# USB-C Wi-Fi BLE Env Sensor Node ## Description Low-power USB-C powered environmental sensor node with a protected 5 V USB-C sink input, TPS26630 front-end protection for reverse/OVP/UVLO/OCP, efficient 3.3 V buck regulation, ESP32-C3 Wi-Fi plus BLE connectivity, and an I2C SHT41 temperature/relative-humidity sensor. The design targets robust operation from USB-C sources advertising 0.5 A to 3 A and is being completed as a schematic ready for PCB layout. ## Project Details - **Owner:** gianfry - **Created:** 4/22/2026 - **Last Updated:** 4/23/2026 - **Visibility:** Public - **Stars:** 1 ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/vasy_skral/usblc6-2sc6~g1b.md) - License: https://creativecommons.org/licenses/by/4.0/ - 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: USB ESD Protection - Package: SOT-23-6 - Part Type: Protection - Symbol Style: parametric-v1 - LCSC Part Number: C7519 - Manufacturer Name: STMicroelectronics - Manufacturer Part Number: USBLC6-2SC6 - Role Details: Protects external USB-C VBUS and D+ D- lines against ESD and surge events at the connector **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [Generic Diode](https://www.flux.ai/jharwinbarrozo/generic-diode-1l3gh~h9.md) - Role: Buck Bootstrap Diode - Role Details: Diode from buck output to BST network as required for bootstrap drive support - Package: SMD_SOD-123 - Part Type: Diode **Pins:** - A [pin 2] - K [pin 1] ### IC1 — [SHT41A-AD1B-R2](https://www.flux.ai/adrian95/sht41a-ad1b-r2~cn5.md) - Role Details: Low-power digital I2C temperature and relative-humidity sensor for environmental monitoring - License: https://creativecommons.org/licenses/by/4.0/ - Role: Temperature Humidity Sensor - Manufacturer Part Number: SHT41A-AD1B-R2 - Part Type: Sensor - Manufacturer Name: Sensirion - Package: SHT4x SMD - Datasheet URL: https://sensirion.com/media/documents/74781FD7/62DF8CD1/Datasheet_SHT4xA.pdf - Package or Case Code: SON80P150X150X59-5N **Pins:** - EP [pin 5] - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### J1 — [USB4215-03-A](https://www.flux.ai/adrian95/usb4215-03-a~kg3.md) - Datasheet URL: {"url":"https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/6328/USB4215-03-A1.pdf","text":"https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/6328/USB4215-03-A1.pdf"} - Package: USB-C receptacle - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: USB C - Manufacturer Part Number: USB4215-03-A - Role Details: USB-C receptacle carrying VBUS, GND, CC1, and CC2 for 5 V sink power entry - Package or Case Code: GCT_USB4215-03-A_REVA - Manufacturer Name: GCT - Role: USB Power Input **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND_A [pin A1_B12] - GND_B [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin SH1] - SHIELD [pin SH4] - SHIELD [pin SH2] - SHIELD [pin SH3] - VBUS_A [pin A4_B9] - VBUS_B [pin B4_A9] ### Q1 — [BSS138](https://www.flux.ai/vasy_skral/bss138~3ld.md) - Manufacturer Name: onsemi - Role: Blocking FET - Role Details: External NFET driven by the protection IC B_GATE pin to improve reverse current and reverse polarity blocking behavior - Manufacturer Part Number: BSS138 - Package: SOT-23-3 - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### U1 — [TPS26630RGER](https://www.flux.ai/jecstronic/tps26630rger~cq.