# ESP32-S3-WROOM-1 Reference Design ## Description ESP32-S3 Automotive IoT Reference Board with 12V Protected Front-End, AXP192 PMIC, CP2102N USB-UART, SIM800C GSM, SX1262 LoRa, and microSD SPI Storage (#SIM800C #SX1262 #CP2102N #AXP192 #Automotive) ## Project Details - **Owner:** harrington40 - **Created:** 1/4/2025 - **Last Updated:** 12/7/2025 - **Visibility:** Public - **ChargerReg0x33:** 0xA8 - **Power Requirements:** USB - **Charger_CV:** 4.15V - **I2C_Address:** 0x34 - **OutputEnable_Mask:** 0x74 - **DCDC1_Code:** 0x68 - **LDO2_Code:** 0x0F - **Last ERC/DRC Run:** All available ERC (decoupling_caps, resistor_power_rating, pull_up_pull_down, capacitor_voltage_rating, parts_available) and DRC (airwires, floating_copper, overlapping_copper, missing_footprints, invalid_layer, overlapping_fills, deprecated_rules, trace_corner_radius, protected_intrusions) checks retrieved via @review; see review panel for detailed issue list. - **System Architecture:** flowchart TD A[VIN_12V Front-End (fuse, SMBJ24A TVS, PFET)] -->|VIN_12V| B[12V to 5V Buck (VBUS_5V)] A -->|VIN_12V| C[AXP192 PMIC (VBAT & VBUS_5V -> SYS_3V3 & SYS_BATT)] B -->|VBUS_5V| C C -->|SYS_3V3| D[ESP32-S3-WROOM-1] C -->|SYS_BATT| D D -->|UART| E[SIM800C GSM Module] D -->|SPI| F[SX1262 LoRa Module] D -->|UART| G[CP2102N USB-UART Bridge] classDef nets fill:#f9f,stroke:#333,stroke-width:1px; H[Global Nets: VIN_12V, VBAT, VBUS_5V, SYS_3V3, SYS_BATT, IGN_SENSE]:::nets - **LDO3_Code:** 0x0F - **License:** https://creativecommons.org/licenses/by/4.0/ - **DCDC3_Code:** 0x68 - **Charger_CC:** 512 mA - **Domain:** Automotive - **Connectivity:** WiFi - **Forks:** 26 ## Key Components ### Card1 — [SIM-015-C](https://www.flux.ai/lcsc/sim-015-c~ciuc.md) - Part Type: SIM Card Connectors - JLCPCB Part Class: Extended Part - Manufacturer Name: SOFNG(硕方) - Package or Case Code: SIM-SMD_SIM-015 - Role: Connector - Role Details: SIM card socket for SIM800C - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2009111836_SOFNG-SIM-015-C_C191727.pdf - LCSC Part Number: C191727 - Product Info Url: https://lcsc.com/product-detail/Card-Sockets_SOFNG-SIM-015_C191727.html - Manufacturer Part Number: SIM-015-C **Pins:** - CLK [pin 5] - DAT0 [pin 7] - GND [pin 10] - GND [pin 2] - GND [pin 10] - GND [pin 10] - GND [pin 10] - I/O [pin 6] - MCMD [pin 8] - RST [pin 3] - SW [pin 9] - VCC [pin 1] - VPP [pin 4] ### D1 — [Schottky Diode](https://www.flux.ai/corynrobinson/schottky-diode~hs.md) - Part Type: Diode - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mbr0520lt1-d.pdf - Purchase Url: https://octopart.com/mbr0520lt1g-onsemi-2933?r=sp - Manufacturer Name: onsemi - Package or Case Code: D_SOD-123 - Current: 0.5A - Breakdown Voltage: 20V - Manufacturer Part Number: MBR0520LT1G **Pins:** - A - K ### D2 — [SP0505BAHT](https://www.flux.ai/kicad-part-library/sp0505baht~b1s.md) - Role Details: ESD protection for microSD data and CMD lines - Role: Protection - Package or Case Code: SOT-23-6 - Manufacturer Name: Texas Instruments Inc. - Manufacturer Part Number: SP0505BAHT - Package: SOT-23-6 - Datasheet URL: http://www.littelfuse.com//media/files/littelfuse/technical%20resources/documents/data%20sheets/sp05xxba.pdf **Pins:** - A [pin 2] - K [pin 1] - K [pin 6] - K [pin 4] - K [pin 3] - K [pin 5] ### D3 — [ESD321DPYR](https://www.flux.ai/corvus96/esd321dpyr~2s.