# Heimdall Bypass ## Description Compact 4-layer automotive ESP32 Bluetooth accessory with protected 12 V input, USB-C programming/power, and a strict antenna keepout for under-seat motorcycle installation. ## Project Details - **Owner:** scorp1084 - **Created:** 8/16/2026 - **Last Updated:** 8/17/2026 - **Visibility:** Public ## Key Components ### D1 — [SMBJ33A](https://www.flux.ai/lcsc/smbj33a~g375.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010132_Shikues-SMBJ33A_C499848.pdf - Functional Group: Automotive Power - Role Details: 33 V standoff TVS, cathode to VIN_PROTECTED and anode to GND - JLCPCB Part Class: Extended Part - Manufacturer Name: SHIKUES(时科) - Product Info Url: https://lcsc.com/product-detail/TVS_Shikues-SMBJ33A_C499848.html - LCSC Part Number: C499848 - Manufacturer Part Number: SMBJ33A - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Role: Surge Protection - Part Type: TVS **Pins:** - A [pin 2] - C [pin 1] ### D10 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - Manufacturer Name: worldsemi - Manufacturer Part Number: WS2812B-Mini - Role Details: LED bar pixel 6/8, 1.9 mm height; keep diffuser band free of tall components - JLCPCB Part Class: Extended Part - Role: Signal Generation - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html - Functional Group: LED Bar - LCSC Part Number: C114583 - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - Part Type: Light Emitting Diodes (LED) **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### D11 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - Manufacturer Name: worldsemi - LCSC Part Number: C114583 - Role Details: LED bar pixel 7/8, 1.9 mm height; keep diffuser band free of tall components - Functional Group: LED Bar - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Part Type: Light Emitting Diodes (LED) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - Manufacturer Part Number: WS2812B-Mini - Role: Signal Generation - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### D12 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - LCSC Part Number: C114583 - Role: Signal Generation - Functional Group: LED Bar - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - Part Type: Light Emitting Diodes (LED) - Manufacturer Part Number: WS2812B-Mini - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html - Role Details: LED bar pixel 8/8, 1.9 mm height; final DOUT intentionally NC; keep diffuser band free of tall components - Manufacturer Name: worldsemi **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### D13 — [1N4148W-13-F](https://www.flux.ai/lcsc/1n4148w-13-f~5cuh.md) - JLCPCB Part Class: Extended Part - Part Type: Switching Diode - Role Details: AP63203 EN diode-OR: automotive 5 V enables immediately; USB-only path waits for CP2102N SUSPENDb deassertion - LCSC Part Number: C112342 - Functional Group: 3V3 Power - Role: Rectification - Manufacturer Part Number: 1N4148W-13-F - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-1N4148W-13-F_C112342.pdf - Product Info Url: https://lcsc.com/product-detail/Switching-Diode_DIODES_1N4148W-13-F_1N4148W-13-F_C112342.html - Package or Case Code: SOD-123_L2.7-W1.6-LS3.7-RD - Manufacturer Name: DIODES(美台) **Pins:** - 1 [pin 1] - 2 [pin 2] ### D14 — [1N4148W-13-F](https://www.flux.ai/lcsc/1n4148w-13-f~5cuh.md) - Product Info Url: https://lcsc.com/product-detail/Switching-Diode_DIODES_1N4148W-13-F_1N4148W-13-F_C112342.html - Role: Rectification - Package or Case Code: SOD-123_L2.7-W1.6-LS3.7-RD - Manufacturer Name: DIODES(美台) - Functional Group: 3V3 Power - Manufacturer Part Number: 1N4148W-13-F - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-1N4148W-13-F_C112342.pdf - Part Type: Switching Diode - Role Details: AP63203 EN diode-OR: automotive 5 V enables immediately; USB-only path waits for CP2102N SUSPENDb deassertion - LCSC Part Number: C112342 - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### D2 — [USBLC6-2SC6](https://www.flux.ai/vasy_skral/usblc6-2sc6~g1b.md) - Functional Group: USB and Programming - Part Type: Protection - License: https://creativecommons.org/licenses/by/4.0/ - Role: ESD Protection - Manufacturer Part Number: USBLC6-2SC6 - 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 - Manufacturer Name: STMicroelectronics - LCSC Part Number: C7519 - Symbol Style: parametric-v1 - Role Details: USB 2.0 D+/D- low-capacitance protection array **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D3 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - Functional Group: Status Indicator - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - Part Type: Light Emitting Diodes (LED) - LCSC Part Number: C114583 - Role Details: LED bar pixel 1/8, 1.9 mm height; GPIO25 via U8/R13; reserve diffuser band around D3,D6-D12 with no tall components - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html - Manufacturer Part Number: WS2812B-Mini - Role: Status LED - Manufacturer Name: worldsemi **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### D5 — [BZT52C12-7-F](https://www.flux.ai/lcsc/bzt52c12-7-f~p7ye.md) - Manufacturer Name: DIODES(美台) - Functional Group: Automotive Power - Manufacturer Part Number: BZT52C12-7-F - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/e61ab987678771beec3696d1c7c275077dbd85f43b0d1d018c1cb2a70c76f48f.pdf - Product Info Url: https://lcsc.com/product-detail/Zener-Diodes_DIODES_BZT52C12-7-F_BZT52C12-7-F_C124196.html - Role Details: 12 V zener from Q1 gate to source prevents exceeding ±20 V VGS - JLCPCB Part Class: Extended Part - Role: Gate Protection - LCSC Part Number: C124196 - Package or Case Code: SOD-123_L2.7-W1.6-LS3.7-RD - Part Type: Zener Diodes **Pins:** - A [pin 2] - C [pin 1] ### D6 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - Role: Signal Generation - Functional Group: LED Bar - Manufacturer Name: worldsemi - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Part Type: Light Emitting Diodes (LED) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - LCSC Part Number: C114583 - Role Details: LED bar pixel 2/8, 1.9 mm height; keep diffuser band free of tall components - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html - Manufacturer Part Number: WS2812B-Mini **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### D7 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - LCSC Part Number: C114583 - Role: Signal Generation - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - Part Type: Light Emitting Diodes (LED) - Manufacturer Part Number: WS2812B-Mini - Role Details: LED bar pixel 3/8, 1.9 mm height; keep diffuser band free of tall components - Functional Group: LED Bar - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html - Manufacturer Name: worldsemi **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### D8 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - Role: Signal Generation - LCSC Part Number: C114583 - Functional Group: LED Bar - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - Part Type: Light Emitting Diodes (LED) - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Manufacturer Part Number: WS2812B-Mini - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html - JLCPCB Part Class: Extended Part - Role Details: LED bar pixel 4/8, 1.9 mm height; keep diffuser band free of tall components - Manufacturer Name: worldsemi **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### D9 — [WS2812B-Mini](https://www.flux.ai/lcsc/ws2812b-mini~mucn.md) - Manufacturer Name: worldsemi - Role: Signal Generation - Functional Group: LED Bar - Role Details: LED bar pixel 5/8, 1.9 mm height; keep diffuser band free of tall components - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_3535-RGBIntegrated-Light_C114583.html - Manufacturer Part Number: WS2812B-Mini - Package or Case Code: LED-SMD_4P-L3.5-W3.5-TL_WS2812B - Part Type: Light Emitting Diodes (LED) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Worldsemi-WS2812B-Mini_C114583.pdf - LCSC Part Number: C114583 **Pins:** - DIN [pin 4] - DOUT [pin 2] - VDD [pin 1] - VSS [pin 3] ### F1 — [60MR-A](https://www.flux.ai/lcsc/60mr-a~j7ce.