AXIOM Beta Compact Shield Considerations
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This is the summary of a discussion with Bertl on 6.12.2018:

The following interfaces and applications are interesting for potential shields in the future:

  • sync/trigger/timecode IN/OUT
  • audio
  • HDMI/Viewfinder (1080p) Output
  • luminance sensor
  • Time of Flight (ToF 3D) Sensor - needs research

East and West shields are already different in design as the slots provide different lanes with different speeds so putting an east shield into the west slot and vice versa will not work.

There is the general question how we could design the shields in a way that they can be utilized with the ABCP AND ABDK.
ABCP requires connectors in specific places so they fit enclosure.
Some shields like the debug shield will likely only be interesting to ABDK users.

For the compact the general problem is that in the location where the shields are placed currently its very difficult to add any connectors or interfaces to the enclosure, especially on the west shield side.
Bertl had the idea to create a small PCB that goes from the shield header directly to an FPC. We then design a small PCB for the above mentioned applications that can be placed somewhere else in the camera and is attached with a ribbon cable or FPC. This means any shields designed for the ABCP also work with the ABDK but with the ABDK there is no easy way to attach the shields.

sebastian created this task.Dec 7 2018, 4:07 PM
sebastian triaged this task as Normal priority.
sebastian updated the task description. (Show Details)Dec 7 2018, 4:11 PM
sebastian updated the task description. (Show Details)
sebastian updated the task description. (Show Details)Dec 7 2018, 4:18 PM
sebastian added a comment.EditedDec 9 2018, 1:11 PM

I created a concept for exploring enclosure options for shield connectors/interface/sensor placements:

sebastian updated the task description. (Show Details)Dec 9 2018, 7:46 PM
sebastian added a comment.EditedDec 10 2018, 11:27 AM

Some more things discussed yesterday summarized:

  • on the west shield power and ground supplies are split between top and bottom connector so we always need both connectors to go to anything connected to the west shield slot.
  • One option is a flex pbc that has two header connectors (might require stiffener there) on one side and two finger banks on the other side (to be plugged into ZIF connectors on the actual shields).
  • Another option is a rigid-flex PCB that contains the actual shields, the flex pcb going to the header connectors and the header pins - rigid-flex solutions are in general more expensive though.
  • OSHPark is no option for any of these above solutions but could be used for the shields connected via flex pcb.