nRF52840 sleep mode time

[Alexey_B]

I'm developing battery powered Zigbee End Device on SDK 4.2.0. I need to be able to receive commands from Zigbee Coordinator so I'm using SYSTEM ON sleep mode. 

Right now I have "good enough" sleep current consumption, but I'm trying to improve it. Right now I have sleep current about 140uA, minimal is 74uA and peaks 2.5mA

So the only way to lower avarage current consumption, that I see, is to increase time between peaks.

My questions is:

1. What does this peak delay(25 ms) depend on?

2. Can I change this time? I have zb_osif_sleep(100).

[Elfving]

Hello again,

I assume the peak is when it sends the keepalive to the parent. You can change the interval with which it sends this, just make sure that it wont be long enough for the parent to believe it has disappeared.

You can read more about this here.

Regards,

Elfving

[Alexey_B]

Hello Elfving,

Are you sure that this peaks interval(25 milliseconds) is keepalive packet? 

I was sure that this peaks are related to keepalive 

This peaks are 5 seconds delay and I can change it with zb_set_keepalive_timeout()

[Elfving]

Ah right, then I guess it isn't keep alive. Doesn't seem to be any packet sending either.

Could you tell me a bit more about the application? Is this essentially a default Zigbee sample? Is there anything else going on that could be using some power?

Regards,

Elfving