Device Stuck in Sleep Mode (System Off) - nRF52840

RE: Device Stuck in Sleep Mode (System Off) - nRF52840

PjGlasso — Thu, 22 Aug 2024 13:31:47 GMT

Hi there,

So could it be a week pullup resistor situation? can you can a pullup resistor and see if it improves, the boot process. From reading I see there is a possible WEAK resistor that isn't keeping it happy for boot and appears as a Strapping pin instead?

My .02

HTH

GL :-) PJ

RE: Device Stuck in Sleep Mode (System Off) - nRF52840

MEHUL RANA — Wed, 21 Aug 2024 10:03:17 GMT

Hi,
I am unable to share the entire schematic, but I can provide the button connection diagram.

[quote userid="122791" url="~/f/nordic-q-a/113921/device-stuck-in-sleep-mode-system-off---nrf52840/499127"]how is it powered.?[/quote]

It is lithium battery powered device.

[quote userid="122791" url="~/f/nordic-q-a/113921/device-stuck-in-sleep-mode-system-off---nrf52840/499127"]Do you have a schematic to post? I would clean it off and put a row of pins on the target board, You try a GND jumper from the SWD interface and the power GND pin? [/quote]

Yes, we already do that.

/Mehul

RE: Device Stuck in Sleep Mode (System Off) - nRF52840

PjGlasso — Tue, 20 Aug 2024 22:16:57 GMT

OK , wow I see it's a WIP.

Do you have a schematic to post? I would clean it off and put a row of pins on the target board, You try a GND jumper from the SWD interface and the power GND pin?

You may have a ground loop or not enough GND pins connected, do you have a big capacitor on the VDD 3.3v

how is it powered.?

GL ;-) PJ

here is my old setup, b4 the DK

RE: Device Stuck in Sleep Mode (System Off) - nRF52840

MEHUL RANA — Tue, 20 Aug 2024 06:06:21 GMT

Sure, here i attached a picture of my setup.

/Mehul

RE: Device Stuck in Sleep Mode (System Off) - nRF52840

PjGlasso — Sat, 17 Aug 2024 02:42:39 GMT

HI there,

Can you show how it is connected, or a picture of the setup.

Could there be incorrect pull UP/Down resistor pin assignment, The debugger is showing you something.

almost like a strapping pin action? and the debugger makes it NOT. or high Z?

GL :-) PJ