Current draw in System On Mode (Idle) with timer interrupt?

[djokovic]

As indicated in the PS, System On Mode idle draws only 2.6 uA.

Does this mean that if I install and active a timer interrupt, where the interrupt routine places the system into this sleep state at the end each time, that I get 2.6 uA in between interrupts?

[Håkon Alseth]

If you use any of the high-speed timers, such as TIMER0/1/2, these will require the 16M clocktree running, which will add 470 uA to your sleep current, as stated in chapter 8 in the PS (8.3 and 8.1)

Using the RTC (via the app_timer module for instance) instead will give you a power consumption close to the number that you've stated, as this only requires the 32.768 kHz clock source.