how to check time in sleep

RE: how to check time in sleep

hongpal — Thu, 24 May 2018 00:10:14 GMT

Oh I want to know this

thank you

RE: how to check time in sleep

Turbo J — Wed, 23 May 2018 15:17:04 GMT

You need an external time source, as ALL oscillators are stopped in System OFF mode. My advice would be not to go into OFF mode but to keep the RTC running in IDLE mode - this allows you to keep track of time.

Another solution would require external components like an RTC chip.

RE: how to check time in sleep

hongpal — Wed, 23 May 2018 14:15:21 GMT

yes, you're right

RE: how to check time in sleep

Kenneth — Wed, 23 May 2018 14:08:44 GMT

I assume the user can press the button at any time, from 0us to 1year?

RE: how to check time in sleep

hongpal — Wed, 23 May 2018 12:44:33 GMT

Thank answer

I'm looking for the chip time to sleep That is, Real time from the chip is asleep to the user press a button to wakeup the chip

RE: how to check time in sleep

Kenneth — Wed, 23 May 2018 07:07:52 GMT

Hi, your application will setup wakeup sources (for instance GPIO and NFC) before calling sd_power_system_off(). If the user now press a button (GPIO) to wakeup the chip, then the time from sleep (OFF) to CPU execute code (running from main()) is typical 16.5us as shown in the table below. What other number are you looking for?

RE: how to check time in sleep

hongpal — Tue, 22 May 2018 14:44:08 GMT

Thank answer

but your answer is not what i want to know

what I want to know is the total time the system sleeps from system off to system on.

RE: how to check time in sleep

Kenneth — Tue, 22 May 2018 12:05:05 GMT

Hi, these are listed in the Device startup times table in the nRF52832 product specifications:

t_OFF2ON

Time from OFF to CPU execute

16.5

µs