# CAN Gateway V2 ## Description Teensy 4.0 Dual CAN-FD Gateway with Switchable Bus Termination ## Project Details - **Owner:** deml8194 - **Created:** 11/20/2025 - **Last Updated:** 11/21/2025 - **Visibility:** Public - **Protection:** Reverse Polarity, TVS, Fuse - **ERC Status:** No remaining violations - **BB_max_x:** 75.326mm - **Microcontroller:** Teensy 4.0 - **BB_max_y:** 715.4mm - **Hole5VisibilityValidation:** Hole5 is visible in the PCB layout and meets M5 NPTH design specifications - **BB_min_x:** -59.338mm - **BoardOutlineExtents:** 154.75mm x 94.78mm - **BB_min_y:** -955.1mm - **Hole5Coordinates:** 10.00mm, 10.00mm from board origin - **Board_width:** 154.75 - **Board_height:** 94.78 - **Power Requirements:** 12V - **System Architecture:** Teensy 4.0 Dual CAN-FD Gateway with: 12V DC input, reverse-polarity protection, TVS, fuse, buck to 5V, 3.3V LDO supply, two CAN-FD transceivers with DB9 connectors, and status LEDs. - **Connectivity:** CAN-FD - **Domain:** Automotive - **Board Outline Visible:** true - **DRC Status:** No remaining violations ## Key Components ### D1 — [MBRA340T3G](https://www.flux.ai/vasy_skral/mbra340t3g~p1.md) - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mbra340t3-d.pdf - Manufacturer Part Number: MBRA340T3G - Role: Protection - Manufacturer Name: onsemi - Role Details: Reverse polarity protection diode on 12 V input - Part Type: Diode **Pins:** - A [pin 2] - K [pin 1] ### D2 — [SM6T12A](https://www.flux.ai/jecstronic/sm6t12a~mln.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection - Datasheet URL: https://www.mouser.com/datasheet/2/389/sm6t100a-1916590.pdf - Manufacturer Part Number: SM6T12A - Role Details: Transient suppression for 12V input after fuse - Manufacturer Name: STMicroelectronics - Part Type: Diode **Pins:** - A [pin 2] - K [pin 1] ### D3 — [NUP2105L](https://www.flux.ai/kicad-part-library/nup2105l~bk1.md) - Role: Protection - Datasheet URL: https://www.onsemi.com/pub_link/Collateral/NUP2105L-D.PDF - Manufacturer Name: Texas Instruments Inc. - Role Details: ESD protection for CANH and CANL lines at each DB9 connector - Package or Case Code: SOT-23 - Manufacturer Part Number: NUP2105L **Pins:** - A [pin 3] - K [pin 1] - K [pin 2] ### D4 — [NUP2105L](https://www.flux.ai/kicad-part-library/nup2105l~bk1.md) - Role: Protection - Manufacturer Name: Texas Instruments Inc. - Datasheet URL: https://www.onsemi.com/pub_link/Collateral/NUP2105L-D.PDF - Role Details: ESD protection for CANH and CANL lines at each DB9 connector - Manufacturer Part Number: NUP2105L - Package or Case Code: SOT-23 **Pins:** - A [pin 3] - K [pin 1] - K [pin 2] ### F1 — [1812L200/12DR](https://www.flux.ai/jecstronic/1812l20012dr~98l.md) - Manufacturer Name: Littelfuse Inc. - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/resettable_ptcs/littelfuse_ptc_1812l_datasheet.pdf.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Fuse - Manufacturer Part Number: 1812L150/12DR - Role: Protection - Role Details: Series overcurrent protection for the 12V input - Current Rating: 2A **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [DB9_Male_MountingHoles](https://www.flux.ai/robertdalesmith/db9malemountingholes~uz.md) - Role: Connector - Manufacturer Part Number: 2301843-2 - Manufacturer Name: TE Connectivity AMP Connectors - Datasheet URL: https://www.te.com/usa-en/product-2301843-2.datasheet.pdf - Role Details: CAN1 DB9 male connector (pin-2=CANL, pin-7=CANH, pin-9=+12V input, pin-3=GND) - Purchase Url: https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/2301843-2/7776544 - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - PAD [pin 0] ### J2 — [DB9_Male_MountingHoles](https://www.flux.ai/robertdalesmith/db9malemountingholes~uz.md) - Role: Connector - Part Type: Connector - Datasheet URL: https://www.te.com/usa-en/product-2301843-2.datasheet.pdf - Role Details: CAN2 DB9 male connector (pin-2=CANL, pin-7=CANH, pin-9=+12V input, pin-3=GND) - Edge Alignment Lock: true - Manufacturer Part Number: 2301843-2 - Purchase Url: https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/2301843-2/7776544 - Manufacturer Name: TE Connectivity AMP Connectors **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - PAD [pin 0] ### LED1 — [SM0805HCL](https://www.flux.ai/adrian95/sm0805hcl~2dj.md) - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.bivar.com/parts_content/Datasheets/SM0805HCL.pdf - Manufacturer Name: Bivar Inc. - Manufacturer Part Number: SM0805HCL - Role Details: Status indicator LED for CAN bus activity and error **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [SM0805HCL](https://www.flux.ai/adrian95/sm0805hcl~2dj.md) - Manufacturer Part Number: SM0805HCL - Part Type: LED - Datasheet URL: https://www.bivar.com/parts_content/Datasheets/SM0805HCL.pdf - Manufacturer Name: Bivar Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Status indicator LED for CAN bus activity and error **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [SM0805HCL](https://www.flux.ai/adrian95/sm0805hcl~2dj.md) - Datasheet URL: https://www.bivar.com/parts_content/Datasheets/SM0805HCL.pdf - Manufacturer Name: Bivar Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Manufacturer Part Number: SM0805HCL - Role Details: Status indicator LED for CAN bus activity and error **Pins:** - A [pin 2] - K [pin 1] ### LED4 — [SM0805HCL](https://www.flux.ai/adrian95/sm0805hcl~2dj.md) - Part Type: LED - Role Details: Status indicator LED for CAN bus activity and error - Manufacturer Name: Bivar Inc. - Datasheet URL: https://www.bivar.com/parts_content/Datasheets/SM0805HCL.