system off mode questions

RE: system off mode questions

FormerMember — Mon, 20 Jun 2016 06:05:04 GMT

When the nRF52 is in system OFF, the chip will use 0.7 uA, and that may be why you cannot measure it with the multimeter in mA mode. However, if the mulitmeter has uA mode, you will be able to measure it.

RE: system off mode questions

rushin — Fri, 17 Jun 2016 10:50:40 GMT

hey i am using nrf51 dk. in that there is P22 for nrf current measurement. but when i put multi meter on it.it showing me 0 mA. can you tell me what is problem??

RE: system off mode questions

FormerMember — Fri, 17 Jun 2016 09:04:23 GMT

If you measure the current consumption, it will be considerably lower when the chip is in system off mode than when running "normally".

RE: system off mode questions

rushin — Fri, 17 Jun 2016 07:34:28 GMT

now can you tell me how to verify that nrf51 is in system off mode or not??

RE: system off mode questions

rushin — Fri, 17 Jun 2016 07:34:01 GMT

yes i see it

RE: system off mode questions

FormerMember — Fri, 17 Jun 2016 07:30:22 GMT

The reason that you seemingly is not able to wake up the chip, is that it will always enter system off mode after all parameters have been initializes.

If you run the chip in debug mode and set at breakpoint in the beginning of main(), you should see that the chip is being reset when pushing the button.

RE: system off mode questions

rushin — Fri, 17 Jun 2016 06:01:51 GMT

waiting for reply

RE: system off mode questions

rushin — Thu, 16 Jun 2016 14:34:09 GMT

hello i have one question. how to verify that nrf51 is in system off mode or not??

RE: system off mode questions

rushin — Thu, 16 Jun 2016 11:40:09 GMT

have you seen my code in that link?? i am trying to wake it using gpio interrupt. but my nrf51 can't wake up. can you tell me why??

RE: system off mode questions

FormerMember — Thu, 16 Jun 2016 11:33:30 GMT

The reason that the debugger stops at sd_power_system_off() is related to what system OFF mode works. The nRF52832 product specification says the following:

System OFF is the deepest power saving mode the system can enter. In this mode, the system’s core functionality is powered down and all ongoing tasks are terminated.

The device can be put into System OFF mode using the POWER register interface.

When in System OFF mode, the device can be woken up through one of the following signals:

The DETECT signal, optionally generated by the GPIO peripheral
The ANADETECT signal, optionally generated by the LPCOMP module
The SENSE signal, optionally generated by the NFC module to “wake-on-field”
A reset

When the system wakes up from System OFF mode, it gets reset.