nRF51422 Current Consumption

RE: nRF51422 Current Consumption

Dilip — Tue, 12 Dec 2017 08:21:22 GMT

Ok will check that thank you

RE: nRF51422 Current Consumption

endnode — Tue, 12 Dec 2017 08:21:05 GMT

Have you seen blog posts how Nordic analyze power consumption with Power Profiler Kit? Something like that. You can then clearly see what is baseline and what are periodic peaks of activity (and from their values you can assume what is in use). Also once you migrate from example app which runs on bare metal/HAL to app which uses SoftDevice you can do quite a lot during Soft Device initialization. So by seeing this sequence of the code we could understand what can be running.

RE: nRF51422 Current Consumption

endnode — Tue, 12 Dec 2017 08:18:51 GMT

You need to get current draw plots with sub-millisecond resolution to understand what is happening, these averaged values won't help you.

RE: nRF51422 Current Consumption

Dilip — Tue, 12 Dec 2017 08:15:51 GMT

Hi,

We have tried with this (sd_app_evt_wait) function also But we are not able to put it in sleep mode it is taking 700-800uA

RE: nRF51422 Current Consumption

Dilip — Tue, 12 Dec 2017 08:14:24 GMT

Hi,

SDK 11 The softdevice we are using is S130 NO we are not running it in debug mode

We are using segger j link to communicate with the device

RE: nRF51422 Current Consumption

endnode — Tue, 12 Dec 2017 07:59:19 GMT

Note that sd_power_system_off is something completely different then SYSTEM ON SLEEP mode which you normally achieve by running WFE/WFI instructions. This is trying to send SoC to POWER OFF mode which is deeper sleep. However because you most probably don't turn all necessary interfaces down the chip don't get to that state so power consumption which you observe is standard operation curve (SYSTEM ON state if you want). To send nRF5x SoC to SYSTEM ON SLEEP mode through Soft Device API you should use sd_app_evt_wait function call.

RE: nRF51422 Current Consumption

ketil — Tue, 12 Dec 2017 07:55:33 GMT

Hi,

Which SoftDevice are you using? Are you running in debug mode? Which peripherals are you using?

It is difficult to give an exact answer without more information. If you search DevZone there are several questions regarding this problem that have already been answered:

SoftReset on sd_power_system_off();

nRF52 does not enter system off

BLE Advertising doesn't stop after sd_power_system_off()

problem about sd_power_system_off

Please check those cases and see if you can find a solution.

Ketil