nRFStudio can not connect to J-Link

[aileen]

I want to bring up my own new board, but the nRFStudio can not connect to the J-Link, please check the picture. I connect 4 lines from board to J-Link, including VCC, GND, SWDIO, SWCLK, and I have already checked the signal of oscillator (16MHz), everything is fine, I do not know what I should do now, please help. P.S.If I click the Recover button, the ERROR dialog showed.

[MartinBL]

Hi

• Do you have a power supply on your board? The debugger is not capable of supplying power.
• What nRF51 version and build number do you use? Some IC revisions requires an external pull down resistor on the SWDCLK line. See the Product anomaly document to find out which IC revisions are affected by this.
• Are you absolutely sure that you have connected everything correctly? If you want us to have a look at your design feel free to contact us at our support portal at nordicsemi.com. (Or you can post your design here if you are comfortable with that)
• Your J-Link driver seems to be somewhat outdated. Try to install the latest drivers: www.segger.com/jlink-software.html. You should also download the latest version of nRFgo Studio if you haven't already.

[aileen]

Thanks Martin, I have post the sch. The target have powered on using a cell battery and I checked the VCC already. The version is nRF51822 QFAAG2 and there is a 12k pull down resistor on the SWDCLK line. My J-Link can connect to a demo board normally, so maybe the driver is fine, I will update the driver of course. Thanks again.