Project Overview and Technical Analysis

flux

2:06

Analyzing the PCB layout.

Running design review.

Reviewing the bill of materials.

This project is a vehicle display subsystem (from a Tesla Roadster open-source design) intended to show how to optimize cost and supply-chain risk in a real, fairly complex mixed-signal + power PCB.
Purpose (what it’s trying to do)
  • Provide a compute/control core for a display system using a microcontroller + external parallel memories.
  • Interface out to a display panel/cable harness and supporting vehicle I/O.
  • Generate multiple power rails from an automotive supply and drive peripherals like backlight and audio.
Core building blocks (what’s on the board) 1) Compute + memory subsystem
  • Main MCU: U1
  • Parallel NOR flash (boot/firmware storage): U4
  • External SRAM (frame buffers / scratch): U5, U6, U8, U9
How they interact:
  • The nets indicate a classic parallel memory bus (address lines, data lines, chip-enables, OE/WE, byte-lane controls) between U1 and the memories (e.g., U4, U5, U6, U8, U9).
  • A small logic decoder helps expand chip-selects: U7
2) Display / external connectivity
  • High-pin-count FFC/FPC to panel or subassembly: J3
  • Additional headers/connectors for harness/debug/peripherals:
How they interact:
  • The display-related net portals (LCD signals) imply U1 drives panel timing/data routed to J3.
  • Many test points exist for bring-up and measurement (e.g., TP1, TP12, TP23).
3) Power conversion + protection (automotive-facing)
Switch-mode regulators/drivers present:
  • Main buck regulator: U13
  • Additional buck: U16
  • Dual-rail/boost-sepic style supply generation: U17
  • LED driver (likely backlight-related): U18
Protection / input conditioning:
  • Resettable fuses: F1, F2
  • TVS for surge/ESD: D18
How they interact:
  • Power net portals show multiple rails (e.g., VDD/VCC/+12 variants) distributed to logic and peripherals. The DC/DC parts (U13, U16, U17) generate those rails; protection parts (F1, F2, D18) help survive vehicle transients.
4) Communications (vehicle network)
  • CAN transceiver: U11
  • CAN common-mode choke: L6
How they interact:
  • U1 provides CAN TX/RX to U11; L6 conditions CANH/CANL for EMI robustness before leaving the PCB.
5) Analog + audio + control “extras”
  • Audio power amp: U20
  • Quad op-amp: U19
  • Dual op-amp: U10
  • Digital potentiometers (calibration/trim/user controls): U2, U3
  • Reset supervisor: U14
  • User input button: S1
Implementation notes (design choices, trade-offs, optimizations) Parallel external memory architecture
  • Pros: High bandwidth, deterministic access (useful for display pipelines with big SRAM).
  • Trade-offs: Many address/data/control lines increase routing complexity, layer count pressure, and EMI sensitivity. It also increases connector/pin-count needs.
Automotive power approach
  • Multiple switchers (U13, U16, U17) suggest a “generate what you need” rail strategy, which is typical for mixed loads (digital + backlight + analog).
  • Optimization lever (cost/supply): Consolidating rails or selecting higher-integration PMICs can reduce BOM line items, but may worsen EMI/thermal or constrain sequencing.
Supply-chain red flags already visible in the BOM
  • Several key ICs show lifecycle risk (example: U4 is flagged obsolete at some distributors; U19 appears obsolete).
  • This aligns with the project’s “cost optimization” theme: you’d typically replace these with available, pin-compatible (or near) alternatives and re-verify.
Layout + manufacturability snapshot (from PCB)
  • Board size rule: 84.7 mm x 67.5 mm (from the Layout rules).
  • Current DRC/implementation state indicates it’s not “production ready” yet:
    • Airwires (unrouted nets): present (many)
    • Overlapping copper shorts: present
    • Floating copper: present
    • ERC flags include:
      • No-connect violation on U4 (NC pin connected)
      • Missing power driven on U1 (VDDA_PLL not driven)
These issues are consistent with an educational/example project or an in-progress PCB rather than a finished layout.
Potential challenges + performance considerations
  • Signal integrity / timing: Parallel memory + display timing signals can be sensitive to skew, ringing, and crosstalk; routing topology and return paths matter a lot.
  • EMI/EMC: Automotive supply + switching regulators + long connectors can create conducted/radiated EMI issues; CAN also has strict EMC expectations (helped by L6).
  • Thermals: Switchers (U13, U16, U17) and audio (U20) are typical hotspots.
  • Reliability / transients: Proper protection (already present via D18, F1, F2) must be validated against the real vehicle environment.
Real-world applications
  • Retrofit or OEM-like display controller modules
  • Instrument clusters / infotainment subassemblies
  • Any embedded HMI needing deterministic memory bandwidth and rugged power input
Areas for improvement / scalability / future enhancements
  1. Close out correctness first
  • Fix the ERC items (NC pin connection on U4, undriven rail on U1).
  • Resolve DRC shorts/airwires/floating copper before evaluating performance.
  1. Supply-chain hardening
  • Prioritize replacements for parts with “Obsolete/EOL/NRND” signals such as U4 and U19.
  • Replace “template no MPN” passives with sourced equivalents to eliminate the MPN review errors.
  1. Architecture scaling options
  • If you need more graphics throughput or want fewer high-speed parallel nets: migrate toward a more integrated SoC/display pipeline (trade-off: software complexity, different power/EMI profile).
  • If you need modularity: keep the compute+memory local and push panel-specific analog/backlight onto a separate mezzanine connected via J3.
If you want, tell me whether your focus is (A) making this manufacturable as-is or (B) doing a cost/supply-chain redesign, and I’ll outline the highest-impact next steps in that direction.
Show top layout issues
Explain memory subsystem
Check power rail sources
Find obsolete parts
Sign up to send

To get started, talk to Flux or create a New Document.

Documents

    Documents are markdown text files which describe project goals, capture details, or even simulation outputs.

    Assets

    Thumbnail VDS.jpg

    Thumbnail VDS.jpg

    Thumbnail VDSThumbnail

    Tesla Vehicle Display System | AI Cost Optimization Tutorial [Example]

    Tesla Vehicle Display System | AI Cost Optimization Tutorial [Example] thumbnail
    Learn how to optimize your project for cost with this Vehicle Display System project that was open sourced from the Tesla Roadster. Optimizing your BOM for cost can take forever to research component alternatives and understand the supply chain. Learn how to optimize for cost in seconds with Flux Copilot.

    Properties

    Properties describe core aspects of the project.

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $19.03–$29.52

    Digi-Key

    $37.80–$40.36

    LCSC

    $33.64–$33.82

    Mouser

    $40.82–$41.15

    TME

    $14.32

    Verical

    $9.12–$34.04

    Controls