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps2663.pdf - Role: USB Input Protection - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments - Manufacturer Part Number: TPS26630RGER - Role Details: Primary protected power path device implementing reverse blocking, over-voltage cutoff, under-voltage lockout, and over-current limiting for the USB-C input - Package: VQFN-24 **Pins:** - B_GATE [pin 3] - DRV [pin 4] - DVDT [pin 9] - FLT_N [pin 14] - GND [pin 8] - ILIM [pin 10] - IMON [pin 13] - IN [pin 2] - IN [pin 1] - IN_SYS [pin 5] - MODE [pin 11] - NC [pin 20] - NC [pin 24] - NC [pin 22] - NC [pin 21] - NC [pin 23] - NC [pin 19] - OUT [pin 18] - OUT [pin 17] - OVP [pin 7] - PAD [pin 25] - PGOOD [pin 16] - PGTH [pin 15] - SHDN_N [pin 12] - UVLO [pin 6] ### U2 — [AP63203WU-7](https://www.flux.ai/lcsc/ap63203wu-7~j9cl.md) - Part Type: AC-DC Controllers & Regulators - Manufacturer Part Number: AP63203WU-7 - Package or Case Code: TSOT-26_L2.9-W1.6-P0.95-LS2.8-BL - JLCPCB Part Class: Extended Part - Operating Voltage: 4.5V to 60V - LCSC Part Number: C780769 - Manufacturer Name: DIODES(美台) - Frequency: 1100kHz - Max Input Voltage: 3.8~32V - Role Details: Converts protected 5 V input rail to efficient 3.3 V rail sized for Wi-Fi current bursts - Output Current: 2A - IC Type: Synchronous Buck Converter - Package: TSOT-23-6 - Operating Temperature: -40 ~ +85℃ - Role: 3.3V Buck Regulator - Max Output Voltage: 3.3V **Pins:** - BST [pin 6] - EN [pin 2] - FB [pin 1] - GND [pin 4] - SW [pin 5] - VIN [pin 3] ### U3 — [ESP32-C3-MINI-1-N4](https://www.flux.ai/adrian95/esp32-c3-mini-1-n4~ufg.md) - Symbol Style: parametric-v1 - Manufacturer Part Number: ESP32-C3-MINI-1-N4 - Role Details: Main controller with 2.4 GHz 802.11 b/g/n Wi-Fi and BLE 5 used for sensing and wireless connectivity - Integrated Circuit Type: RF Device - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-mini-1_datasheet_en.pdf - Package: ESP32-C3-MINI module - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Module - Role: Wi-Fi BLE MCU - Manufacturer Name: Espressif **Pins:** - 3V3 [pin 3] - EN [pin 8] - GND [pin 14] - GND [pin 49_5] - GND [pin 48] - GND [pin 52] - GND [pin 45] - GND [pin 2] - GND [pin 49_8] - GND [pin 1] - GND [pin 49_9] - GND [pin 49_2] - GND [pin 53] - GND [pin 49_6] - GND [pin 43] - GND [pin 42] - GND [pin 44] - GND [pin 49_7] - GND [pin 51] - GND [pin 46] - GND [pin 39] - GND [pin 41] - GND [pin 50] - GND [pin 49_3] - GND [pin 11] - GND [pin 38] - GND [pin 40] - GND [pin 37] - GND [pin 49_1] - GND [pin 49_4] - GND [pin 47] - GND [pin 36] - IO0 [pin 12] - IO1 [pin 13] - IO10 [pin 16] - IO18 [pin 26] - IO19 [pin 27] - IO2 [pin 5] - IO3 [pin 6] - IO4 [pin 18] - IO5 [pin 19] - IO6 [pin 20] - IO7 [pin 21] - IO8 [pin 22] - IO9 [pin 23] - NC [pin 32] - NC [pin 15] - NC [pin 34] - NC [pin 4] - NC [pin 29] - NC [pin 33] - NC [pin 17] - NC [pin 25] - NC [pin 10] - NC [pin 9] - NC [pin 24] - NC [pin 28] - NC [pin 7] - NC [pin 35] - RXD0 [pin 30] - TXD0 [pin 31] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/gianfry/usb-c-wi-fi-ble-env-sensor-node~by](https://www.flux.ai/gianfry/usb-c-wi-fi-ble-env-sensor-node~by).* --- *Generated from [https://www.flux.ai/gianfry/usb-c-wi-fi-ble-env-sensor-node~by](https://www.flux.ai/gianfry/usb-c-wi-fi-ble-env-sensor-node~by)*