# USB\-C WiFi BLE TH Sensor

## Description

Consumer USB\-C powered environmental sensor node with Wi\-Fi, BLE 5\.x, digital temperature/humidity sensing, protected 5 V input, and a 3\.3 V low\-power MCU/sensor rail\.

## Project Details

- **Owner:** jayjh
- **Created:** 7/21/2026
- **Last Updated:** 7/22/2026
- **Visibility:** Public
- **Connectivity:** WiFi
- **Power Requirements:** USB\-C
- **Domain:** Consumer IoT
- **Operating Voltage:** 5V
- **Connectivity:** Bluetooth

## Key Components

### D1 — [USBLC6\-2SC6](https://flux.ai/lcsc/usblc6-2sc6~2e9x.md)

- JLCPCB Part Class: Extended Part
- Manufacturer Name: UMW\(友台半导体\)
- Symbol Style: parametric\-v1
- Breakdown Voltage: 6V
- Manufacturer Part Number: USBLC6\-2SC6
- Operating Temperature: \-55°C \~ 125°C \(TJ\)
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2687116\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhdUVdURFlXXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Maximum Clamping Voltage: 17V
- Role: ESD Protection
- Part Type: ESD Protection Devices
- Role Details: USB 2\.0 data\-line ESD array near USB\-C connector
- Package or Case Code: SOT\-23\-6\_L2\.9\-W1\.6\-P0\.95\-LS2\.8\-BL
- Peak Pulse Current: 5A
- Power: 150W
- LCSC Part Number: C2687116

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

### D2 — [ESD5341N](https://flux.ai/lcsc/esd5341n~k8iz.md)

- Forward Voltage: 0\.7V at 1AV
- Datasheet URL: https://www\.lcsc\.com/datasheet/C3021106\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VbVVxRR1JXUTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Manufacturer Name: TECH PUBLIC\(台舟\)
- Diode Type: TVS Diode
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C3021106
- Manufacturer Part Number: ESD5341N
- Package or Case Code: DFN1006\-2L\-RD
- Part Type: TVS
- Role Details: 5 V VBUS TVS/ESD clamp at connector before eFuse
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: ESD Protection
- Max Reverse Voltage: 5V

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

### D3 — [ESD5341N](https://flux.ai/lcsc/esd5341n~k8iz.md)

- Forward Voltage: 0\.7V at 1AV
- Datasheet URL: https://www\.lcsc\.com/datasheet/C3021106\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VbVVxRR1JXUTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Manufacturer Name: TECH PUBLIC\(台舟\)
- Diode Type: TVS Diode
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C3021106
- Role Details: USB\-C CC1 5 V ESD clamp near connector
- Manufacturer Part Number: ESD5341N
- Package or Case Code: DFN1006\-2L\-RD
- Part Type: TVS
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Protection
- Max Reverse Voltage: 5V

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

### D4 — [ESD5341N](https://flux.ai/lcsc/esd5341n~k8iz.md)

- Forward Voltage: 0\.7V at 1AV
- Datasheet URL: https://www\.lcsc\.com/datasheet/C3021106\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VbVVxRR1JXUTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Manufacturer Name: TECH PUBLIC\(台舟\)
- Diode Type: TVS Diode
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C3021106
- Manufacturer Part Number: ESD5341N
- Package or Case Code: DFN1006\-2L\-RD
- Part Type: TVS
- Role Details: USB\-C CC2 5 V ESD clamp near connector
- License: https://creativecommons\.org/licenses/by/4\.0/
- Max Reverse Voltage: 5V
- Role: Protection

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

### J1 — [USB4105\-GF\-A](https://flux.ai/adrian95/usb4105-gf-a~im9.md)

- Part Type: USB C
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: 5 V sink\-only input, CC1/CC2 Rd resistors, VBUS power path
- Symbol Style: parametric\-v1
- Role: USB\-C Connector
- Manufacturer Name: GCT
- Manufacturer Name: GCT
- Datasheet URL: https://gct\.co/files/specs/usb4105\-spec\.pdf
- Manufacturer Part Number: USB4105\-GF\-A

**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- DN1 [pin A7]
- DN2 [pin B7]
- DP1 [pin A6]
- DP2 [pin B6]
- GND [pin A1\_B12]
- GND\_\_1 [pin B1\_A12]
- SBU1 [pin A8]
- SBU2 [pin B8]
- SHELL\_GND [pin SH1]
- SHELL\_GND\_\_1 [pin SH2]
- SHELL\_GND\_\_2 [pin SH3]
- SHELL\_GND\_\_3 [pin SH4]
- VBUS [pin A4\_B9]
- VBUS\_\_1 [pin B4\_A9]

