What are the official recommendations for caps and inductors for nRF53?

[ScottBBBB]

When I look at datasheet and reference designs for the nRF5340, I see a variety of approaches to DC/DC converter and bypass components.  Is it a 10 uH inductor, or is it 10 uH + 15 nH, for instance?  Capacitor values on DCCx and DECx pins vary as well.  We are very space-constrained, so this matters a lot to us.  What's the official minimum set?

Thanks,

Scott

[Kenneth]

Looking at the reference schematic:
https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/ref_circuitry.html#concept_refcircuit_config_1

I would say you can remove the circuitry connected to DCC and DCCD if you won't want to use DCDC, however that will increase the power consumption. Please see here for "optional" components:

https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/supply/doc/power_supply.html#normal_supply_mode 

https://infocenter.nordicsemi.com/topic/ps_nrf5340/regulators.html#normal 

If you don't want to support USB, you can likely also free up some components also. 

However you will need all decoupling capacitors, crystal components, and ANT circuitry. The Bill of Materials specify the electrical parameters for each component.

[ScottBBBB]

We will be using the DC/DC, but not USB.  I've attached two images of reference schematics.  One is from the link you posted above (i.e. the datasheet) and the other is from the reference design for the QKAA pkg. As you can see the inductors and capacitors are different.  The reference design for the CLAA package matches pretty well the QKAA schematic from the datasheet, so the QKAA reference design is the one that's different.  Which is correct?

[Kenneth]

I think you are looking at old reference layout files, please download latest:
https://www.nordicsemi.com/Products/Low-power-short-range-wireless/nRF5340/Downloads

Kenneth

[ScottBBBB]

Yes, it appears that the QKAA reference has been updated from 0.9 to 1.0, and the schematic is consistent now with the CLAA.

Thanks,

Scott