USB Breakout Board Design

flux

0:00

Work Completed
  • All schematic changes per steps 1–5 implemented (project description, architecture diagram, key ICs, passives, VBUS/tamper/ESD nets, ERC/DRC updates).
  • Footprints verified and BOM enriched with MPNs and manufacturer details.
  • Reviewed DRC issues and verified manufacturability items that could be completed in schematic and BOM.
Remaining Unaddressed Tasks
  • Define and assign a standard 4-layer PCB stackup (inner VBUS & GND planes).
  • Draw the board outline with slotted capture pads for USB-A pins, shield-stake holes, and mounting ears.
  • Classify nets (USB diff pairs, power, ground) and set differential impedance rules (90 Ω) and power-net trace widths.
  • Place all components on the PCB outline, including chassis-bonding features.
  • Route nets (differential pairs, power, signals) per layout rules using Auto-Layout.
  • Run manufacturability DRC checks for missing footprints, invalid layers, and floating copper in the PCB layout environment.
Success Criteria Review
  • Mechanical mating & chassis mounting: Pending (outline & placement not defined).
  • VBUS path & sensing: ✅ schematic completed.
  • One-shot tamper mechanism: ✅ schematic integration complete.
  • USB 2.0 SI (diff-pair impedance & ESD): Partial (series resistors & TVS added; impedance rules not yet applied).
  • Documentation & design-rule compliance: ✅ BOM and ERC/DRC checks in schematic done; PCB-level DRC pending.
Recommended Next Step Proceed to the “Prepare PCB Layout” phase of the Flux workflow: set up the 4-layer stackup, draw the board outline with capture pads and mounting holes, and classify nets with impedance rules. Once that’s in place, you can place components and begin routing.
157 days
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

    No assets added.

    Relieved Red Power Laces

    Relieved Red Power Laces thumbnail
    Piggyback USB2.0 Type-A Mezzanine Interposer with Reverse-Current Protection, Tamper-Resistant D+/D− One-Shot Shunt, Supercap Backup, and SI-Compliant Chassis-Mounted Shielding

    Properties

    Power Conversion

    30

    px

    Power

    7.62mm

    ONSHORE_USB-A1VSB6

    USB 2.0

    2.5

    mm

    4 + shield stakes

    USB

    Telecommunications

    Mechanical

    USB

    [(-6.57mm, 0mm), (6.57mm, 0mm)]

    On Shore USB-A1VSB6

    Adjustable slotted pad pattern to accommodate typical 4-pin right-angle through-hole USB-A receptacles with ~2.5 mm pin pitch and shield stakes at ±6.57 mm

    USB 2.0 Type-A tamper-detect interposer with integrated reverse-current protection, polyfuse, VBUS TVS, supercapacitor-based energy store, and one-shot–latched D+/D- shunt for tamper response. Implemented on a standard 4-layer stackup with inner planes for VBUS and GND/return to support USB 2.x signal integrity in a compact interposer form factor.

    12

    mm

    mermaid graph TD J2["J2: USB-A Right-Angle Receptacle"] Mezz["Mezzanine PCB (Piggyback Interposer)"] CHASSIS["Chassis / Rear I/O Shield"] %% Mechanical mating J2 -->|Pin Contacts| Mezz Mezz -->|Shield Stakes| CHASSIS subgraph Power Path MP5016["U1: MP5016 Load Switch"] FUSE["F1: Polyfuse"] TVS["VBUS TVS Diode"] J2_VBUS["J2 VBUS Pad"] GND[(GND Plane)] Mezz -->|VBUS_IN| MP5016 MP5016 -->|VBUS_PROT| FUSE FUSE -->|VBUS_OUT| TVS TVS -->|Clamp to GND| GND TVS -->|VBUS_OUT| J2_VBUS end subgraph Tamper Circuit U2["U2: LTC6993 One-Shot Timer"] U3["U3: LTC3625 Supercap Charger"] U4["U4: D+/D- Shunt Switch"] Dshort["D+/D- Short Node"] J2_VBUS -->|VBUS_SENSE| U2 U3 -->|*PFO (Power-Good)| U2 U2 -->|LATCH_ENABLE| U4 U4 -->|Short D+/D-| Dshort end subgraph SI & ESD Protection Rser["R1/R2: 22Ω Series Resistors"] ESD["U5: USBLC6 ESD Array"] TP2["D+ Test Pad"], TP3["D- Test Pad"] J2 -->|D+/D-| Rser Rser -->|D+_INT / D-_INT| ESD ESD -->|Protected D+/D-| J2 ESD -->|Clamp| GND Rser --> TP2 & TP3 end %% Shield bonding SHIELD["Connector Shield"] J2 -->|SHIELD| SHIELD SHIELD -->|Bond| CHASSIS

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $20.61–$63.02

    Digi-Key

    $36.52–$148.72

    LCSC

    $30.65–$31.16

    Mouser

    $49.16–$52.44

    TME

    $2.35

    Verical

    $14.48–$45.82

    Controls