Palm-Sized Linux SBC Design

0:00

Work done

Power entry and protection:
- Barrel jack J1: rated 4 A
- Polyfuse F1: 3 A hold current
- Schottky diode D1
- Ferrite bead L1: 6 A
- Bulk cap C1: 1000 µF 10 V
- TVS D3: dual-channel 5.5 V standoff
3.3 V regulator:
- LDO U1
- Decoupling caps C2–C4: 0.1 µF 16 V
Core module:
- Compute Module 5 U3
External connectors & interfaces:
- 40-pin header J2 + EEPROM J18
- micro-HDMI J3
- USB3 USB1 and USB2 J5
- microSD J8
- PCIe M.2 E-key J9
- GbE MagJack J10
- CSI/DSI FFC J15
- Fan header J11 + flyback
- Debug headers, LED_PWR LED_PWR, LED_ACT LED_ACT
Nets connected for all functional blocks
PCB setup:
- Board size: 90×60 mm
- Stackup: 4 layers (Top/GND/Power/Bottom)
- Power planes: Layer 2=GND, Layer 3=VCC
- Ground fill top & bottom
- Mounting holes added
- Trace widths: 5 V ≥ 80 mil, others assigned
- Footprints verified and assigned

Tasks left

Place and auto-route all components (requires manual placement)
High-speed controlled-impedance and length-matching routing (HDMI, USB3, PCIe, MIPI)

Plan status: completed

Success criteria review

✅ RPi5-Core module integrated with all interfaces & connectors
✅ Power management, protection, and test pads detailed
✅ 4-layer PCB outline, stackup, and footprint assignments done
⏳ Controlled-impedance routing and layout validation remain to meet impedance/length rules

Next step Proceed with manual component placement on the PCB, then perform controlled-impedance routing of high-speed nets. After that, run a DRC and review the board for impedance compliance and manufacturability.

115 days

Planning disabled.

Show Plan

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connect a led to the board

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please explain what GPIO25 does.

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how do you add a component to the schematic

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how do I use Flux?

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can you add a 360 degree camera

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are there any issues in this project?

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explain this project.

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Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
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Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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Generic Resistor
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Generic Capacitor
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Generic Inductor
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Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
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875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
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CTL1206FYW1T
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