Power management- usuing external LFCLK

[Gili Elias]

Hi, I'm trying to reduce as much as I can the BLE current consumption in advertise mode and unfortunately I can't go under 1.6 mA. Can you please tell me what are the exact steps I should take to do that? What I want to do is to advertise with the defined interval on SYSTEM-ON base current with 16 kB RAM enabled. My current, as I understand it, should be around 2.6 uA, but I can't reach it.

I use an external Crystal LFCLK. How should I define the ble_stack_init? how should I define the timer_init and start_timer functions to use only in the LFCLK and not in HFCLK? For low current between advertises I use sd_app_evt_wait() function. Still, because of my stcak (probably) I can't reach the low current of 2.6 uA.

What's makes the current so high? What are the recommended settings to make the component work in minimum current?

Thanks.

[Gili Elias]

Hi Ole,

we are measuring without a debugger and next think we will look at next week are IOs and any fast peripherals which may still be active. we have been able to get to below 2uA in OFF mode before, so I guess that now since we are enabling the softdevice we need to disable peripherals properly before we go to OFF state.

regards, Gili

[Ole Morten]

When you go to system off, everything will be turned off automatically, so no manual turning off is needed. However, when you go to system on sleep, everything that's already enabled will stay enabled, so in this mode you should absolutely disable everything you don't need.

However, if you found my original reply useful, I'd be happy if you could accept it, to clear up this question. :-) If you have any further problems next week, I suggest you post them separately.