### J2 — [M50\-3500542](https://flux.ai/adrian95/m50-3500542~4sb.md)

- Part Type: Connectors
- Manufacturer Name: Harwin
- Datasheet URL: https://content\.harwin\.com/m/d0f746354cedd7a4/original/PD002\-Product\-Datasheet\-ARCHER\-M50\-and\-M52\-ranges\-BBi\.pdf
- Role: Debug Header
- Role Details: SWD/JTAG, UART ISP, reset, 3\.3 V reference, and ground access
- Mount: Through Hole
- Manufacturer Part Number: M50\-3500542
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- 1 [pin 1]
- 10 [pin 10]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]
- 7 [pin 7]
- 8 [pin 8]
- 9 [pin 9]

### LED1 — [P0603P1N46G12](https://flux.ai/rohit297/p0603p1n46g12~4e.md)

- Package or Case Code: D\_0603\_1608Metric
- Forward Voltage: 2V
- Manufacturer Name: Silverlight
- Manufacturer Part Number: P0603P1N46G12
- Part Type: LED
- Role Details: MCU\-controlled low\-current status LED
- Datasheet URL: https://wmsc\.lcsc\.com/wmsc/upload/file/pdf/v2/lcsc/2208181800\_Silverlight\-P0603P1N46G12\_C5123548\.pdf
- Role: Status Indicator

**Pins:**
- A [pin 2]
- K [pin 1]

### SW1 — [FSM1LP](https://flux.ai/adrian95/fsm1lp.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: TE Connectivity
- Role Details: Manual reset by pulling SiWG917 POC\_IN low
- Part Type: Electromechanical Components
- Datasheet URL: https://www\.te\.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog\+Section%7F1308111\-1\_SWITCHES\_CORE\_PROGRAM\_CATALOG%7F0308%7Fpdf%7FEnglish%7FENG\_CS\_1308111\-1\_SWITCHES\_CORE\_PROGRAM\_CATALOG\_0308\.pdf%7F1\-1437565\-6
- Manufacturer Part Number: FSM1LP
- Role: Reset Switch

**Pins:**
- COM\_1 [pin 1]
- COM\_2 [pin 2]
- GND [pin 5]
- NO\_1 [pin 3]
- NO\_2 [pin 4]

### SW2 — [FSM1LP](https://flux.ai/adrian95/fsm1lp.md)

- Role: Boot/ISP Switch
- Role Details: Pulls JTAG\_TDO\_SWO low to request ISP bootloader mode
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: TE Connectivity
- Part Type: Electromechanical Components
- Datasheet URL: https://www\.te\.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog\+Section%7F1308111\-1\_SWITCHES\_CORE\_PROGRAM\_CATALOG%7F0308%7Fpdf%7FEnglish%7FENG\_CS\_1308111\-1\_SWITCHES\_CORE\_PROGRAM\_CATALOG\_0308\.pdf%7F1\-1437565\-6
- Manufacturer Part Number: FSM1LP

**Pins:**
- COM\_1 [pin 1]
- COM\_2 [pin 2]
- GND [pin 5]
- NO\_1 [pin 3]
- NO\_2 [pin 4]

### U1 — [SIWG917Y111MGABAR](https://flux.ai/adrian95/siwg917y111mgabar.md)

- Role: Wireless MCU module
- Part Type: Module
- Role Details: Low\-power Wi\-Fi/BLE sensor controller; 3\.3 V supplies; integrated antenna requires edge keepout
- Manufacturer Part Number: SIWG917Y111MGABAR
- Manufacturer Name: Silicon Labs
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/a304d5e8e6e437830e39c060dfff2feb9d6bc31b2834f45b43e373b5288d7fa0\.pdf
- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Package or Case Code: Module

**Pins:**
- 1V8\_LDO [pin 36]
- ANT\_TUNE\_1 [pin 1]
- ANT\_TUNE\_2 [pin 61]
- FLASH\_IO\_VDD [pin 54]
- GND\_1 [pin 2]
- GND\_10 [pin 65]
- GND\_11 [pin 66]
- GND\_12 [pin 67]
- GND\_13 [pin 68]
- GND\_14 [pin 69]
- GND\_15 [pin 70]
- GND\_16 [pin 71]
- GND\_2 [pin 3]
- GND\_3 [pin 9]
- GND\_4 [pin 11]
- GND\_5 [pin 57]
- GND\_6 [pin 60]
- GND\_7 [pin 62]
- GND\_8 [pin 63]
- GND\_9 [pin 64]
- GPIO\_10 [pin 55]
- GPIO\_11 [pin 58]
- GPIO\_12 [pin 56]
- GPIO\_15 [pin 59]
- GPIO\_25 [pin 49]
- GPIO\_26 [pin 53]
- GPIO\_27 [pin 46]
- GPIO\_28 [pin 48]
- GPIO\_29 [pin 47]
- GPIO\_30 [pin 45]
- GPIO\_46 [pin 44]
- GPIO\_47 [pin 40]
- GPIO\_48 [pin 39]
- GPIO\_49 [pin 41]
- GPIO\_50 [pin 42]
- GPIO\_51 [pin 43]
- GPIO\_52 [pin 25]
- GPIO\_53 [pin 18]
- GPIO\_54 [pin 19]
- GPIO\_55 [pin 12]
- GPIO\_56 [pin 17]
- GPIO\_57 [pin 21]
- GPIO\_6 [pin 24]
- GPIO\_7 [pin 38]
- GPIO\_8 [pin 20]
- GPIO\_9 [pin 22]
- IOVDD [pin 50]
- JTAG\_TCK\_SWCLK [pin 15]
- JTAG\_TDI [pin 16]
- JTAG\_TDO\_SWO [pin 14]
- JTAG\_TMS\_SWDIO [pin 13]
- POC\_IN [pin 31]
- POC\_OUT [pin 32]
- RESET\_N [pin 33]
- RF [pin 10]
- SDIO\_IO\_VDD [pin 52]
- ULP\_GPIO\_0 [pin 35]
- ULP\_GPIO\_1 [pin 28]
- ULP\_GPIO\_11 [pin 5]
- ULP\_GPIO\_2 [pin 51]
- ULP\_GPIO\_4 [pin 8]
- ULP\_GPIO\_5 [pin 6]
- ULP\_GPIO\_6 [pin 23]
- ULP\_GPIO\_7 [pin 7]
- ULP\_GPIO\_8 [pin 37]
- ULP\_GPIO\_9 [pin 27]
- ULP\_IO\_VDD [pin 26]
- UULP\_VBAT\_GPIO\_0 [pin 4]
- UULP\_VBAT\_GPIO\_2 [pin 30]
- UULP\_VBAT\_GPIO\_3 [pin 29]
- VBATT [pin 34]

