# Li\-Stick

## Description

Li\-Stick ESP32\-S3\-WROOM\-1\-N8R8 core/control schematic with native USB programming, boot/reset support, debug/test access, and reserved system interfaces\. Current scope intentionally excludes all power conversion, sensors, audio, AI, LTE, and PCB layout\.

## Project Details

- **Owner:** marc\-salameh
- **Created:** 8/12/2026
- **Last Updated:** 8/24/2026
- **Visibility:** Public

## Key Components

### D1 — [USBLC6\-2SC6](https://flux.ai/vasy_skral/usblc6-2sc6~g1b.md)

- Manufacturer Part Number: USBLC6\-2SC6
- Symbol Style: parametric\-v1
- Functional Group: Native USB Service
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Protection
- Manufacturer Name: STMicroelectronics
- 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
- Role Details: USB 2\.0 D\+/D\- ESD array located logically between connector and MCU
- LCSC Part Number: C7519
- Role: Protection

**Pins:**
- GND [pin 2]
- I/O1 [pin 6]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O2 [pin 4]
- VBUS [pin 5]

### J1 — [0473460001](https://flux.ai/adrian95/0473460001~d9a.md)

- Role Details: Native USB service connector; data and ground only in this scoped block
- Manufacturer Name: Molex
- Functional Group: Native USB Service
- Role: Protection
- Manufacturer Part Number: 0473460001
- Datasheet URL: https://tools\.molex\.com/pdm\_docs/sd/473460001\_sd\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Connector
- Symbol Style: parametric\-v1

**Pins:**
- D\- [pin 2]
- D\+ [pin 3]
- GND [pin 5]
- ID [pin 4]
- SHIELD [pin S6]
- SHIELD [pin S5]
- SHIELD [pin S2]
- SHIELD [pin S4]
- SHIELD [pin S3]
- SHIELD [pin S1]
- VBUS [pin 1]

### SW1 — [B3FS\-1002P](https://flux.ai/adrian95/b3fs-1002p.md)

- Role: Switching
- Datasheet URL: https://omronfs\.omron\.com/en\_US/ecb/products/pdf/en\-b3fs\.pdf
- Role Details: Manual RESET/EN pushbutton to ground
- Part Type: Electromechanical Components
- Manufacturer Name: Omron Electronics Inc\-EMC Div
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: Reset and Boot
- Manufacturer Part Number: B3FS\-1002P

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### SW2 — [B3FS\-1002P](https://flux.ai/adrian95/b3fs-1002p.md)

- Datasheet URL: https://omronfs\.omron\.com/en\_US/ecb/products/pdf/en\-b3fs\.pdf
- Functional Group: Reset and Boot
- Role Details: Manual BOOT pushbutton; GPIO0 has no other functional loading
- Part Type: Electromechanical Components
- Manufacturer Name: Omron Electronics Inc\-EMC Div
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: B3FS\-1002P
- Role: Switching

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### TP1 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: Manufacturing Test
- Part Type: Test point
- Role Details: 3V3 rail test access
- Role: Sensing \(Shunt\)
- Manufacturer Part Number: S1751\-46R

**Pins:**
- P1 [pin 1]

### TP2 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- Functional Group: Manufacturing Test
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Test point
- Role: Sensing \(Shunt\)
- Manufacturer Part Number: S1751\-46R
- Role Details: Ground reference test access

**Pins:**
- P1 [pin 1]

### TP3 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- Functional Group: Manufacturing Test
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Test point
- Role: Sensing \(Shunt\)
- Manufacturer Part Number: S1751\-46R
- Role Details: EN reset test access

**Pins:**
- P1 [pin 1]

### TP4 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- Role Details: GPIO0 boot strap test access
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Test point
- Functional Group: Manufacturing Test
- Manufacturer Part Number: S1751\-46R
- Role: Sensing \(Shunt\)

**Pins:**
- P1 [pin 1]

### TP5 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Test point
- Functional Group: Manufacturing Test
- Role: Sensing \(Shunt\)
- Manufacturer Part Number: S1751\-46R
- Role Details: Native USB D\- test access on MCU side of protection

**Pins:**
- P1 [pin 1]

### TP6 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- Role: Sensing \(Shunt\)
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: Manufacturing Test
- Part Type: Test point
- Role Details: Native USB D\+ test access on MCU side of protection
- Manufacturer Part Number: S1751\-46R

**Pins:**
- P1 [pin 1]

### TP7 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Test point
- Functional Group: UART Debug
- Role Details: UART0 TX output after 499 ohm series resistor
- Manufacturer Part Number: S1751\-46R
- Role: Sensing \(Shunt\)

**Pins:**
- P1 [pin 1]

### TP8 — [S1751\-46R](https://flux.ai/adrian95/s1751-46r~7b.md)

- Manufacturer Name: Harwin Inc\.
- Datasheet URL: https://content\.harwin\.com/m/c5b84e6a45e9b9f6/original/DRG\-02202\-Technical\-Drawing\-Datasheet\-S1751R\-pdf\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: UART0 RX input test access
- Part Type: Test point
- Role: Sensing \(Shunt\)
- Manufacturer Part Number: S1751\-46R
- Functional Group: UART Debug

**Pins:**
- P1 [pin 1]

### U1 — [ESP32\-S3\-WROOM\-1\-N8R8](https://flux.ai/lcsc/esp32-s3-wroom-1-n8r8~law5.md)

- JLCPCB Part Class: Extended Part
- Package or Case Code: WIRELM\-SMD\_ESP32\-S3\-WROOM\-1
- Operating Temperature: \-40°C \~ 65°C \(TA\)
- Role Details: Li\-Stick production MCU; GPIO19/20 dedicated to native USB; GPIO35\-37 reserved by internal octal PSRAM
- Manufacturer Name: ESPRESSIF\(乐鑫\)
- Functional Group: MCU Core
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Module
- Frequency: 2\.4GHz
- LCSC Part Number: C2913201
- Role: Main Controller
- Manufacturer Part Number: ESP32\-S3\-WROOM\-1\-N8R8
- Current \- Receiving: 97mA \~ 100mA
- Voltage Supply: 3V \~ 3\.6V
- Current \- Transmitting: 273mA \~ 330mA
- Symbol Style: parametric\-v1
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2913201\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VWXlNTRlJdUTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D

**Pins:**
- 3V3 [pin 2]
- EN [pin 3]
- GND [pin 41\_6]
- GND [pin 41\_1]
- GND [pin 41\_4]
- GND [pin 41\_9]
- GND [pin 40]
- GND [pin 41\_2]
- GND [pin 41\_7]
- GND [pin 41\_3]
- GND [pin 41\_5]
- GND [pin 1]
- GND [pin 41\_8]
- 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]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/marc\-salameh/li\-stick\~oy](https://flux.ai/marc-salameh/li-stick~oy).*

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*Generated from [https://flux\.ai/marc\-salameh/li\-stick\~oy](https://flux.ai/marc-salameh/li-stick~oy)*