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/esd321.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1690491326127&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fesd321 - Manufacturer Part Number: ESD321DPYR - Role: Protection - Role Details: ESD protection for USB D+ - Manufacturer Name: Texas Instruments **Pins:** - GND [pin 2] - IO [pin 1] ### D4 — [ESD321DPYR](https://www.flux.ai/corvus96/esd321dpyr~2s.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/esd321.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1690491326127&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fesd321 - Manufacturer Part Number: ESD321DPYR - Role: Protection - Role Details: ESD protection for USB D- - Manufacturer Name: Texas Instruments **Pins:** - GND [pin 2] - IO [pin 1] ### F1 — [3405.0169.24](https://www.flux.ai/lcsc/3405p0169p24~e8da.md) - Manufacturer Name: SCHURTER - LCSC Part Number: C1972559 - Part Type: Automotive Fuses - JLCPCB Part Class: Extended Part - Role: Protection - Manufacturer Part Number: 3405.0169.24 - Package or Case Code: FUSE-SMD_L6.1-W2.6 - Role Details: Automotive fuse on VIN_12V input **Pins:** - 1 [pin 1] - 2 [pin 2] ### IC1 — [TPS62160DSGR](https://www.flux.ai/vasyl/tps62160dsgr~zy.md) - Part Type: Integrated Circuit - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=http%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Ftps62160 - Manufacturer Name: Texas Instruments - Manufacturer Part Number: TPS62160DSGR **Pins:** - AGND [pin 4] - EN [pin 3] - FB [pin 5] - PAD [pin 9] - PG [pin 8] - PGND [pin 1] - SW [pin 7] - VIN [pin 2] - VOS [pin 6] ### IC2 — [Wio-SX1262 Wireless Module](https://www.flux.ai/seeedstudio/wio-sx1262-wireless-module~3b.md) - Manufacturer Part Number: 114993390 - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: SX1262 LoRa module powered by SYS_3V3, SPI interface - Part Type: RF Transceiver - Role: RF Transceiver - Datasheet URL: https://files.seeedstudio.com/products/SenseCAP/Wio_SX1262/Wio-SX1262_Module_Datasheet.pdf - Package or Case Code: 114993390 - Package: MODULE - Manufacturer Name: Seeed Technology Co., Ltd **Pins:** - ANT [pin 9] - BUSY [pin 11] - DIO1 [pin 12] - GND_1 [pin 7] - GND_2 [pin 10] - MISO [pin 2] - MOSI [pin 3] - NRST [pin 5] - NSS [pin 6] - RF_SW_ [pin 1] - SCK [pin 4] - VCC [pin 8] ### J1 — [Pin Header 01x16 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x16-254mm-vertical~9zm.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_16 [pin 16] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### J2 — [TYPE-C-31-M-12](https://www.flux.ai/vasyl/type-c-31-m-12~tm.md) - Manufacturer Part Number: TYPE-C-31-M-12 - Part Type: Connector - Datasheet URL: https://www.snapeda.com/parts/TYPE-C-31-M-12/HRO%20Electronics%20Co.,%20Ltd./datasheet/ - Manufacturer Name: ROHS **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1B12] - GND__1 [pin B1A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin S1] - SHIELD__1 [pin S2] - SHIELD__2 [pin S3] - SHIELD__3 [pin S4] - VBUS [pin A4B9] - VBUS__1 [pin B4A9] ### J3 — [Pin Header 01x16 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x16-254mm-vertical~9zm.