nrf51822 power consumption

RE: nrf51822 power consumption

Daniel — Sun, 12 Apr 2015 06:36:11 GMT

I have been experimenting with different ways to wake up the NRF51822.

Has anyone used a wakeup receiver with the 51822 before? Apparently it allows you to remotely wake the device.

Other than than, Nordic officially published the following power consumption data:

0.4 μA @ 3 V OFF mode 0.5 μA @ 3 V in OFF mode + 1 region RAM retention 2.3 μA @ 3 V ON mode, all blocks IDLE

It is a surprise to read your System On Sleep Mode consumes 300μA given the above publishings.

RE: nrf51822 power consumption

Ole Morten — Fri, 17 Jan 2014 10:17:45 GMT

You could also take a look at these projects on our GitHub: https://github.com/NordicSemiconductor/nrf51-powerdown-examples

RE: nrf51822 power consumption

Dan — Fri, 17 Jan 2014 05:04:02 GMT

Hi Ole I have done it,Thank you very much.

best regards Dan

RE: nrf51822 power consumption

Dan — Fri, 17 Jan 2014 04:23:21 GMT

Yes, I just need pin wake-up in system off mode and system on sleep mode,in system off mode ,there is no problem,in system on sleep mode(after run __WFI()),if I don't use GPIOTE IN channel,how to wake-up with GPIO pin? Is there any example?

RE: nrf51822 power consumption

Ole Morten — Thu, 16 Jan 2014 11:02:34 GMT

If you use the IN/OUT channels of GPIOTE, the 16 MHz clock will stay running, and this will cause >1 mA extra current consumption. Same goes for UART, once you start RX or TX the 16 MHz clock will stay running.

If you just need pin wake-up you should therefore make sure to instead use the PORT event and the SENSE field in NRF_GPIO->PIN_CNF[] registers. As for UART, you should use hardware flow control to enable it only when needed.

You can take a look at this question for reference, and the table in section 8.3 of the PS.