vasyl / CM4 Template

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Diseño de PCB para Raspberry Pi CM4

flux

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Work completed
  • Project description updated to detail PCIe cellular slot integration
  • System architecture property set with CM4, PCIe slot, power, USB, SIM, and antenna subsystems
  • J3 placed with mounting holes and keep-out zone
  • Ground portal symbol added
  • U1 ESD array added for SIM/UIM
  • U2 switched 3.3 V rail controller with enable/reset
  • C1 and C2 decoupling capacitors placed
  • D1 and D2 TVS diodes added at regulator output and connector power pins
Tasks remaining
  • Select and place AC-coupling Capacitor and Common-mode Choke for PCIe/USB lanes
  • Select and add Nano-SIM Holder and u.FL Connector
  • Connect all nets:
    • PCIe differential pairs, REFCLK, PERST# via AC-coupling & chokes
    • USB2.0 D+/D– from hub to socket
    • SIM/UIM through ESD array to nano-SIM holder
    • 3.3 V rail and enable/reset to socket and regulator
  • Review schematic for completeness and electrical requirements
  • Verify passive/active ratings and footprints
  • Configure PCB stackup, copper layers, and ground fill
  • Define mechanical mounting holes and clearance
  • Perform DRC and length-match checks
Success criteria
  • The PCIe slot socket is placed but nets aren’t yet routed; supporting I/O, power, SIM, and antenna connectors are pending. Signal-integrity, EMI/ESD compliance, and board-size fit remain to be validated.
Next step Pick and add the AC-coupling capacitors and common-mode chokes for the PCIe and USB lanes.
195 days
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Documents

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

    Assets

    tesdf.png

    tesdf.png

    tesdfThumbnail
    stp

    CM4-step.stp

    CM4-step3D Model

    CM4 Template

    CM4 Template thumbnail
    Raspberry Pi Compute Module 4 Cellular Modem Carrier Board with PCIe and M.2/mini PCIe Support

    Properties

    flowchart LR CM4["Compute Module 4"] PCIe["PCIe Slot (M.2 Key B / mini PCIe)"] Power["Power Subsystem"] USB["USB 2.0 Subsystem"] SIM["SIM Interface & ESD Protection"] Antenna["Antenna Connectors"] CM4 -->|PCIe lanes, REFCLK, PERST#| PCIe CM4 -->|USB D+/D−| USB Power -->|3.3V rail, enable/reset| PCIe Power -->|3.3V rail| USB Power -->|3.3V rail| SIM SIM -->|UIM pins| Antenna

    creativecommons.org/licenses/by/4.0/

    Pricing & Availability

    Distributor

    Qty 1

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    $2.33–$4.92

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    $2.53–$3.03

    LCSC

    $2.53–$2.81

    Mouser

    $5.42

    TME

    $3.37

    Verical

    $3.20–$4.24

    Controls

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