nRF52 Timer power consumption

RE: nRF52 Timer power consumption

FormerMember — Fri, 08 Jun 2018 07:19:13 GMT

Do you have logging enabled?

Which other peripherals are running?

RE: nRF52 Timer power consumption

Haim Gaddasi — Tue, 05 Jun 2018 11:26:23 GMT

I have the same exact problem, what did you mean 'initializing the APP timer.'? In my code the 'ret_code_t app_timer_init(void)' does not execute and the current is 398 uA.

RE: nRF52 Timer power consumption

FormerMember — Tue, 08 May 2018 08:37:25 GMT

Is logging over UART enabled? If so, try to disable it?

RE: nRF52 Timer power consumption

markopa — Fri, 04 May 2018 14:25:39 GMT

Well, that's a surprise. I lost nearly 1 week of debugging why our app when idling consumes around 400uA and finally nailed it down to initializing the APP timer.

Is there a way we can get into sub 10uA area and keeping parts of RAM and the RTC functional ?

RE: nRF52 Timer power consumption

FormerMember — Wed, 04 Apr 2018 13:58:01 GMT

The current consumption in the "TIMER" chapter specifies the current consumption used by the TIMER module itself. Since the TIMER peripheral uses the HFCLK, you would need to add the current consumption of the selected HFCLK source to get the total amount of current used.

RE: nRF52 Timer power consumption

Alexx — Mon, 02 Apr 2018 13:58:03 GMT

Yes, but why does the manual say: "Run current with 1 MHz clock input (PCLK1M) 8 μA MAX", p241 nRF52832_PS_v1.4.pdf :)

RE: nRF52 Timer power consumption

AmbystomaLabs — Mon, 02 Apr 2018 13:39:11 GMT

Any time you are running HF timers you are running an HF clock. If you actually care about accuracy then you would need to run HF_EXT as HFINT can be off by several percent. Either way running the HF clocks is a very power hungry service and nearly as bad and running the whole processor.

If you need low power, you should try to adapt your needs to the RTC timers. Since they clock nearly 1/500 as much, they use very little power.

RE: nRF52 Timer power consumption

Alexx — Mon, 02 Apr 2018 11:16:40 GMT

How much consumption nRF52832 is expected from the Timer1 clk 31250Hz and the processor in the idle, clocking from HFINT?

RE: nRF52 Timer power consumption

FormerMember — Tue, 04 Oct 2016 13:39:03 GMT

Unfortunately, there is an error in the product specification, and the current consumption you measure is normal for the nRF52832..

The current consumption should be a little lower if you can use the internal 16 MHz RC oscillator instead of the external HFCLK.