can't connect jlink to nRF52840

RE: can't connect jlink to nRF52840

awneil — Wed, 04 Sep 2019 10:11:37 GMT

Thanks for feeding back.

Please verify the answer:

sean — Wed, 04 Sep 2019 09:57:53 GMT

We found out it was a SMT problem, thank you!

awneil — Wed, 04 Sep 2019 08:53:31 GMT

[quote userid="79779" url="~/f/nordic-q-a/51732/can-t-connect-jlink-to-nrf52840"]We can't connect jlink to nRF52840[/quote]

As Øyvind says, how are you trying to connect it?

And what "J-Link", exactly, are you using?

Øyvind — Wed, 04 Sep 2019 07:49:44 GMT

Hello,

[quote user=""]We can't connect jlink to nRF52840[/quote]

How are you connecting jlink? Have you verified that all pins are connected?

[quote user=""]then we check the voltage of DEC pins, Is this correct?[/quote]

No, you should check the VDD pin to see if you have the correct voltage.

[quote user=""]And what's the function of DEC pins(DEC1\DEC2\DEC5)? The datasheet description is not very detailed.[/quote]

The DEC pins are just decoupling pins as described in the pin assignments. You can read more about the decoupling on the nRF52840 in this whitepaper: nWP030 - Power supply decoupling capacitor selection

Kind regards,
Øyvind