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.
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