jlink problem

[Miroslav]

Hi, My Jlink lite CortexM work with nrf51822 DK boards. But my PCB with nrf51822_xxAA chip can't download code. I'm using ukeil When I chek in utilities Jlink can't recognize SW IDCODE of device. All is set good. PCB is 100% good. Thank you.

[Miroslav]

Well 12k is placed in datasheet. But from some reason it is not soldered on PCA10001 and working without problem. I first placed serial resistor and got device working on low freq 10kHz. After shortening lines it goes up to 50kHz And by adding 12k on SWDCK it goes to 2MHz :). Maybe I could skip first 2 steps...