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SM0805HCL **Pins:** - A [pin 2] - K [pin 1] ### RT1 — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Role Details: 120Ω termination resistor for CAN1 bus - Resistance: 120Ω - Package: R_0603_1608Metric - Part Type: Resistor - Role: Termination **Pins:** - P1 [pin 1] - P2 [pin 2] ### RT2 — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Role: Termination - Role Details: 120Ω termination resistor for CAN2 bus - Package: R_0603_1608Metric - Part Type: Resistor - Resistance: 120Ω **Pins:** - P1 [pin 1] - P2 [pin 2] ### SW1 — [OS102011MS2QN1](https://www.flux.ai/adrian95/os102011ms2qn1~wd3.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ckswitches.com/media/1428/os.pdf - Role Details: Enable CAN1 termination resistor - Role: Switching - Manufacturer Part Number: OS102011MS2QN1 - Part Type: Switch - Manufacturer Name: C&K - Silkscreen: TERM1 ON=120Ω **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### SW2 — [OS102011MS2QN1](https://www.flux.ai/adrian95/os102011ms2qn1~wd3.md) - Silkscreen: TERM2 ON=120Ω - Manufacturer Name: C&K - Role Details: Enable CAN2 termination resistor - Manufacturer Part Number: OS102011MS2QN1 - Part Type: Switch - Role: Switching - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ckswitches.com/media/1428/os.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### U1 — [MCP2561FD-E/P](https://www.flux.ai/vasy_skral/mcp2561fd-ep~suj.md) - Role Details: CAN-FD transceiver interfacing Teensy to CAN bus - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/20005284A.pdf - Role: Modulation / Demodulation - Manufacturer Part Number: MCP2561FD-E/P - Manufacturer Name: Microchip - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - CANH [pin 7] - CANL [pin 6] - RXD [pin 4] - SPLIT [pin 5] - STBY [pin 8] - TXD [pin 1] - VDD [pin 3] - VSS [pin 2] ### U1 — [Teensy 4.0](https://www.flux.ai/vasy_skral/teensy-4p0~h16.md) - Manufacturer Name: SparkFun Electronics - Part Type: Evaluation Platform - Role Details: Main MCU - Role: Microcontroller - Manufacturer Part Number: DEV-15583 - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: Parametric - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Sparkfun%20PDFs/DEV-15583_Web.pdf **Pins:** - 0 [pin 0] - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 2 [pin 2] - 20 [pin 20] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 3 [pin 3] - 3.3V_1 [pin 3.3V_1] - 3.3V_2 [pin 3.3V_2] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - G1 [pin G1] - G2 [pin G2] - G3 [pin G3] - ON/OFF [pin ON-OFF] - PROGRAM [pin PGM] - VBAT [pin VBAT] - VIN [pin VIN] ### U2 — [MCP2561FD-E/P](https://www.flux.ai/vasy_skral/mcp2561fd-ep~suj.md) - Role Details: CAN-FD transceiver interfacing Teensy to CAN bus - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Name: Microchip - Manufacturer Part Number: MCP2561FD-E/P - Role: Modulation / Demodulation - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/20005284A.pdf **Pins:** - CANH [pin 7] - CANL [pin 6] - RXD [pin 4] - SPLIT [pin 5] - STBY [pin 8] - TXD [pin 1] - VDD [pin 3] - VSS [pin 2] ### U3 — [TPS561208DDCR](https://www.flux.ai/lcsc/tps561208ddcr~xa28.md) - Manufacturer Name: TI(德州仪器) - LCSC Part Number: C138335 - Role: Power Conversion - Role Details: Step-down 12 V → 5 V buck converter for logic rails - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810181617_Texas-Instruments-TPS561208DDCR_C138335.pdf - JLCPCB Part Class: Extended Part - Package or Case Code: TSOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR - Product Info Url: https://lcsc.com/product-detail/Others_Texas-Instruments_TPS561208DDCR_Texas-Instruments-TI-TPS561208DDCR_C138335.html - Part Type: DC-DC Converters - Manufacturer Part Number: TPS561208DDCR **Pins:** - EN [pin 5] - GND [pin 1] - SW [pin 2] - VBST [pin 6] - VFB [pin 4] - VIN [pin 3] ### U4 — [MCP1825S-3302E/DB](https://www.flux.ai/adrian95/mcp1825s-3302edb~3re.md) - Datasheet URL: https://datasheet.datasheetarchive.com/originals/distributors/SFDatasheet-4/sf-00090042.pdf - Part Type: Power Management - Manufacturer Name: Microchip - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MCP1825S-3302E/DB - Package or Case Code: SOT230P700X180-4N - Role Details: 3.3 V LDO regulator for MCU and CAN-FD transceivers - Role: Power Conversion **Pins:** - GND_(TAB)_1 [pin 2] - GND_(TAB)_2 [pin 4] - VIN [pin 1] - VOUT [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/deml8194/can-gateway-v2~br](https://www.flux.ai/deml8194/can-gateway-v2~br).* --- *Generated from [https://www.flux.ai/deml8194/can-gateway-v2~br](https://www.flux.ai/deml8194/can-gateway-v2~br)*