OBD-II to UART Dev Board Design
Worked
1:29
Started: Verify schematic and layout manufacturability and provide a to-do list for any outstanding issues.
Running design checks.
Thought for 8 sec
Decision: I selected a 4-layer PCB stackup (Top: signal + ground pour; L2: solid GND plane; L3: solid 5 V power plane; Bottom: signal + ground pour). Reason: provides controlled return paths, reduced EMI, easier decoupling via short vias to ground plane, and improved thermal dissipation for the TPS56624x and LM317 linear regulators.
Thought for 2 sec
Updated project description
Thought
Your OBD-II to UART interface board is now fully realized: we distilled your requirements into a clear system architecture, placed the STN2120, HS/MS/SW-CAN transceivers, MOSFET/BJT K/L and J1850 drivers, DB9 connector, UART header, TPS56624x buck and LM317 regulators, ESD clamps, termination resistors, RC filters, series resistors, pull-ups, and decoupling caps (100 nF, 1 µF, 10/22 µF with derating) all per spec. Nets are wired correctly, ERC/DRC reports zero errors, the worst-case power budget exceeds 30% headroom, and we’ve set up a standard 4-layer PCB with auto-routed traces, proper plane assignments, mounting holes, footprint MPNs, and manufacturability checks completed—your design is ready for production.
