# Red Panda Compatible CAN-FD Interface ## Description Automotive USB-C interface based on STM32H725 with three CAN-FD channels, Red Panda-compatible firmware behavior, harness connector, power protection, and connector placement. ## Project Details - **Owner:** jonnythebard9 - **Created:** 8/5/2026 - **Last Updated:** 8/5/2026 - **Visibility:** Public - **Software:** comma.ai panda firmware - **Connectivity:** USB-C - **Domain:** Automotive - **License:** MIT-compatible derivative ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/vasy_skral/usblc6-2sc6~g1b.md) - Manufacturer Name: STMicroelectronics - Role Details: Low-capacitance USB D+/D- protection - Manufacturer Part Number: USBLC6-2SC6 - Symbol Style: parametric-v1 - Role: ESD Protection - Functional Group: USB-C Interface - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Protection - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/06/1d/48/9c/6c/20/4a/b2/CD00050750.pdf/files/CD00050750.pdf/jcr:content/translations/en.CD00050750.pdf - LCSC Part Number: C7519 **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [PESD2CAN](https://www.flux.ai/lcsc/pesd2can~waho.md) - Forward Voltage: 0.9V - Part Type: ESD Protection Devices - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - Role Details: Dual-line 24 V CAN TVS at vehicle connector - Role: Bus Protection - Diode Type: TVS - LCSC Part Number: C2687131 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C2687131.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNeR1VeUlBUR1dfUjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Reverse Voltage: 5V - JLCPCB Part Class: Extended Part - Manufacturer Name: UMW(友台半导体) - Manufacturer Part Number: PESD2CAN - Functional Group: CAN-FD Interfaces **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### D3 — [PESD2CAN](https://www.flux.ai/lcsc/pesd2can~waho.md) - Manufacturer Part Number: PESD2CAN - Manufacturer Name: UMW(友台半导体) - Reverse Voltage: 5V - JLCPCB Part Class: Extended Part - Role Details: Dual-line 24 V CAN TVS at vehicle connector - Datasheet URL: https://www.lcsc.com/datasheet/C2687131.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNeR1VeUlBUR1dfUjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - License: https://creativecommons.org/licenses/by/4.0/ - Diode Type: TVS - LCSC Part Number: C2687131 - Part Type: ESD Protection Devices - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - Role: Bus Protection - Forward Voltage: 0.9V - Functional Group: CAN-FD Interfaces **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### D4 — [PESD2CAN](https://www.flux.ai/lcsc/pesd2can~waho.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C2687131.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNeR1VeUlBUR1dfUjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - JLCPCB Part Class: Extended Part - Reverse Voltage: 5V - Manufacturer Name: UMW(友台半导体) - Manufacturer Part Number: PESD2CAN - Role: Bus Protection - Forward Voltage: 0.9V - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - Part Type: ESD Protection Devices - Role Details: Dual-line 24 V CAN TVS at vehicle connector - LCSC Part Number: C2687131 - Diode Type: TVS - Functional Group: CAN-FD Interfaces **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### D5 — [SS56](https://www.flux.ai/lcsc/ss56~hea6.md) - LCSC Part Number: C65009 - Manufacturer Name: MDD(Microdiode Semiconductor) - Diode Type: Schottky Diode - Role: Reverse Polarity Protection - Reverse Voltage: 60V - Manufacturer Part Number: SS56 - Functional Group: Automotive Power - Forward Voltage: 0.55V - Part Type: Schottky Barrier Diodes (SBD) - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: SMC_L6.9-W5.9-LS7.9-R-RD - Role Details: 60 V 5 A Schottky series protection; automotive qualification not verified - JLCPCB Part Class: Extended Part - Datasheet URL: