nRF51822 current consumption after power-up is often 1000 x higher

RE: nRF51822 current consumption after power-up is often 1000 x higher

Jerod — Tue, 14 Feb 2017 21:29:16 GMT

Resurrecting this thread as we have run into this issue after "programming" the chip and no longer have access to the chip or power supply.

In short, further reading on this: devzone.nordicsemi.com/.../

Suggests that there is a software method (using --pinreset) to get this device out of this state --

This allows us to get out of this mode without depleting the internal battery entirely, hoping the recharge+reboot doesn't initiate this debug state in the future.

Hope this helps someone else ..

RE: nRF51822 current consumption after power-up is often 1000 x higher

FormerMember — Wed, 12 Oct 2016 08:49:23 GMT

Yes, that sounds like a good idea!

RE: nRF51822 current consumption after power-up is often 1000 x higher

Jarmo — Wed, 12 Oct 2016 08:35:15 GMT

What a pitty... Maybe we'll try capacitor on SWDCLK and hope it removes the problem.

RE: nRF51822 current consumption after power-up is often 1000 x higher

FormerMember — Wed, 12 Oct 2016 08:17:47 GMT

It is very unfortunate, but there isn't any flag that can be read for detecting debug mode..

RE: nRF51822 current consumption after power-up is often 1000 x higher

Jarmo — Tue, 11 Oct 2016 08:18:54 GMT

Okay, but is it true that there is no any flag that I could read out and detect if the debug mode is on or not? Measuring current consumption needs more external circuitry...

RE: nRF51822 current consumption after power-up is often 1000 x higher

FormerMember — Mon, 10 Oct 2016 13:46:06 GMT

A typical symptom of debug mode is that the nRF51 consume ~1 mA more than what it normally should do. The thread I linked to explains why the chip can enter debug mode "unexpectedly". Typically, a reset should make the chip enter normal mode.

RE: nRF51822 current consumption after power-up is often 1000 x higher

Jarmo — Mon, 10 Oct 2016 13:04:26 GMT

Is there any way to detect by software that the chip is running in debug mode, and then simply exit that mode using some software trick?

RE: nRF51822 current consumption after power-up is often 1000 x higher

FormerMember — Mon, 10 Oct 2016 07:05:08 GMT

The problem you are seeing is most likely that the chip unfortunately enters debug mode. This thread explains what to do to avoid this problem.