Schematic for PCBWay 4 Layer Stackup: ESP32-C3 Automotive CAN-FD...

Low Drain CAN Bus Reader Design

flux

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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.

44 days

Needs more info.

Show Plan

U1 TXD - U2 TXD

U1 RXD - U2 RXD

SW1 P2 - SW2 1-2

GND

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper • 37

Des	Net	Des	Net
C1:P1	ENABLE	R2:P1	LED_RUN
C1:P1	ENABLE	C5:P1	None
R1:P1	ENABLE	U2:VSS	GND
C1:P2	GND	R2:P2	LED_RUN
C1:P2	GND	C5:P1	None
C1:P2	GND	C5:P2	None
R1:P2	GND	U2:VIO	None
R3:P1	LED_FLASH	U2:VDD	3V3
R3:P1	LED_FLASH	F1:P2	Net 1
R3:P1	LED_FLASH	U2:VSS	None
R3:P2	LED_FLASH	U2:VSS	GND
R3:P2	LED_FLASH	F1:P2	Net 1
R3:P2	LED_FLASH	U1:IO5	None
R3:P2	LED_FLASH	U2:ecacd709	None
R3:P2	LED_FLASH	U2:ecacd709	None
R2:P2	LED_RUN	C5:P1	None
R2:P2	LED_RUN	C5:P2	None
F1:P2	Net 1	U2:TXD	CAN_TX
F1:P2	Net 1	U2:VSS	GND
F1:P2	Net 1	U2:ecacd709	None
F1:P2	Net 1	U2:ecacd709	None
F1:P2	Net 1	U2:VSS	None
C3:P1	None	J2:2	GND
C3:P2	None	J2:1	12V
R4:P1	None	J2:3	CANH
R4:P2	None	J2:2	GND
U1:IO5	None	U2:CANH	CANH
U1:IO5	None	U2:VSS	GND
U1:IO6	None	U2:CANL	CANL
U1:IO6	None	R1:P2	GND
U1:IO6	None	U2:VSS	GND
U1:IO7	None	R1:P2	GND
U2:ecacd709	None	U2:VSS	GND
U2:ecacd709	None	U2:VSS	GND
U2:ecacd709	None	U2:VSS	GND
U2:ecacd709	None	U2:VSS	GND
R1:P2	GND	U2:VSS	GND

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides

Reports components that have been modified using the "!important" flag.

Airwires • 27

	Designators	Net
	D2:A, D1:A	3V3
	U1:3V3, D1:A	3V3
	U1:3V3, U2:VDD	3V3
	F1:P1, J2:1	12V
	SW1:P1, U1:IO0	BOOT
	U2:CANH, J2:3	CANH
	U2:CANL, J2:4	CANL
	U1:RXD, U2:RXD	CAN_RX
	U1:TXD, U2:TXD	CAN_TX
	C1:P1, SW2:1-1	ENABLE
	U1:EN, C1:P1	ENABLE
	U1:EN, R1:P1	ENABLE
	R1:P2, C1:P2	GND
	SW1:P2, C1:P2	GND
	SW1:P2, SW2:1-2	GND
	U2:VSS, Via-4-5:Via-4-5	GND
	Via-4-1:Via-4-1, U5:GND	GND
	R3:P2, U1:IO3	LED_FLASH
	U1:IO3, D2:K	LED_FLASH
	R2:P2, R2:P1	LED_RUN
	U1:IO2, D1:K	LED_RUN
	U1:IO2, R2:P2	LED_RUN
	F1:P2, J1:Trace d070	Net 1
	J1:VBUS, U4:VIN	Net 1
	U5:VBUS, J1:Trace d070	Net 1
	U5:I/O2, J1:Trace d070	USB_DM
	U5:I/O1, J1:Trace d070	USB_DP

Deprecated Rules

Reports nodes that are using rules that are not supported anymore.

Layers with Multiple Fills • 1

	Layer	Net
	All	GND, GND, GND

Floating Copper

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Manufacturing

Manufacturer Part Number • 10

	Designator	MPN
	C1	None
	C2	None
	C3	None
	C4	None
	C5	None
	L1	None
	R1	None
	R2	None
	R3	None
	R4	None

Parts Available

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Checks that all parts have a part number and are available from distributors.

System Checks

Auto-Layout

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Reports issues with Auto-Layout if Flux cannot route something or must ignore a configuration.

Passive Components

Resistor Power Rating

Beta

Checks that the power traveling across a given resistor is under its rating with 50% headroom.

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Pull Up/Pull Down Presence

Beta

Checks that IC pins that require pull up or pull down resistors have them.

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Capacitor Voltage Rating

Beta

Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
jharwinbarrozo
15.1k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Inspect

PCBWay 4 Layer Stackup

Controls

Properties

Domain

Automotive

Connectivity

WiFi

Application Description

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.

Board Thickness

1.6 mm

Communication Features

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

Bus Type

CAN

Inner Layers Copper Thickness

1 oz

Reliability Target (MTBF)

50000 hours

Outer Layers Copper Thickness

0.5 oz

Manufacturing Quantity Target

Power Management Topology

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

Power Requirements

USB

Operating Temperature

-40 to +85°C

Preferred Distributors

License

http://solderpad.org/licenses/SHL-2.1/

Power Source

Battery

Operating Voltage

12 V

Human Interface

Buttons

Board Stackup Reference

PCBWay 4 Layer Stackup

Main Controller

ESP32-C3

Software

Arduino

Availability & Pricing

Distributor		Qty 1
	Arrow	$2.61–$3.92
	Digi-Key	$6.46–$9.57
	LCSC	$8.13–$8.23
	Mouser	$11.08
	TME	$0.27
	Verical	$2.26–$3.86

Assets

Thumbnail

pcbway-4L.png

id=pcbway-4L

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