RE: How To Fix PPK2 Deep Sleep Measurement Inaccuracy with ESP32-H2 Device?

Håkon Alseth — Tue, 28 May 2024 07:27:43 GMT

Hi,

[quote user=""]I am getting a consistent average of 7.8 uA for my deep sleep measurements. However, page 34 of the ESP32-H2 datasheet states that the current should be at 7 uA, and Espressif's measurements on the Joulescope has an average of ~7.6 uA. I have done multiple trials, and the PPK2 never measures below 7.8 uA. As a result, I would like to ask if this slightly inaccurate measurement on the PPK2 indicates that there still might be a problem with my measurement setup, or if if the PPK2 inaccuracy is due to potential noise?[/quote]

There will be chip-to-chip variances, as well as potential floating pins or other circuitry that draws current on a custom design.

With a difference of 200 nA, this is expected based on the resolution of the PPK2:

https://infocenter.nordicsemi.com/topic/ug_ppk2/UG/ppk/ppk_measure_resolution.html?cp=11_9_7_2_1

If you suspect that the PPK2 is inaccurate in this scenario, I would recommend that you double-check your results by using another source meter / multi-meter.

Kind regards,

Håkon