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912171433_Littelfuse-2920L110-60MR-A_C468892.pdf - JLCPCB Part Class: Extended Part - Functional Group: Automotive Power - Product Info Url: https://lcsc.com/product-detail/PTC-Resettable-Fuses_Littelfuse-2920L110-60MR-A_C468892.html - Role: Protection - Role Details: 2920L110/60MR-A, 1.1 A hold and 60 V; normal 12 V full-load input about 0.41 A, brief 6 V crank estimate about 0.88 A; validate hot derating - LCSC Part Number: C468892 - Manufacturer Name: Littelfuse(美国力特) - Manufacturer Part Number: 2920L110/60MR-A - Package or Case Code: F2920 - Part Type: Resettable Fuses **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [0436500200](https://www.flux.ai/adrian95/0436500200~dp5.md) - Part Type: Connectors - Role: Power Conversion - Manufacturer Part Number: 43650-0200 - Functional Group: Automotive Power - Datasheet URL: https://www.molex.com/pdm_docs/sd/436500200_sd.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Mount: PCB - Manufacturer Name: Molex - Role Details: Molex 43650-0200 / 0436500200 Micro-Fit 3.0, right-angle THT, snap-in PCB lock and positive-latch mating family; verified 5.57 mm board-side envelope; pin 1 +12V_SW, pin 2 GND **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [USB-C 2.0 Receptacle](https://www.flux.ai/vasy_skral/usb-c-2p0-receptacle~1xw.md) - Functional Group: USB and Programming - Symbol Style: parametric-v1 - Datasheet URL: https://gct.co/files/drawings/usb4105.pdf - Part Type: USB C - Role Details: USB4105-GF-A USB-C 2.0 sink/device receptacle; SMT contacts with through-hole shell stakes, independent CC resistors; 3.31 mm body height above PCB - Manufacturer Name: GTC - Role: USB Connector - Manufacturer Part Number: USB4105-GF-A - Purchase Url: https://www.digikey.com/en/products/detail/gct/USB4105-GF-A/11198441 **Pins:** - CC1 [pin 6] - CC2 [pin 12] - D- [pin 7] - D- [pin 9] - D+ [pin 10] - D+ [pin 8] - GND [pin 1] - GND [pin 16] - GND [pin 15] - GND [pin 2] - SBU1 [pin 11] - SBU2 [pin 5] - VBUS [pin 3] - VBUS [pin 14] - VBUS [pin 4] - VBUS [pin 13] ### Q1 — [DMP6023LFG-7](https://www.flux.ai/lcsc/dmp6023lfg-7~nwpp.md) - Manufacturer Part Number: DMP6023LFG-7 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-DMP6023LFG-7_C526579.pdf - Functional Group: Automotive Power - Role: Reverse Polarity Protection - LCSC Part Number: C526579 - Package or Case Code: POWERDI3333-8_L3.3-W3.3-P0.65-BL - Role Details: AEC-Q101 DMP6023LFG-7 P-channel MOSFET, -60 V, 25 mOhm max at -10 V; POWERDI3333-8 height 0.85 mm max; 12 V gate-source zener clamp - Part Type: MOSFETs - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/MOSFET_Diodes-Incorporated-DMP6023LFG-7_C526579.html - Manufacturer Name: DIODES(美台) **Pins:** - D [pin 5] - G [pin 4] - S [pin 2] - S [pin 1] - S [pin 3] ### Q2 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g~s5.md) - Role: Auto Reset Transistor - Part Type: Transistor - Manufacturer Name: onsemi - Functional Group: Auto Reset - Manufacturer Part Number: MMBT3904LT1G - Role Details: DTR/RTS translation for ESP32 EN/GPIO0 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q3 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g~s5.md) - Manufacturer Part Number: MMBT3904LT1G - Manufacturer Name: onsemi - Role Details: DTR/RTS translation for ESP32 EN/GPIO0 - Functional Group: Auto Reset - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf - Role: Auto Reset Transistor - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### S1 — [434153017835](https://www.flux.ai/silicon-yard/434153017835.md) - Part Type: Switch - Role: Boot Switch - Manufacturer Part Number: 434153017835 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/a84c85dacf9aa62769303b09754c3b1c77674964659bf458883e051fe6023739.pdf - Role Details: Momentary normally-open GPIO0-to-GND boot control - Functional Group: MCU Core - Manufacturer Name: Würth **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### TP1 — [TestPoint_Pad_1.0x1.0mm](https://www.flux.ai/adrian95/testpointpad10x10mm~77t.md) - Part Type: Connector - Role: Test Point - Functional Group: Test Points - Role Details: 3V3 rail test pad - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] ### TP2 — [TestPoint_Pad_1.0x1.0mm](https://www.flux.ai/adrian95/testpointpad10x10mm~77t.md) - Functional Group: Test Points - Part Type: Connector - Role Details: Ground test pad - License: https://creativecommons.org/licenses/by/4.0/ - Role: Test Point **Pins:** - 1 [pin 1] ### TP3 — [TestPoint_Pad_1.0x1.0mm](https://www.flux.ai/adrian95/testpointpad10x10mm~77t.md) - Functional Group: Test Points - Part Type: Connector - Role Details: ESP32 EN test pad - Role: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] ### TP4 — [TestPoint_Pad_1.0x1.0mm](https://www.flux.ai/adrian95/testpointpad10x10mm~77t.md) - Part Type: Connector - Functional Group: Test Points - Role Details: ESP32 GPIO0 boot test pad - Role: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] ### TP5 — [TestPoint_Pad_1.0x1.0mm](https://www.flux.ai/adrian95/testpointpad10x10mm~77t.md) - Role Details: ESP32 TXD0 test pad - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: Test Points - Role: Test Point **Pins:** - 1 [pin 1] ### TP6 — [TestPoint_Pad_1.0x1.0mm](https://www.flux.ai/adrian95/testpointpad10x10mm~77t.md) - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: Test Points - Role Details: ESP32 RXD0 test pad - Role: Test Point - Part Type: Connector **Pins:** - 1 [pin 1] ### U1 — [ESP32-WROOM-32E-N4](https://www.flux.ai/lcsc/esp32-wroom-32e-n4~cokv.md) - Operating Temperature: –40 ~ 85 °C - JLCPCB Part Class: Extended Part - Frequency: 2412 ~ 2484 MHz - Manufacturer Part Number: ESP32-WROOM-32E-N4 - Role: Wireless MCU - Product Info Url: https://lcsc.com/product-detail/WIFI-Modules_Espressif-Systems-ESP32-WROOM-32E-4MB_C701341.html - Role Details: Main ESP32 controller; WROOM-32E/32UE pad-compatible footprint; GPIO25 drives LED bar; module height 3.25 mm max (3.1 +/-0.15 mm) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410301607_Espressif-Systems-ESP32-WROOM-32E-N4_C701341.pdf - Operating Voltage: 3.0 ~ 3.6 V - LCSC Part Number: C701341 - Functional Group: MCU Core - Part Type: WiFi Modules - Manufacturer Name: ESPRESSIF(乐鑫) - Package or Case Code: WIFI-SMD_ESP32-WROOM-32E **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 38] - GND [pin 15] - GND [pin 39] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 17] - NC [pin 32] - NC [pin 19] - NC [pin 21] - NC [pin 20] - NC [pin 22] - NC [pin 18] - RXD0 [pin 34] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - TXD0 [pin 35] ### U2 — [LM65645SRZTRQ1](https://www.flux.ai/silicon-yard/lm65645srztrq1.md) - Symbol Style: parametric-v1 - Functional Group: Automotive Power - Role Details: Automotive VIN_PROTECTED to AUTO_5V; fixed 5 V via FB-to-VCC, 2.2 MHz, 1.5 uH and >=25 uF effective output; approximately 0.9 A system load - Package or Case Code: 20-WFQFN Exposed Pad - Manufacturer Part Number: LM65645SRZTRQ1 - Manufacturer Name: Texas Instruments - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/66a5596410ea65e697b50148afbb994976ab01079629c675a073b9d02c373bf6.