- End quote ---

Two quick examples:

1) Coin Cell and Ambiq AM1815 RTC + MCU. The AM1815 has an integrated load switch that cuts the power of the subsequent circuit unless a wakeup alarm is reached. Quiescent current: 14nA (with RC Oscillator) or 55nA (with XTAL)!

2) LDO  TPS7A0233PDQNR (Iq: 25nA) + STM32F011 MCU (Iq in Stop: 344nA)

With a resolution of 100nA you are basically blind for these cases.
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