Low Drain CAN Bus Reader Design
Thought
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.
Waiting for input
