How Can I use External Segger J-Link(EDU) with PCA10028?https://devzone.nordicsemi.com/f/nordic-q-a/21278/how-can-i-use-external-segger-j-link-edu-with-pca10028It seems that my j-link chip on PCA10028 is dead. I&#39;m not sure How I can Fix it.. so I&#39;d like to use external Debugger(?? I don&#39;t know how it called) Instead with PCA10028.. (for flash new application) (Actually, I Really Want to fix my segger chipen-USTelligent Community 13Tue, 11 Apr 2017 07:37:01 GMTRE: How Can I use External Segger J-Link(EDU) with PCA10028?https://devzone.nordicsemi.com/thread/83296?ContentTypeID=1Tue, 11 Apr 2017 07:37:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e8f6930f-0e64-4936-83e1-29cf5f473d7eVala<p>Hi Daniel T. Lee, You need only four pins for programming nRF series: SWIO, SWCLK, GND and VTref. And you should power your device for example by USB (it must be on). Connect VTref to the power of nRF which is accessible on several points of the board. This line determines the level of digital signals coming from Jlink.</p><div style="clear:both;"></div>