Cold Wallet Hardware Design

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“In this tutorial, we'll explore the different ways to create and modify board outlines in Flux, allowing you to customize your PCB shape and size to fit your project requirements.
Overview
The board outline defines the physical boundaries of your PCB and is one of the first design decisions you'll make. Flux provides several options for creating board outlines, from simple shapes to complex custom designs.
We'll cover the following topics:
  • Basic shapes: Create circular or rectangular boards with precise dimensions
  • Rounded corners: Add rounded corners to rectangular boards for improved manufacturability
  • Custom shapes: Import external shapes for complex designs
  • Best practices: Guidelines for creating effective board outlines
Basic Shapes
Flux has built-in support for simple shapes (circular and rectangular). For complex shapes, please refer to the section on Advanced (custom) shapes.
Changing the Outline Shape” Source
Additional resources:
Specify outline dimensions
Resize board outline
Adjust board shape

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    Fantastic Four

    Fantastic Four thumbnail
    PCB Component Alignment Update

    Properties

    USB

    Centered at (72.3, -235.3), size: 10.0 mm by 8.0 mm

    Display

    1.0 mm

    two-part enclosure with base and snap-fit lid

    3

    mm

    38

    mm

    Consumer Electronics

    55

    mm

    Hole1, Hole2, Hole3, and Hole4 positions match enclosure standoff locations.

    Buttons

    Battery

    60.0mm

    Hole1: (1027.3, -338.8), Hole2: (1027.3, -398.8), Hole3: (1027.3, -458.8), Hole4: (1027.3, -518.8)

    Inner layers (L2: GND, L3: Power)

    graph LR USB_C[USB-C Power Path] --> TVS[TVS & Fuse Protection] Battery[Li-ion Battery] --> Fuse[Fuse & NTC Protection] USB_C --> Charger[BQ24074 Charger] Battery --> Charger Charger --> SystemRail((System Rail)) SystemRail --> MCU[STM32H753 MCU] SystemRail --> SE050[NXP SE050C2 Secure Element] SystemRail --> Display[1.3" OLED Display] SystemRail --> Buttons[User Buttons] MCU --> SE050 MCU --> Display MCU --> Buttons

    STEP, STL

    Centered at (712.8, 398), size: 30.0 mm by 22.0 mm

    USB

    2.0 mm

    SW1 at (1811.3, -101.5), SW2 at (1811.3, -166.0), recess size: 6.0 mm diameter

    Top, Bottom, Side views with critical dimensions

    Apply on inner layers for GND net

    Standard 4 Layer

    44.0mm

    No ERC or DRC issues were found in the current design.

    Pricing & Availability

    Distributor

    Qty 1

    Controls