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79 lines
2.9 KiB
Markdown
79 lines
2.9 KiB
Markdown
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## Block Diagram
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Eventually, the design constraints listed in the previous section led
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to the following electronic diagram, featuring 3 main blocks:
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- 1x main PCB (0.8 mm thickness) with components on both sides, the
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maximum component height above PCB on both sides is 1.5 mm. Current
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revision for this board is Revision E
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- 1x 1.54” IPS TFT LCD screen with SPI interface and using a
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custom flex cable, containing a built-in screen controller chip
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- 1x 420 mAh 402540 LiPo battery, containing an active protection
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circuitry
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{.lightbox}
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## 3D View
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A 3D rendering of the PCBA done in KiCAD produces the images below:
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{.lightbox}
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{.lightbox}
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## BOM
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An interactive BOM is available in the [next section][1].
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## Schematics and Layout
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All the hardware design and production files required to build the
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[**FunKey S** retro-gaming console][2] electronic PCBA using the
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[KiCAD ECAD tools][3] are available as Open Hardware in the [FunKey S
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Hardware repository][4].
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???+ note "Topological vs. logical schematic symbols"
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The **FunKey S** schematics use symbols and placement that are as
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close as possible to their corresponding physical package and
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layout, instead of defining symbols that are conveniently arranged
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by logical properties. Even if this makes schematics more complex
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at first sight, the benefit of this approach is that the step to
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go from the schematics to the physical layout becomes much easier,
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and so is the debugging of the physical board, which is then very
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close to the schematics too.
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???+ note "Explicit schematic wires"
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Another habit that is used everywhere in the **FunKey S**
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schematics is that all signals (except power supplies and GND) are
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routed using explicit wires, rather than counting on invisible
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connection by net names and relying of the reader to search these
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names all over the place. This forces related components to be
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clustered in compact groups to shorten the wires, and put more
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focus on inter-cluster signals, with a natural inclination to
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unravel wire nests in the schematics before laying out the actual
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board.
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???+ note "Power supply nets"
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There are some "PWR_FLAG" symbols added here and there, which is
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the proper way in KiCAD to declare that a given net has a known
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supply and thus prevent the ERC (Electrical Rule Check) to throw
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an error.
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The schematics will be discussed function by function in the following
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sections.
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[1]: https://htmlpreview.github.io/?https://github.com/FunKey-Project/FunKey-S-Hardware/blob/master/BOM/ibom.html
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[2]: https://www.funkey-project.com/
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[3]: https://kicad.org/
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[4]: https://github.com/FunKey-Project/FunKey-S-Hardware
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--8<--
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includes/glossary.md
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--8<--
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