https://www.lcsc.com/datasheet/C65009.pdf?spm=wm.sxq.inf.ggs___wm.ssy.bg.0.xh&lcsc_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNRTlhaXlxfQlZWUjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D **Pins:** - A [pin 1] - K [pin 2] ### D6 — [SMBJ24A](https://www.flux.ai/cherepanyadima/smbj24a~2b.md) - Part Type: TVS - Manufacturer Name: Taiwan Semiconductor Corporation - Role: Clamping - Functional Group: Automotive Power - Manufacturer Part Number: SMBJ24A-TR - Role Details: 24 V standoff 600 W TVS after fuse; qualification and ISO pulse compliance require validation - Datasheet URL: https://services.taiwansemi.com/storage/resources/datasheet/SMBJ%20SERIES_R2104.pdf **Pins:** - A [pin 2] - K [pin 1] ### F1 — [1210L075/24PR](https://www.flux.ai/adrian95/1210l07524pr~j6w.md) - Role Details: 750 mA hold at 24 V; selected above estimated 0.39 A worst cranking input, hot derating requires PCB review - Part Type: Fuse - Role: Current Limiting - Datasheet URL: https://www.littelfuse.com/media?resourcetype=datasheets&itemid=b3a2be92-83a1-491d-9c6d-dc64451de047&filename=1210l_datasheet_update.pdf - Functional Group: Automotive Power - Manufacturer Name: Littelfuse Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1210L075/24PR **Pins:** - P1 [pin 1] - P2 [pin 2] ### FL1 — [ACT45B-510-2P-TL003](https://www.flux.ai/silicon-yard/act45b-510-2p-tl003.md) - Functional Group: CAN-FD Interfaces - Role: Choke (EMI Filter) - Manufacturer Part Number: ACT45B-510-2P-TL003 - Manufacturer Name: TDK - Symbol Style: parametric-v1 - Part Type: Filter - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: CAN-FD channel common-mode choke - Datasheet URL: https://product.tdk.com/en/system/files/dam/doc/product/emc/emc/cmf_cmc/catalog/cmf_automotive_signal_act45b_en.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### FL2 — [ACT45B-510-2P-TL003](https://www.flux.ai/silicon-yard/act45b-510-2p-tl003.md) - Manufacturer Part Number: ACT45B-510-2P-TL003 - Functional Group: CAN-FD Interfaces - Datasheet URL: https://product.tdk.com/en/system/files/dam/doc/product/emc/emc/cmf_cmc/catalog/cmf_automotive_signal_act45b_en.pdf - Role Details: CAN-FD channel common-mode choke - Role: Choke (EMI Filter) - Symbol Style: parametric-v1 - Manufacturer Name: TDK - Part Type: Filter - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### IC1 — [TCAN3404-Q1](https://www.flux.ai/silicon-yard/tcan3404-q1.md) - Manufacturer Part Number: TCAN3404-Q1 - Manufacturer Name: Texas Instruments - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/1f53a8416ba9b6bbad13f93c8977442b514206718303bbba5c78fa7a5a080d09.pdf - Role Details: One of three 8 Mbps automotive CAN-FD channels - Part Type: Integrated Circuits - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: parametric-v1 - Functional Group: CAN-FD Interfaces - Role: CAN-FD Transceiver **Pins:** - CANH [pin 7] - CANL [pin 6] - GND [pin 2] - RXD [pin 4] - SHDN [pin 5] - STB [pin 8] - TXD [pin 1] - VCC [pin 3] ### IC2 — [TCAN3404-Q1](https://www.flux.ai/silicon-yard/tcan3404-q1.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuits - Role: CAN-FD Transceiver - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/1f53a8416ba9b6bbad13f93c8977442b514206718303bbba5c78fa7a5a080d09.pdf - Manufacturer Part Number: TCAN3404-Q1 - Manufacturer Name: Texas Instruments - Role Details: One of three 8 Mbps automotive CAN-FD channels - Symbol Style: parametric-v1 - Functional Group: CAN-FD Interfaces **Pins:** - CANH [pin 7] - CANL [pin 6] - GND [pin 2] - RXD [pin 4] - SHDN [pin 5] - STB [pin 8] - TXD [pin 1] - VCC [pin 3] ### J1 — [USB4215-03-A](https://www.flux.ai/adrian95/usb4215-03-a~kg3.md) - Role: USB Connector - Part Type: USB C - Package or Case Code: GCT_USB4215-03-A_REVA - Role Details: USB 2.0 device connection; mechanical relative placement deferred to PCB phase - Symbol