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_16 [pin 16] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### J4 — [ST-TF-003A](https://www.flux.ai/adrian95/st-tf-003a~3op.md) - Role Details: microSD Card Socket with card-detect - Part Type: Connector - Datasheet URL: https://www.snapeda.com/parts/ST-TF-003A/Suntech/view-part/?ref=search&t=micro%20sd%20socket - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Manufacturer Part Number: ST-TF-003A - Manufacturer Name: Suntech **Pins:** - CD [pin G2] - CD2 [pin G3] - CS [pin 2] - DI [pin 3] - DO [pin 7] - GND [pin G4] - GND [pin G1] - GND [pin 6] - NC [pin 1] - RSV [pin 8] - SCK [pin 5] - SHIELD [pin 9] - VCC [pin 4] ### J5 — [U.FL-R-SMT-1(10)](https://www.flux.ai/jecstronic/upfl-r-smt-110~du.md) - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Package: CONN-SMD - Manufacturer Name: Hirose Electric Co Ltd - Role Details: u.FL coaxial antenna connector - Manufacturer Part Number: U.FL-R-SMT-1(10) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/EDC3-302540-10.tif.pdf **Pins:** - Center_Contact [pin 2] - Outer_Contact [pin 1] - Outer_Contact [pin 3] ### LED1 — [LED-0402-Template](https://www.flux.ai/vasyl/led-0402-template~664.md) - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED-0402-Template](https://www.flux.ai/vasyl/led-0402-template~664.md) - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [LED-0402-Template](https://www.flux.ai/vasyl/led-0402-template~664.md) - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [PTS815](https://www.flux.ai/vasy_skral/pts815~6b.md) - Manufacturer Part Number: PTS815 SJM 250 SMTR LFS - Manufacturer Name: C&K - Datasheet URL: https://www.ckswitches.com/media/2728/pts815.pdf - Part Type: Switch **Pins:** - ~1 [pin 1] - ~2 [pin 2] - ~3 [pin 3] - ~4 [pin 4] ### SW2 — [PTS815](https://www.flux.ai/vasy_skral/pts815~6b.md) - Manufacturer Part Number: PTS815 SJM 250 SMTR LFS - Manufacturer Name: C&K - Part Type: Switch - Datasheet URL: https://www.ckswitches.com/media/2728/pts815.pdf **Pins:** - ~1 [pin 1] - ~2 [pin 2] - ~3 [pin 3] - ~4 [pin 4] ### U1 — [ESP32-S3-WROOM-1-N8R8](https://www.flux.ai/adrian95/esp32-s3-wroom-1-n8r8~na1.md) - Manufacturer Name: Espressif Systems - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ESP32-S3-WROOM-1-N8R8 - Part Type: Module - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-s3-wroom-1_wroom-1u_datasheet_en.pdf **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 41_8] - GND [pin 41_2] - GND [pin 41_3] - GND [pin 41_1] - GND [pin 41_5] - GND [pin 41_7] - GND [pin 40] - GND [pin 41_9] - GND [pin 41_4] - GND [pin 1] - GND [pin 41_6] - IO0 [pin 27] - IO1 [pin 39] - IO10 [pin 18] - IO11 [pin 19] - IO12 [pin 20] - IO13 [pin 21] - IO14 [pin 22] - IO15 [pin 8] - IO16 [pin 9] - IO17 [pin 10] - IO18 [pin 11] - IO19 [pin 13] - IO2 [pin 38] - IO20 [pin 14] - IO21 [pin 23] - IO3 [pin 15] - IO35 [pin 28] - IO36 [pin 29] - IO37 [pin 30] - IO38 [pin 31] - IO39 [pin 32] - IO4 [pin 4] - IO40 [pin 33] - IO41 [pin 34] - IO42 [pin 35] - IO45 [pin 26] - IO46 [pin 16] - IO47 [pin 24] - IO48 [pin 25] - IO5 [pin 5] - IO6 [pin 6] - IO7 [pin 7] - IO8 [pin 12] - IO9 [pin 17] - RXD0 [pin 36] - TXD0 [pin 37] ### U2 — [LM5050-2](https://www.flux.ai/kicad-part-library/lm5050-2~os.md) - Manufacturer Part Number: LM5050-2 - Manufacturer Name: Texas Instruments Inc. - Package or Case Code: TSOT-23-6 - Role Details: Ideal-diode reverse polarity protection on VIN_12V - Datasheet URL: http://www.ti.com/lit/ds/symlink/lm5050-2.pdf - Role: Protection **Pins:** - ~{FGD} [pin 1] - GATE [pin 5] - GND [pin 2] - IN [pin 4] - OFF [pin 3] - OUT [pin 6] ### U3 — [LAN8740A-EN](https://www.flux.ai/jecstronic/lan8740a-en~y35.md) - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip Technology - Manufacturer Part Number: LAN8740A-EN - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/8740a.pdf **Pins:** - ~NINT~/TXER/TXD4 [pin 18] - ~NRST [pin 19] - COL/CRS_DV/MODE2 [pin 15] - CRS [pin 14] - LED1/~NINT~/~NPME~/REGOFF [pin 3] - LED2/~NINT~/~NPME~/NINTSEL [pin 2] - MDC [pin 17] - MDIO [pin 16] - RBIAS [pin 32] - RXCLK/PHYAD1 [pin 7] - RXD0/MODE0 [pin 11] - RXD1/MODE1 [pin 10] - RXD2/~NPME~/RMIISEL [pin 9] - RXD3/PHYAD2 [pin 8] - RXDV [pin 26] - RXER/RXD4/PHYAD0 [pin 13] - RXN [pin 30] - RXP [pin 31] - TXCLK [pin 20] - TXD0 [pin 22] - TXD1 [pin 23] - TXD2 [pin 24] - TXD3 [pin 25] - TXEN [pin 21] - TXN [pin 28] - TXP [pin 29] - VDD1A [pin 27] - VDD2A [pin 1] - VDDCR [pin 6] - VDDIO [pin 12] - VSS [pin 33] - XTAL1/CLKIN [pin 5] - XTAL2 [pin 4] ### U4 — [LM2596S-5.0/NOPB](https://www.flux.ai/adrian95/lm2596s-5p0nopb~ji8.md) - Manufacturer Name: Texas Instruments - Role: Power Conversion - Manufacturer Part Number: LM2596S-5.0/NOPB - Role Details: 12V to 5V Buck Converter (VBUS_5V) - Part Type: Integrated Circuit - Datasheet URL: https://www.ti.com/lit/ds/symlink/lm2596.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ON~/OFF [pin 5] - FEEDBACK [pin 4] - GND_TAB [pin 6] - GROUND [pin 3] - OUTPUT [pin 2] - VIN [pin 1] ### U5 — [SIM800C](https://www.flux.ai/vasy_skral/sim800c~emh.md) - Manufacturer Name: SIMCom - Part Type: RF Transceiver Module - Role: Cellular connectivity - Datasheet URL: https://simcom.ee/documents/SIM800C/SIM800C_Hardware_Design_V1.05.pdf - Role Details: GSM module for UART interface - Manufacturer Part Number: SIM800C **Pins:** - ~PWRKEY [pin 39] - ADC [pin 38] - BT_ANT [pin 20] - GND [pin 21] - GND [pin 36] - GND [pin 30] - GND [pin 8] - GND [pin 27] - GND [pin 19] - GND [pin 13] - GND [pin 33] - GND [pin 37] - GND [pin 31] - GSM_ANT [pin 32] - MICN [pin 10] - MICP [pin 9] - NETLIGHT [pin 41] - RF_SYNC [pin 29] - SIM_CLK [pin 16] - SIM_DATA [pin 15] - SIM_DET [pin 14] - SIM_RST [pin 17] - SIM_VDD [pin 18] - SPKN [pin 12] - SPKP [pin 11] - STATUS [pin 42] - UART1_CTS [pin 4] - UART1_DCD [pin 5] - UART1_DTR [pin 6] - UART1_RI [pin 7] - UART1_RTS [pin 3] - UART1_RXD [pin 2] - UART1_TXD [pin 1] - UART2_RXD [pin 23] - UART2_TXD [pin 22] - USB_DM [pin 26] - USB_DP [pin 25] - USB_VBUS [pin 24] - VBAT [pin 34] - VBAT [pin 35] - VDD_EXT [pin 40] - VRTC [pin 28] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/harrington40/esp32-s3-wroom-1-reference-design~i0](https://www.flux.ai/harrington40/esp32-s3-wroom-1-reference-design~i0).* --- *Generated from [https://www.flux.ai/harrington40/esp32-s3-wroom-1-reference-design~i0](https://www.flux.ai/harrington40/esp32-s3-wroom-1-reference-design~i0)*