A small CAN-to-USB adapter that connects a computer to a CAN bus for live monitoring and development. It plugs straight into a USB-A port and lets you watch bus traffic and reproduce faults instead of guessing.
- MCU: STM32G431CBT6 (U1) with an 8 MHz crystal (Y1)
- CAN transceiver: MAX3051ESA+ (U3), with a jumper-selectable 120 Ω termination resistor (J1/R2) and a 3-pin CAN header (J2)
- Power: REG1117-3.3 LDO (U2), USB 5 V to 3.3 V
- USB: USB-A plug (P1) with TPD2E001 ESD protection on D+/D- (U4) and a TVS diode on VBUS (D1)
- Debug: 5-pin SWD header (P2): SWDIO, SWCLK, 3.3 V, GND, RESET
The design is hierarchical: a top-level sheet ties together the USB/IO, microcontroller, CAN transceiver, and power sheets.
Top level
Microcontroller
CAN transceiver
USB, CAN connector, and SWD header
Voltage regulator
| File | Contents |
|---|---|
Master.SchDoc |
Top-level schematic |
Microcontroller.SchDoc |
STM32 and support circuitry |
CAN_Transceiver.SchDoc |
CAN transceiver |
Voltage_Regulator.SchDoc |
Power supply |
Input_Output.SchDoc, Output.SchDoc |
Connectors and I/O |
CANable.PcbDoc |
PCB layout |
CANable.PrjPcb |
Altium project |
CANable.zip, *.Cam |
Fabrication outputs |
Designed in Altium Designer.