Can't reach desired μA values on nRF52833 on power saving modes

RE: Can't reach desired μA values on nRF52833 on power saving modes

Learner — Mon, 11 Dec 2023 14:25:00 GMT

OK, will do.

RE: Can't reach desired μA values on nRF52833 on power saving modes

Kazi Afroza Sultana — Mon, 11 Dec 2023 13:22:45 GMT

Hello Mohamed,

Can you please open a new ticket describing the issues elaborately so I will reply there.

Thanks.

BR
Kazi

RE: Can't reach desired μA values on nRF52833 on power saving modes

Learner — Wed, 06 Dec 2023 11:56:48 GMT

Good Morning,

I am trying to reduce the power consumption of our device (nrF52833 SoC) to the bear minimum by sending into shutdown mode. I am wondering whether you can help me out.

[quote userid="108933" url="~/f/nordic-q-a/94717/can-t-reach-desired-a-values-on-nrf52833-on-power-saving-modes/400368"]$nrfjprog --memrd 0x50000700 --n 0x80 && nrfjprog --memrd 0x50000A00 --n 0x40[/quote]

1- When I first tried to use the nrfjprog command to read the status of my GPIO pins I found my application stops running. I did, however, get a dump of the GPIOs statuses as shown below,

C:\WINDOWS\system32>nrfjprog --memrd 0x50000700 --n 0x80 && nrfjprog --memrd 0x50000A00 --n 0x40
0x50000700: 00000002 00000002 0000060C 00000001 |................|
0x50000710: 00000002 00000003 00000002 00000002 |................|
0x50000720: 00000002 00000003 00000002 00000003 |................|
0x50000730: 00000002 00000002 00000002 00000003 |................|
0x50000740: 00000002 00000000 00000002 00000002 |................|
0x50000750: 00000003 00000003 00000000 00000001 |................|
0x50000760: 00000002 00000002 00000002 00000002 |................|
0x50000770: 0000060C 0000000C 00000000 00000002 |................|
0x50000A00: 00000002 00000002 00000002 00000002 |................|
0x50000A10: 00000002 00000002 00000002 00000002 |................|
0x50000A20: 00000002 00000000 00000000 00000000 |................|
0x50000A30: 00000000 00000000 00000000 00000000 |................|

I am not sure whether I can trust the information given above since the nrfjprog command interfered with the normal operation of the device.

2- On subsequent tries I get this error message,

C:\WINDOWS\system32>nrfjprog --memrd 0x50000700 --n 0x80 && nrfjprog --memrd 0x50000A00 --n 0x28
ERROR: The operation attempted is unavailable due to readback protection in
ERROR: your device. Please use --recover to unlock the device.
NOTE: For additional output, try running again with logging enabled (--log).
NOTE: Any generated log error messages will be displayed.

Any comments?

Note, this is my hardware setup,

Windows laptop connected through USB to nRF52833-DK board in turn connected to the target board built around nRF52833 SoC.

Kind regards

Mohamed.

RE: Can't reach desired μA values on nRF52833 on power saving modes

Kazi Afroza Sultana — Wed, 14 Dec 2022 12:21:58 GMT

You are welcome. Great to hear that problem is solved.

RE: Can't reach desired μA values on nRF52833 on power saving modes

IoTMAN — Wed, 14 Dec 2022 10:42:26 GMT

Ooops, noob mistake. You're right. One of the pins were HIGH and powering a resistor. Now everything seems as it should be, thank you.

RE: Can't reach desired μA values on nRF52833 on power saving modes

Kazi Afroza Sultana — Tue, 13 Dec 2022 12:14:51 GMT

Hello,

Can you share your schematic design of hardware?

You can read out the GPIO registers to check if any of the GPIOs are configured as output. If there are any GPIOs pin are on as output, it may power other peripherals of the board.

This is the command of checking this:

$nrfjprog --memrd 0x50000700 --n 0x80 && nrfjprog --memrd 0x50000A00 --n 0x40

Here is previous case you can look at for reference (https://devzone.nordicsemi.com/f/nordic-q-a/94117/nrf52840-dongle-and-blinky-example-using-gpio-0-31-draws-8ma/398294).

Thanks.

Best Regards,

Kazi Afroza Sultana

RE: Can't reach desired μA values on nRF52833 on power saving modes

IoTMAN — Mon, 12 Dec 2022 13:02:22 GMT

Hello, thank you for your reply.

Yes I do.

RE: Can't reach desired μA values on nRF52833 on power saving modes

Kazi Afroza Sultana — Mon, 12 Dec 2022 12:25:29 GMT

Hello,

Do you have external 32KHz crystal on the custom board?

Thanks.

Best Regards,

Kazi Afroza Sultana