nrf51822 high current consumption

[Matthias]

Hello, i know its an often discussed topic but i already read lots of threads about it and didnt find the answer.

I have a simple program that enables the softdevice s110 and then goes into a loop with sd_app_evt_wait(); thats all the system does. With the development board pc10001 it works well, but on my board the controller needs about 2 mA. If i shut it down in system_off() it works on both boards. i dont have any external oszillators and initialized the sd with RC.

I also always disconnect the debug cable and power off/on the board.

Can anybody give me a hint where the error could be?

[Håkon Alseth]

You mention that you have no external oscillators, does this include the external 16M crystal? You have also changed the 32 kHz source to the synthesized- or 32k RC source?

[Matthias]

Hello, hfclk and lfclk are both RC. Thats correct.

[Håkon Alseth]

The radio will not work without a 16M external crystal. The softdevice init is hanging while trying to start the external crystal.

[Matthias]

Thank you so much! It´s now the 4th day i´m trying on that problem. Adding the external crystal solved the problem! I now found out that it is written in the documentation as well...so that was obviously a little stupid of me! Matthias