Fathom-X WiFi Bridge Design
Thought for 7 sec
To get it manufactured now, use the exported files like this:
1. Order the bare PCB
Use the Gerber ZIP:
Upload that ZIP to a PCB manufacturer such as JLCPCB, PCBWay, Seeed Fusion, or Elecrow.
Recommended PCB settings:
- Layers: 4-layer
- Board size: 30 mm × 120 mm
- Thickness: 1.6 mm unless you have enclosure constraints
- Copper: 1 oz
- Surface finish: ENIG preferred, HASL acceptable
- Solder mask: any color
- Impedance control: recommended if your fab supports it, because Ethernet/RMII pairs are present
For JLCPCB-style assembly, use:
- https://cdn2.flux.ai/flux-comment-files/files/commentFileId-f5e1f1b289a4b20ff577347b84fb8e61965cb905739f47696d35d8f2311e75ce.csv?GoogleAccessId=autopilot-sa-d60c62b%40graviton-mvp.iam.gserviceaccount.com&Expires=4934714201&Signature=oMhKP35BabvVd%2BYoDYn2JdDzeHE9oCR%2F1f0eC4YUCrqnap%2Br8vs9g7Mxn5OXVFznCYOKtsH1T4N3CJQPqoqGwDzIwXjo4CFDENovFUAwB7EY7xDHQqeNr5zcDDZXHXoQQGGk%2FZ9VgvnLPOehEPnvqYp%2BGKYnG2n%2B1cthBOxEhfDCKKND%2FkDYGFVpTLBAERsXkrtRu8a6gqyRn9JC8tlRAij9V6yLLPJ8SOzXcfFyIVHMrbUiY5aJxn2RMkGoiKu8FnWuZY5G8wiyZCdirP6PseZypT3MYvej16E%2FEV6ZWe9WUn7cSDf%2BlV5zSIDwdRa6Vm7l4MC4gfY0iCbQbWqUow%3D%3D
- https://cdn2.flux.ai/flux-comment-files/files/commentFileId-4ee7b40907a2be6b9ba948f4cd7e981c7ad52931d233b9aa39fd17a2dbd90b82.csv?GoogleAccessId=autopilot-sa-d60c62b%40graviton-mvp.iam.gserviceaccount.com&Expires=4934714242&Signature=eBRvdMijMOv9FIaw6xErttFJ7mpkYy1QoJ9YzWy0E%2F5SRRJVV2X2j6xhuC%2Flyzd6rQebVjKnvwGTNM85O76ZcyS4vt%2FFXBAZvOGfcP%2BvcFQrltGrvHeBanzQcqMhLB%2Fw0ALdbCC2Kwabmml2E2zmQuiVAT1qdI4DRK%2BPqabvTqFXmZi38LuSHWoMvxnYcEE9saRx4%2B1o6g%2BL4bPZ3ahsXi%2FcSC10i0t6sukuqgT2u4en1v%2FWo9QcSpbIX6eTaiBQQTIL2qL%2FiwLsyNA4hUGQkwc62kbj%2Fg%2B2vspBSO1ZcRoHNmk62Rnvh6TMkBLB7Zb7XMD60Dj2zLxLeLRVdVls%2Bw%3D%3D
If your manufacturer is not JLCPCB, use the Flux/standard BOM and OpenPNP pick-and-place files instead.
3. Before paying, check these previews
In the fab ordering page:
- Open the Gerber viewer.
- Confirm the board outline is 30 mm × 120 mm.
- Confirm the USB-C connector, tether terminal, and power terminal are at accessible edges.
- Confirm there are no obvious missing copper layers.
- For assembly, check pick-and-place rotations for:
- ESP32-WROOM-32E
- LAN8720A
- CH340C
- LX200V20 module/socket
- UT11403S transformer
- USB-C connector
- polarized/special parts if any
Some parts may not be available through automated JLCPCB assembly, especially:
- LX200V20
- UT11403S
- Possibly the 48V DC/DC converter module
- Some high-voltage capacitors
Best practical approach:
- Let the assembler place common SMD parts: resistors, capacitors, ESP32, LAN8720A, CH340C, USB-C, etc.
- Hand-place or separately source specialty modules/parts: LX200V20, UT11403S, large DC/DC modules if unavailable.
Follow the bring-up plan before connecting the full 48V tether system:
- First power with current limit.
- Verify 12V, 5V, 3.3V, and LX200V20 3.3V rails.
- Program the ESP32 over USB-C.
- Verify Ethernet PHY detection.
- Then test tether/HomePlug link.
Do not connect the full tether power source first without current limiting.
is this a two layer or 4 layer board?
Thought for 11 sec
It is a 4-layer board.
Current layout setup:
- Board size: 30 mm × 120 mm
- Copper layers: 4
- Stackup: Standard 4 Layer custom
- Intended layer use:
- Top: components + signals
- Inner layer: ground reference plane
- Inner layer: power / routing
- Bottom: signals / routing
A 4-layer stackup is the right choice here because the board has Ethernet/RMII signals, USB, multiple power rails, and a narrow 30 mm form factor.
Export 4-layer files
Check stackup details
Fix package mismatches
Review impedance routing
Assembly guidance
Refine this doc
Ask about this doc
Project Specification
Design Summary
Status: Draft / Review / Approved
Manufacturing target: Prototype / EVT / DVT / PVT / Production
Software / firmware: repository link
Scope
Purpose
In scope
Out of scope
System context
Requirements
Functional
Electrical
Mechanical / environmental
Key constraints
Dependencies and risks
Dependencies
Key risks
Validation
Success criteria
Planned checks
Release-facing notes
Expected deliverables
Special release notes
Change notes / open questions
Changes in this revision
Open questions
Design Summary
Scope
System context
Requirements
Functional
Electrical
Mechanical / environmental
Key constraints
Dependencies and risks
Validation
Release-facing notes
Change notes / open questions
