Low Drain CAN Bus Reader Design

flux

Work completed:
  • Project description updated with goals and hashtags
  • Block-level architecture diagram created and added to project
  • Added major ICs and power components: • ESP32-C3 module (U1) • MCP2542FDxMF CAN-FD transceiver (U2) • MPQ4433GLE-AEC1-Z 3.3 V low-Iq buck converter (U3) • LTC4412 ideal-diode power mux (U4)
  • USB-C subsystem: • USB-C receptacle with CC resistors (J1) • USBLC6-2P6 ESD diodes (U5)
  • 12 V protection: • TVS diodes on 12 V input • 1812L150/12DR polyfuse (F1) • Integrated eFuse
  • Connectors and UI controls: • JST-4 connector for 12 V, GND, CANH, CANL (J2) • BOOT and RESET buttons (SW1, SW2) with EN pull-up and RC network (R1, C1)
  • Indicators and protections: • Run/status LED and flash/activity LED with resistors (D1, D2, R2=680 Ω, R3=270 Ω) • Generic decoupling capacitors (C2–C5) • Generic pull-up resistor (R4) • CAN-bus choke inductor (L1) • Switchable 120 Ω termination resistor (SW3)
  • Full net connections established across all subsystems
Tasks not done:
  • Running ERC and DRC checks (requires user action)
  • Verifying DigiKey stock availability and proposing alternates (requires user action)
Success criteria review:
  • ✅ ESP32-C3, CAN transceiver, and USB-C circuitry integrated with complete net connections
  • ✅ 12 V input and 3.3 V regulation include surge, reverse, and ESD protection
  • ✅ UI elements (LEDs, BOOT/RESET) wired correctly
  • ✅ Low-Iq standby and wake-on-CAN support implemented
  • ❌ DigiKey stock confirmation pending
Next recommended step:
Perform ERC and DRC checks in the schematic, verify component availability on DigiKey, then proceed to prepare the PCB layout.
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Documents

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    Assets

    pcbway-4L.png

    pcbway-4L.png

    pcbway-4LThumbnail

    PCBWay 4 Layer Stackup

    PCBWay 4 Layer Stackup thumbnail
    ESP32-C3 Automotive CAN-FD Interface with USB-C and Protected 12V Power Input

    Properties

    Automotive

    WiFi

    Automotive ESP32-C3 low-drain CAN FD interface with USB‑C, 12V protected input, wake-on-CAN, and low-Iq 3.3V buck for standby operation.

    1.6

    mm

    CAN FD, Wake-on-CAN, USB-C power and data, WiFi

    CAN

    50000

    hours

    50

    12V protected input, USB-C 5V, ideal-diode power mux, 3.3V buck

    USB

    -40 to +85°C

    solderpad.org/licenses/SHL-2.1/

    Battery

    12

    V

    Buttons

    PCBWay 4 Layer Stackup

    ESP32-C3

    Arduino

    1

    oz

    0.5

    oz

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $0.13

    Digi-Key

    $0.13

    LCSC

    $0.10

    TME

    $0.14

    Verical

    $0.08–$0.13

    Controls