RE: Reference design of the nRF52805?

Andreas — Fri, 21 Aug 2020 08:07:12 GMT

Hi,

As mentioned any component that fulfills the specified requirements can be used. You can find some part numbers in the nRF52-DK BOM: https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF52-DK/Download#infotabs

Best regards,

Andreas

RE: Reference design of the nRF52805?

efi malz — Thu, 20 Aug 2020 11:36:56 GMT

thanks Noah

Arad still like a reference. Specifically for the inductors and cristals that Nordic used. in the nRF52DK board

Thanks

Efi

RE: Reference design of the nRF52805?

Noah — Thu, 20 Aug 2020 08:43:34 GMT

There is not one single part number for each component in this BOM. There may be several manufacturers that make products which will fit the specifications described in the reference circuitry. For example if I go to mouser.com and search for ceramic capacitors, then apply the appropriate filters (SMT, 0201 size, 2% tolerance, 12pF capacitance) I can see there are 28 options available. If you need 5 of these capacitors, vs. 100, 1000, or 10,000+, you may want a different part number. Or, if you want/don't want RoHS you may choose a different part number. Here is an example search, showing the 28 available options for C1, C2, C6 and C10: https://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/MLCCs-Multilayer-Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-bkrdv?P=1z0x7ryZ1z0z7ymZ1z0wpn9Z1yzmoue. You can do the same for the other parts in the BOM.

Also, just because the BOM specifies an 0201 part size (capacitors C1, C2, C6, and C10 for example), you can use 0402 or larger part sizes if your application allows for this. The reference design is called a "reference" design exactly for this reason, it is not an absolute law and would actually incorrect to list a specific part number and say "this specific part # is what developers should use", when in fact there may be many other alternative part numbers that would also work just fine.

Best of luck with your project, component sourcing is an important pillar all in itself when creating PCBs :)