The nRF52832 spec. document specifies that the current consumed in System OFF / No RAM retention / Wake on LPCOMP mode is 1.9uA. However, if I measure the current using the Nordic PPK, it is only ~0.4uA. I assume my software / SoC works correctly because I can see that the chip goes in to the system off mode and wakes up by LPCOMP interrupts.
Could anyone confirm if 1.9uA shown in the spec is a correct value? Do you have any idea why the actual measured current is much lower than the spec.?
I have a feeling that the 1.9uA in the PS is wrong. I'm pretty sure that 0.4uA is correct. I will try and measure it here.
Stian, thanks for the quick response. Look forward to hearing the result from you.
Were you able to measure this current? In the 832 PS, it says 1.9 uA.
In the 840 PS it is only 0.86 uA and in the 833 PS it is only 0.9 uA.
I did some measurements on 840, 833 and 832. In the case of 840 and 833 the PS seems to be correct, except that I measured lower 'system OFF wake on reset' current on 833. I got 0.3 uA, not 0.6 uA.
1.9 uA for 832 'system OFF wake on LPCOMP' is too much. I measured 0.7 uA. I will report this internally.
I just want to add that the numbers in the PS are typical values. i.e. the average over a large set of samples. There will be device to device variations, so if you measure only one sample you will most likely not get the same result as in the PS.