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Power Management - Role: Buck Regulator **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] ### U3 — [CP2102N-A02-GQFN28](https://www.flux.ai/jecstronic/cp2102n-a02-gqfn28~mvt.md) - Manufacturer Part Number: CP2102N-A02-GQFN28 - Role Details: USB-powered CP2102N bridge; configure Bus-Powered Max Power for intended USB-only load; SUSPENDb enables U4 after enumeration - Role: USB-UART Bridge - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://componentsearchengine.com/Datasheets/2/CP2102N-A02-GQFN28.pdf - Manufacturer Name: Silicon Labs - Part Type: Integrated Circuit - Functional Group: USB and Programming **Pins:** - BGND [pin 29] - CHR0 [pin 15] - CHR1 [pin 14] - CHREN [pin 13] - CTS [pin 23] - D- [pin 5] - D+ [pin 4] - DCD [pin 1] - DSR [pin 27] - DTR [pin 28] - GND [pin 3] - GPIO.0/TXT [pin 19] - GPIO.1/RXT [pin 18] - GPIO.2/RS485 [pin 17] - GPIO.3/WAKEUP [pin 16] - GPIO.4 [pin 22] - GPIO.5 [pin 21] - GPIO.6 [pin 20] - NC [pin 10] - RI/CLK [pin 2] - RSTB [pin 9] - RTS [pin 24] - RXD [pin 25] - SUSPEND [pin 12] - SUSPENDB [pin 11] - TXD [pin 26] - VBUS [pin 8] - VDD [pin 6] - VREGIN [pin 7] ### U4 — [AP63203WU-7](https://www.flux.ai/adrian95/ap63203wu-7~o8a.md) - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP63200-AP63201-AP63203-AP63205.pdf - Manufacturer Name: Diodes Incorporated - Role Details: Common 5 V to 3.3 V, 2 A buck; supports ESP32 500 mA peaks plus logic margin; 3.9 uH, 10 uF input and 2x22 uF output per datasheet - Manufacturer Part Number: AP63203WU-7 - Functional Group: USB Power - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: parametric-v1 - Role: Power Conversion **Pins:** - BST [pin 6] - EN [pin 2] - FB [pin 1] - GND [pin 4] - SW [pin 5] - VIN [pin 3] ### U5 — [LM66100DCKR](https://www.flux.ai/lcsc/lm66100dckr~n7rd.md) - Manufacturer Part Number: LM66100DCKR - Symbol Style: parametric-v1 - Functional Group: Power ORing - Role Details: LM66100 ideal diode from AUTO_5V to common 5V; 1.5 A rated, CE tied to VOUT for reverse-current blocking - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/073d95fd957eb97860bc1955e3d8437c849217e594930e2542a315ec77cc0da2.pdf - Role: Ideal Diode - LCSC Part Number: C2869734 - Part Type: Integrated Circuit - Manufacturer Name: TI(德州仪器) - Package or Case Code: SC-70-6_L2.0-W1.3-P0.65-LS2.1-BL - JLCPCB Part Class: Extended Part **Pins:** - ~{CE} [pin 3] - GND [pin 2] - NC [pin 4] - ST [pin 5] - VIN [pin 1] - VOUT [pin 6] ### U6 — [LM66100DCKR](https://www.flux.ai/lcsc/lm66100dckr~n7rd.md) - Symbol Style: parametric-v1 - Role: Ideal Diode - Manufacturer Part Number: LM66100DCKR - Functional Group: Power ORing - LCSC Part Number: C2869734 - Role Details: LM66100 ideal diode from USB_VBUS to common 5V; 1.5 A rated, CE tied to VOUT for reverse-current blocking; USB source current is not assumed unlimited - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/073d95fd957eb97860bc1955e3d8437c849217e594930e2542a315ec77cc0da2.pdf - Part Type: Integrated Circuit - Package or Case Code: SC-70-6_L2.0-W1.3-P0.65-LS2.1-BL - Manufacturer Name: TI(德州仪器) - JLCPCB Part Class: Extended Part **Pins:** - ~{CE} [pin 3] - GND [pin 2] - NC [pin 4] - ST [pin 5] - VIN [pin 1] - VOUT [pin 6] ### U8 — [74AHCT1G125W5-7](https://www.flux.ai/lcsc/74ahct1g125w5-7~t6h6.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: DIODES(美台) - Role Details: AHCT buffer powered from LED_5V; 2.0 V VIH accepts ESP32 3.3 V output - LCSC Part Number: C842287 - Role: Logic Level Shifter - Part Type: Buffers / Drivers - Manufacturer Part Number: 74AHCT1G125W5-7 - Functional Group: Status Indicator - Symbol Style: parametric-v1 - Package or Case Code: SOT-25-5_L3.0-W1.6-P0.95-LS2.8-BL - Datasheet URL: https://www.lcsc.com/datasheet/C842287.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VbVlZfRVhaVzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - JLCPCB Part Class: Extended Part **Pins:** - ~{OE} [pin 1] - A [pin 2] - GND [pin 3] - Vcc [pin 5] - Y [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/scorp1084/heimdall-bypass~7u](https://www.flux.ai/scorp1084/heimdall-bypass~7u).* --- *Generated from [https://www.flux.ai/scorp1084/heimdall-bypass~7u](https://www.flux.ai/scorp1084/heimdall-bypass~7u)*