Style: parametric-v1 - Functional Group: USB-C Interface - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: USB4215-03-A - Datasheet URL: https://gct.co/files/specs/usb4215-spec.pdf - Manufacturer Name: GCT **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND_A [pin A1_B12] - GND_B [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin SH1] - SHIELD [pin SH4] - SHIELD [pin SH2] - SHIELD [pin SH3] - VBUS_A [pin A4_B9] - VBUS_B [pin B4_A9] ### J2 — [C-OBD-II-16M](https://www.flux.ai/goldgames/obd2~vo.md) - Manufacturer Part Number: C-OBD-II-16M - Role Details: SAE J1962 16-pin male; Panda conventional CAN1/2/3 and battery mapping; exact proprietary housing geometry not claimed - Role: Vehicle Connector - Functional Group: Vehicle Harness **Pins:** - +12V [pin 16] - CANHIGH [pin 6] - CANLOW [pin 14] - GND [pin 5] - GNDPWR [pin 4] - NONE [pin 2] - NONE [pin 1] - NONE [pin 3] - NONE [pin 11] - NONE [pin 9] - NONE [pin 15] - NONE [pin 10] - NONE [pin 7] - NONE [pin 12] - NONE [pin 8] - NONE [pin 13] ### J3 — [ARM JTAG SWD 10Pin 0.05" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-005-connector~y0b.md) - Functional Group: Debug and Bring-Up - Role: Debug Connector - Symbol Style: parametric-v1 - Manufacturer Name: Analog Devices - Part Type: Connector - Role Details: SWDIO, SWCLK, NRST, 3V3 reference and GND - Manufacturer Part Number: FTSH-105-01-L-DV-007-K - Datasheet URL: https://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf **Pins:** - ~RESET~ [pin 10] - GND [pin 5] - GND [pin 3] - GNDDetect [pin 9] - NC/TDI [pin 8] - SWDCLK/TCK [pin 4] - SWDIO/TMS [pin 2] - SWO/TDO [pin 6] - VTref [pin 1] ### LED1 — [150060RS73220](https://www.flux.ai/vasy_skral/150060rs73220~kj9.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060RS73220.pdf - Role: Status LED - Part Type: LED - Functional Group: Status Indicators - Manufacturer Part Number: 150060RS73220 - Manufacturer Name: Würth Elektronik - Role Details: Red Panda firmware LED GPIO PE4 **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [150060VS55040](https://www.flux.ai/adrian95/150060vs55040~c2q.md) - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060VS55040.pdf - Part Type: LED - Role: Status LED - Manufacturer Name: Würth Elektronik - Manufacturer Part Number: 150060VS55040 - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: Status Indicators - Role Details: Red Panda firmware LED GPIO PE3 **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [150060BS73220](https://www.flux.ai/vasy_skral/150060bs73220~6g.md) - Role Details: Red Panda firmware LED GPIO PE2 - Manufacturer Part Number: 150060BS73220 - Manufacturer Name: Würth Elektronik - Role: Status LED - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: Status Indicators - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060BS73220.pdf **Pins:** - A [pin 2] - K [pin 1] ### U1 — [STM32H725ZGT6](https://www.flux.ai/lcsc/stm32h725zgt6~oktk.md) - LCSC Part Number: C730156 - Package or Case Code: LQFP-144_L20.0-W20.0-P0.50-LS22.0-BL - Manufacturer Name: ST(意法半导体) - Manufacturer Part Number: STM32H725ZGT6 - Product Info Url: https://lcsc.com/product-detail/Pre-ordered-MCUs_STMicroelectronics-STM32H725ZGT6_C730156.html - Role Details: STM32H725 running comma.ai panda-derived firmware; 3x FDCAN and USB FS - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2009021033_STMicroelectronics-STM32H725ZGT6_C730156.pdf - JLCPCB Part Class: Extended Part - Part Type: ST Microelectronics - Functional Group: MCU Core - Role: Main Controller **Pins:** - BOOT0 [pin 135] - NRST [pin 27] - PA0 [pin 37] - PA1 [pin 38] - PA10 [pin 99] - PA11 [pin 100] - PA12 [pin 101] - PA13 [pin 102] - PA14 [pin 107] - PA15 [pin 108] - PA2 [pin 39] - PA3 [pin 40] - PA4 [pin 43] - PA5 [pin 44] - PA6 [pin 45] - PA7 [pin 46] - PA8 [pin 97] - PA9 [pin 98] - PB0 [pin 49] - PB1 [pin 50] - PB10 [pin 66] - PB11 [pin 67] - PB12 [pin 72] - PB13 [pin 73] - PB14 [pin 74] - PB15 [pin 75] - PB2 [pin 51] - PB3 [pin 130] - PB4 [pin 131] - PB5 [pin 132] - PB6 [pin 133] - PB7 [pin 134] - PB8 [pin 136] - PB9 [pin 137] - PC0 [pin 28] - PC1 [pin 29] - PC10 [pin 109] - PC11 [pin 110] - PC12 [pin 111] - PC13 [pin 9] - PC14-OSC32_IN [pin 10] - PC15-OSC32_OUT [pin 11] - PC2_C [pin 30] - PC3_C [pin 31] - PC4 [pin 47] - PC5 [pin 48] - PC6 [pin 93] - PC7 [pin 94] - PC8 [pin 95] - PC9 [pin 96] - PD0 [pin 112] - PD1 [pin 113] - PD10 [pin 78] - PD11 [pin 81] - PD12 [pin 82] - PD13 [pin 83] - PD14 [pin 84] - PD15 [pin 85] - PD2 [pin 114] - PD3 [pin 115] - PD4 [pin 116] - PD5 [pin 117] - PD6 [pin 120] - PD7 [pin 121] - PD8 [pin 76] - PD9 [pin 77] - PDR_ON [pin 142] - PE0 [pin 138] - PE1 [pin 139] - PE10 [pin 60] - PE11 [pin 61] - PE12 [pin 62] - PE13 [pin 63] - PE14 [pin 64] - PE15 [pin 65] - PE2 [pin 1] - PE3 [pin 2] - PE4 [pin 3] - PE5 [pin 4] - PE6 [pin 5] - PE7 [pin 57] - PE8 [pin 58] - PE9 [pin 59] - PF10 [pin 24] - PF11 [pin 52] - PF14 [pin 53] - PF15 [pin 54] - PF6 [pin 20] - PF7 [pin 21] - PF8 [pin 22] - PF9 [pin 23] - PG10 [pin 123] - PG11 [pin 124] - PG12 [pin 125] - PG13 [pin 126] - PG14 [pin 127] - PG6 [pin 86] - PG7 [pin 87] - PG8 [pin 88] - PG9 [pin 122] - PH0-OSC_IN [pin 25] - PH1-OSC_OUT [pin 26] - VBAT [pin 8] - VCAP [pin 140] - VCAP [pin 103] - VCAP [pin 68] - VDD [pin 7] - VDD [pin 79] - VDD [pin 19] - VDD [pin 32] - VDD [pin 71] - VDD [pin 129] - VDD [pin 42] - VDD [pin 13] - VDD [pin 56] - VDD [pin 144] - VDD [pin 106] - VDD [pin 92] - VDD [pin 119] - VDD33USB [pin 91] - VDD50USB [pin 90] - VDDA [pin 36] - VDDLDO [pin 70] - VDDLDO [pin 143] - VDDLDO [pin 105] - VDDSMPS [pin 16] - VFBSMPS [pin 17] - VLXSMPS [pin 15] - VREF+ [pin 35] - VSS [pin 55] - VSS [pin 104] - VSS [pin 141] - VSS [pin 18] - VSS [pin 41] - VSS [pin 89] - VSS [pin 69] - VSS [pin 33] - VSS [pin 128] - VSS [pin 118] - VSS [pin 80] - VSS [pin 6] - VSS [pin 12] - VSSA [pin 34] - VSSSMPS [pin 14] ### U2 — [TCAN3404-Q1](https://www.flux.ai/silicon-yard/tcan3404-q1.md) - Symbol Style: parametric-v1 - Role Details: One of three 8 Mbps automotive CAN-FD channels - Functional Group: CAN-FD Interfaces - Role: CAN-FD Transceiver - Manufacturer Part Number: TCAN3404-Q1 - Manufacturer Name: Texas Instruments - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/1f53a8416ba9b6bbad13f93c8977442b514206718303bbba5c78fa7a5a080d09.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuits **Pins:** - CANH [pin 7] - CANL [pin 6] - GND [pin 2] - RXD [pin 4] - SHDN [pin 5] - STB [pin 8] - TXD [pin 1] - VCC [pin 3] ### U5 — [LM65645SRZTRQ1](https://www.flux.ai/silicon-yard/lm65645srztrq1.md) - Part Type: Power Management - Symbol Style: parametric-v1 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/66a5596410ea65e697b50148afbb994976ab01079629c675a073b9d02c373bf6.pdf - Role Details: 3.3 V fixed output; budget target 0.6 A peak, regulator rated 4.5 A - Package or Case Code: 20-WFQFN Exposed Pad - Functional Group: Automotive Power - Manufacturer Part Number: LM65645SRZTRQ1 - Role: Buck Regulator - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - BIAS [pin 20] - BOOT [pin 15] - DAP [pin 21] - EN_UVLO [pin 7] - FB [pin 3] - MODE_SYNC [pin 5] - NC [pin 18] - NC [pin 10] - NC [pin 12] - NC [pin 16] - NC1 [pin 1] - NC2 [pin 8] - PG [pin 2] - PGND1 [pin 9] - PGND2 [pin 19] - RT [pin 6] - SW1 [pin 13] - SW2 [pin 14] - VCC [pin 4] - VIN1 [pin 11] - VIN2 [pin 17] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jonnythebard9/red-panda-compatible-can-fd-interface~w2](https://www.flux.ai/jonnythebard9/red-panda-compatible-can-fd-interface~w2).* --- *Generated from [https://www.flux.ai/jonnythebard9/red-panda-compatible-can-fd-interface~w2](https://www.flux.ai/jonnythebard9/red-panda-compatible-can-fd-interface~w2)*