# ESP32 C3 Can Bus ## Description Zero-Drain Automotive ESP32-C3 CAN Node with TJA1043T Power Management ## Project Details - **Owner:** mrjosejr - **Created:** 12/11/2025 - **Last Updated:** 1/30/2026 - **Visibility:** Public - **License:** http://solderpad.org/licenses/SHL-2.1/ - **Power Requirements:** Battery - **Connectivity:** WiFi - **Domain:** Automotive - **Manufacturing Quantity Target:** 10 - **Project Architecture (Mermaid):** flowchart TD ESP32_C3[ESP32-C3-MINI-1-N4] TJA1043[TJA1043T/118 CAN Transceiver] MP2315[MP2315SGJ-Z 5V Regulator] AP2112[AP2112K-3.3 3.3V Regulator] NUP2105L[Onsemi NUP2105L TVS Diode] SS34[SS34 Schottky Diode] JST_XH[JST-XH 4-pin Connector] subgraph Power_Rails BAT12V[BAT_12V (via JST Pin1)] VCC12V[VCC_12V] V5V[5V Rail] V3V3[3.3V Rail] end BAT12V --> NUP2105L NUP2105L --> SS34 --> VCC12V VCC12V --> MP2315 MP2315 --> V5V V5V --> AP2112 AP2112 --> V3V3 VCC12V --> TJA1043_VBAT[TJA1043 VBAT Pin] V5V --> TJA1043_VCC[TJA1043 VCC Pin] V3V3 --> TJA1043_VIO[TJA1043 VIO Pin] V3V3 --> ESP32_C3 ESP32_C3 -->|GPIO3 TXD| TJA1043 ESP32_C3 -->|GPIO2 RXD| TJA1043 ESP32_C3 -->|GPIO0 EN| TJA1043 ESP32_C3 -->|GPIO1 STB_N| TJA1043 TJA1043 -->|INH| MP2315 TJA1043 -->|WAKE to GND| GND JST_XH -->|CANL| TJA1043 JST_XH -->|CANH| TJA1043 subgraph Termination SJ1[Solder Jumper 3-pad] R_TERM[120 Ohm Resistor] end JST_XH -->|CANL| SJ1 JST_XH -->|CANH| SJ1 SJ1 --> R_TERM R_TERM --> SJ1 - **Operating Voltage:** 12V - **Reference Design URL:** https://www.nxp.com/docs/en/data-sheet/TJA1043.pdf - **Forks:** 1 - **Copies:** 1 ## Key Components ### AP2112K — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1.md) - Datasheet URL: Diodes Incorporated - Manufacturer Name: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Manufacturer Part Number: AP2112K-3.3TRG1 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### D1 — [Schottky Diode](https://www.flux.ai/corynrobinson/schottky-diode.md) - Package or Case Code: D_SOD-123 - Part Type: Diode - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mbr0520lt1-d.pdf - Current: 0.5A - Breakdown Voltage: 20V - Manufacturer Part Number: MBR0520LT1G - Manufacturer Name: onsemi - Purchase Url: https://octopart.com/mbr0520lt1g-onsemi-2933?r=sp **Pins:** - A - K ### ESP32 C3 — [ESP32-C3-WROOM-02-N4](https://www.flux.ai/adrian95/esp32-c3-wroom-02-n4.md) - Part Type: Module - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf - Manufacturer Name: Espressif Systems - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ESP32-C3-WROOM-02-N4 **Pins:** - 3V3 [pin 1] - EN [pin 2] - GND_1 [pin 9] - GND_10 [pin 27] - GND_2 [pin 19] - GND_3 [pin 20] - GND_4 [pin 21] - GND_5 [pin 22] - GND_6 [pin 23] - GND_7 [pin 24] - GND_8 [pin 25] - GND_9 [pin 26] - IO0 [pin 18] - IO1 [pin 17] - IO10 [pin 10] - IO18 [pin 13] - IO19 [pin 14] - IO2 [pin 16] - IO3 [pin 15] - IO4 [pin 3] - IO5 [pin 4] - IO6 [pin 5] - IO7 [pin 6] - IO8 [pin 7] - IO9 [pin 8] - RXD [pin 11] - TXD [pin 12] ### J1 — [S4B-PH-K-S(LF)(SN)](https://www.flux.ai/jecstronic/s4b-ph-k-slfsn.md) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S4B-PH-K-S(LF)(SN) - Manufacturer Name: S4B-PH-K-S(LF)(SN) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### MP2315SGJ-Z — [MP2315SGJ-Z](https://www.flux.ai/monolithicpower/mp2315sgj-z.md) - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/M/P/MP2315S_1078_1.jpg - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/1078?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Manufacturer Part Number: MP2315SGJ-Z - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2315S - Package or Case Code: TSOT23-8_MP2315S_MNP - Manufacturer Name: Monolithic Power Systems **Pins:** - AAM [pin 1] - BST [pin 5] - EN [pin 6] - FB [pin 8] - GND [pin 4] - IN [pin 2] - SW [pin 3] - VCC [pin 7] ### O1 — [OBD2 Connector](https://www.flux.ai/nucleon/obd2-connector.md) - Manufacturer Name: Texas Instruments Inc. - Manufacturer Part Number: C-OBD-II-16M **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 12V [pin 16] - 13 [pin 13] - 15 [pin 15] - 2 [pin 2] - 3 [pin 3] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - CAN-H [pin 6] - CAN-L [pin 14] - GND [pin 4] - GND [pin 5] ### O2 — [OBD2 Connector](https://www.flux.ai/nucleon/obd2-connector.md) - Manufacturer Name: Texas Instruments Inc. - Manufacturer Part Number: C-OBD-II-16M **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 12V [pin 16] - 13 [pin 13] - 15 [pin 15] - 2 [pin 2] - 3 [pin 3] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - CAN-H [pin 6] - CAN-L [pin 14] - GND [pin 4] - GND [pin 5] ### Protection — [NUP2105LT1G](https://www.flux.ai/jharwinbarrozo/nup2105lt1g.md) - Manufacturer Part Number: NUP2105LT1G - Datasheet URL: https://www.onsemi.com/pdf/datasheet/nup2105l-d.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: ON Semiconductor - Part Type: Diode **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### TJA1043 — [TJA1043T/1J](https://www.flux.ai/adrian95/tja1043t1j.md) - Datasheet URL: https://www.nxp.com/docs/en/data-sheet/TJA1043.pdf - Manufacturer Part Number: TJA1043T/1J - Manufacturer Name: NXP USA Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit **Pins:** - CANH [pin 13] - CANL [pin 12] - EN [pin 6] - ERR_N [pin 8] - GND [pin 2] - INH [pin 7] - RXD [pin 4] - SPLIT [pin 11] - STB_N [pin 14] - TXD [pin 1] - VBAT [pin 10] - VCC [pin 3] - VIO [pin 5] - WAKE [pin 9] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/mrjosejr/esp32-c3-can-bus](https://www.flux.ai/mrjosejr/esp32-c3-can-bus).* --- *Generated from [https://www.flux.ai/mrjosejr/esp32-c3-can-bus](https://www.flux.ai/mrjosejr/esp32-c3-can-bus)*