KiCAD footprints for OAK-SoM Pro

PeterMilani

Are there any footprints for the OAK Som Pro for developing a carrier board. It would be nice if there were existing kicad ones, failing that a pdf. I understand the datasheet has a mechanical dimensions and arrangement of the DF40HC-100 and M3 holes, but doesn't show the pin numbering. I am unsure which is the number 1 and number 101 pins, so I was hoping someone may have already made a footprint and symbol to aid integration

cheers

Peter

jakaskerl

Hi @PeterMilani
SoM designs are not accessible on depthai-hardware. I'd suggest looking at carriers like FFC-4P which will give you an idea of how to design your own. Generally the pins (1 and 100) are marked on the PCB.

Thanks,
Jaka

PeterMilani

Hi @jakaskerl, I wasn't after the Som designs as I understand they're closed but looking for a footprint that just treats the som as a component. There are some example footprints for like the RPI CM4(https://www.digikey.com.au/en/maker/projects/creating-a-raspberry-pi-compute-module-4-cm4-carrier-board-in-kicad/7812da347e5e409aa28d59ea2aaea490), and other som boards but its difficult custom interface board without understanding where pin 1 and pin 101 are on the board.

I can see there's a dot next to the 100pin recepticals, and I might be able to work out which dot corresponds to which pin. Confidence will be low without a proper footprint drawing as the layout is all mirrored.

I thought it might have already been done by someone before that why I asked.

PeterMilani

@jakaskerl any luck with a footprint for the Som Pro?

Is connector A on the right and connector B on the left?

erik

@PeterMilani A is on the side (right), B is in the middle (left on the img).

PeterMilani

@erik thanks, what is the numbering internal to the connectors? Do you set them incrementally increasing down one side then the other, or does the pin number alternate?

PeterMilani

@erik Just looking at the fab outputs for the ffc 4P, The answer is alternating each side down the connector from the camera DP circuits, matching the numbering in the datasheet:

PeterMilani

I moved this post to a separate question. As the above has been answered.

PeterMilani

@erik @jakaskerl just an update, my integration was not successful. I got the footprint wrong for the SOM, basically ass about and the only way I could tell that is by examining the number of differential pairs leading from my board and comparing it to the DD2090.

I'll be fixing it but it would have been really great if there was a "luxonis correct" KiCAD footprint for this part if the plan is for users to easily integrate it into their own designs, it would have saved me some significant number of work. At the moment I wouldn't recommend people try, as the documentation is too sparse/non-existent. e.g. there is no footprint in the datasheet.

Before I send this off for production, I would really appreciate an "idiots guide"footprint for the the SoM-Pro. Even a PDF will suffice.

cheers

Peter

EDIT: It seems that the actual error is in the hole layout. As the A an B headers are not marked in the datasheet mechanical layout, the hole locations given in the datasheet really have no good reference. I think I could reverse the SOM to test the rest of my circuit just the holes wont line up.

EDIT2: Actually I don't think my pin numbering is correct… so really need that "idiot's guide" footprint.

jakaskerl

PeterMilani
Only thing we can provide is this -- luxonis/depthai-hardwaretree/master/SoMs.
We likely won't be releasing a KiCAD footprint.

Thanks,
Jaka

PeterMilani

jakaskerl a pdf footprint would have been awesome.

Even after working out how to open it up in Altium Viewer, which the support AI helped with. I still needed to use the dimensions in the datasheet to complete the design.

A dimensioned and labeled footprint in the datasheet is what is needed.