### U2 — [TPS25940LRVCR](https://flux.ai/adrian95/tps25940lrvcr~ojd.md)

- Symbol Style: parametric\-v1
- Role: Protection
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/tps25940\.pdf
- Manufacturer Name: Texas Instruments
- Manufacturer Part Number: TPS25940LRVCR
- Part Type: Integrated Circuit
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: USB\-C VBUS eFuse; true reverse current blocking; \~1 A current limit; UVLO \~4\.3 V, OVP \~6\.0 V

**Pins:**
- \~FLT [pin 20]
- DEVSLP [pin 1]
- DVDT [pin 18]
- EN [pin 14]
- EP [pin 21]
- GND [pin 16]
- ILIM [pin 17]
- IMON [pin 19]
- IN\_1 [pin 9]
- IN\_2 [pin 10]
- IN\_3 [pin 11]
- IN\_4 [pin 12]
- IN\_5 [pin 13]
- OUT\_1 [pin 4]
- OUT\_2 [pin 5]
- OUT\_3 [pin 6]
- OUT\_4 [pin 7]
- OUT\_5 [pin 8]
- OVP [pin 15]
- PGOOD [pin 2]
- PGTH [pin 3]

### U3 — [MP28301GG\-Z](https://flux.ai/monolithicpower/mp28301gg-z~ths.md)

- Product Image Url: https://www\.monolithicpower\.com/pub/media/catalog/product/m/p/mp28301\_tac\.jpg
- Package or Case Code: QFN\-2x2\_MP28301\_MNP
- Manufacturer Part Number: MP28301GG\-Z
- Manufacturer Name: Monolithic Power Systems
- Role Details: 700 mA 3\.3 V buck output selected to avoid LDO heat near temperature sensor
- Role: Buck Regulator
- Product Info Url: https://www\.monolithicpower\.com/en/catalog/product/view/id/2983?utm\_source=ultralibrarian&utm\_medium=component\_search&utm\_campaign=listing
- Datasheet URL: https://www\.monolithicpower\.com/en/documentview/productdocument/index/version/2/document\_type/Datasheet/lang/en/sku/MP28301

**Pins:**
- CTRL1 [pin 2]
- CTRL2 [pin 3]
- CTRL3 [pin 4]
- CTRL4 [pin 5]
- CTRL5 [pin 6]
- GND [pin 8]
- OUT1 [pin 1]
- OUT2 [pin 12]
- PG1 [pin 7]
- SW [pin 9]
- VIN1 [pin 10]
- VIN2 [pin 11]

### U4 — [SHT41\-AD1B\-R2](https://flux.ai/adrian95/sht41-ad1b-r2.md)

- Part Type: Sensors
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: SHT41\-AD1B\-R2
- Role: Temperature/Humidity Sensor
- Datasheet URL: https://sensirion\.com/media/documents/33FD6951/67EB9032/HT\_DS\_Datasheet\_SHT4x\_5\.pdf
- Role Details: I2C T/RH sensor, address 0x44, local decoupling, place away from heat sources
- Manufacturer Name: Sensirion

**Pins:**
- SCL [pin 2]
- SDA [pin 1]
- VDD [pin 3]
- VSS [pin 4]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/jayjh/usb\-c\-wifi\-ble\-th\-sensor\~sz](https://flux.ai/jayjh/usb-c-wifi-ble-th-sensor~sz).*

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*Generated from [https://flux\.ai/jayjh/usb\-c\-wifi\-ble\-th\-sensor\~sz](https://flux.ai/jayjh/usb-c-wifi-ble-th-sensor~sz)*