Can't break 1 mA power consumption on 51822

RE: Can't break 1 mA power consumption on 51822

dgutierrez — Wed, 30 Mar 2016 15:34:51 GMT

Thanks for your help Mango.

RE: Can't break 1 mA power consumption on 51822

MANGO — Tue, 29 Mar 2016 23:55:30 GMT

Hmm, then I have to apologize that I cannot assist your problem.

It's out of my knowledge T.T

Looks like you've read about the pull down resistor for SWCLK.

The person who wrote that thread was Stefan Birnir Sverrisson.

Send a message to Stefan if you are in a hurry.

In the meantime, how about reading this thread - troubleshooting?

Sorry that I cannot help. Wish you good luck.

-Regards, Mango

RE: Can't break 1 mA power consumption on 51822

dgutierrez — Tue, 29 Mar 2016 15:21:59 GMT

Hi, still don't see the drop in current consumption. I have the SWCLK pin pulled low with a 470 ohm resistor. Above was also explicitly disabling all of the peripherals and it didn't change anything.

Using a custom board, but have verified already that the other ICs on the board aren't pulling more than 30 uA.

Used this example as well: https://github.com/NordicSemiconductor/nrf51-powerdown-examples/blob/master/system-on-wakeup-on-gpio/main.c

RE: Can't break 1 mA power consumption on 51822

MANGO — Tue, 29 Mar 2016 08:32:55 GMT

Hi, just in case, are you using a custom board or one of the DK / EKs made by Nordic?

I had a similar question like this.

Referring the answer from that,

When you flash the nRF51, it should be in debug mode and consume ~1mA additional current. 
When you power-reset, you should see a ~1mA drop.
If you do not see this drop, then you either are still in debug mode,
or your application is having some peripheral enabled that 
keeps the 16MHz clock source enabled.

Unfortunately, there is no direct indication of still being in debug mode, 
other than the current consumption is excessive.
Some customers had problems on custom boards because of disturbance on SWCLK,
which triggers debug mode,

So can you check SWCLK pin of your board?