Idling with low-speed timer

[cth]

Hi,

I am trying to build a low power device using the nRF51422 SoC without a Soft Device. I need a timer to occasionally wake up the chip and as I read the product specification it should be possible to achieve a current consumption of 250uA when using only the 1MHz low-speed timer and a 16MHz crystal oscillator (PS 3.1, table 22, page 40). However, with an example from SDK 8.0 as starting point and the nRF51 development kit, I have not been able to get the power lower than approximately 550uA. I use the current measurement guideline from the DK user guide. What can be done to lower the current further?

A sub question: When programming using IAR the current consumption is considerable higher until the development kit is restarted. Is it possible to avoid this?

Best Regards, cth

[Susheel Nuguru]

good that you found that post from Carles, i don't know how I missed to post that in my reply. GPIOTE is known to be mischievous with current consumption, glad that it all worked out.