nrf52840 mechanical specification issue

RE: nrf52840 mechanical specification issue

Kaja — Wed, 05 Jun 2019 07:05:11 GMT

Hi Olivier,

that happens to all of us some times!

I'm glad it's working, let us know if we can help you with anything!
I'm happy to review you design, if you want feedback on schematic and/or layout.

Best regards,
Kaja

RE: nrf52840 mechanical specification issue

olivdeso — Tue, 04 Jun 2019 19:02:41 GMT

Hi Kaja

Of course you are right !!!! It was time to take a rest after a long week...

Thought I did not use this data (0.559) this was actually what I had on my own PCB that were beeing manufactured.

Since I received the board and they work fine.

I used a Kicad footprint, with 0.3mm pads, no pad on via, and 0.05 mask opening. So far so good...

Thank you Kaja

best regards

Olivier

RE: nrf52840 mechanical specification issue

Kaja — Fri, 24 May 2019 12:22:21 GMT

Hi Oliver,

e2 should be = 0.559 mm.
You can use the formula for right-angled triangle, to calculate the hypotenuse, or e2 in this case.

e2 = sqrt((e/2)^2 + e^2)) = sqrt(0.25^2 + 0.5^2) = 0.559.

Best regards,
Kaja