In the reference layouts for the nrf5340 there are four variations. I can see the subtle variations in each, but don't know I why would choose 1 vs 2 vs 3 vs 4... Is there a document which describes the merits of each of the four options?
nsscprodmedia.blob.core.windows.net/.../nrf5340-xxaa-reference-layout-1_2.zip
The reasoning for not using a ready-made module:
We are creating a device requiring strict consistency over time (requiring an oscillator with low (<3)ppm?), essentially creating a high quality stopwatch, which maintains accurate time in both active and sleep states. We will have a number of these devices that will initially sync their clocks and it's important that they don't excessively drift, without constant "re-syncing".
Therefore we believe we need to have control over the oscillator hardware. However, I am open to alternative ideas if the idea is incorrect.
We initially anticipated using a module, but the 32Mhz clock is always integrated. We could find modules without 32.768khz clocks already in place.
These devices are all monitoring sensors and each device will report it's own time, but each device's time must in sync with the others.
Client insists that each device have it's own internal clock as opposed to a parent device that gets a flag from the children. Communication between devices is wireless/shockburst
