# USB-C LiPo PIR Sensor ## Description Battery-powered infrared/PIR sensor board with USB-C charging, single-cell LiPo battery input, 3.3 V regulation, sensor output header, and status indicators. ## Project Details - **Owner:** iamsoroush - **Created:** 6/22/2026 - **Last Updated:** 6/22/2026 - **Visibility:** Public ## Key Components ### D2 — [ESD5341N](https://www.flux.ai/lcsc/esd5341n~k8iz.md) - LCSC Part Number: C3021106 - JLCPCB Part Class: Extended Part - Datasheet URL: https://www.lcsc.com/datasheet/C3021106.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VbVVxRR1JXUTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - License: https://creativecommons.org/licenses/by/4.0/ - Forward Voltage: 0.7V at 1AV - Manufacturer Name: TECH PUBLIC(台舟) - Diode Type: TVS Diode - Package or Case Code: DFN1006-2L-RD - Manufacturer Part Number: ESD5341N - Max Reverse Voltage: 5V - Part Type: TVS - Role: Protection - Role Details: 5V unidirectional TVS diode from protected VBUS to GND **Pins:** - 1 [pin 1] - 2 [pin 2] ### F2 — [MF-USHT050KX-2](https://www.flux.ai/adrian95/mf-usht050kx-2~jo.md) - Datasheet URL: https://www.bourns.com/docs/product-datasheets/mf-usht.pdf?sfvrsn=99f06af6_26 - Role Details: 500mA hold resettable PTC fuse in series with USB VBUS before MCP73831 charger - Manufacturer Part Number: MF-USHT050KX-2 - Part Type: Fuse - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection - Manufacturer Name: Bourns Inc. **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [USB4235-03-C](https://www.flux.ai/cherepanyadima/usb4235-03-c~sn.md) - Manufacturer Part Number: USB4235-03-C_REVA - Manufacturer Name: GST - Part Type: Connectors - Datasheet URL: https://gct.co/files/specs/usb4235-spec.pdf - Role: USB-C 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] - GND_A__1 [pin A12] - GND_B [pin B1] - GND_B__1 [pin B12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin SH1] - SHIELD__1 [pin SH2] - VBUS_A [pin A4] - VBUS_A__1 [pin A9] - VBUS_B [pin B4] - VBUS_B__1 [pin B9] ### J2 — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/lcsc/s2b-ph-k-slfsn~vk6f.md) - JLCPCB Part Class: Extended Part - Role: Battery Connector - Manufacturer Name: JST - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-S2B-PH-K-S-LF-SN_C173752.pdf - Part Type: Wire To Board / Wire To Wire Connector - Product Info Url: https://lcsc.com/product-detail/PH-Connectors_JST-Sales-America_S2B-PH-K-S-LF-SN_JST-Sales-America-S2B-PH-K-S-LF-SN_C173752.html - Package or Case Code: CONN-TH_S2B-PH-K-S-LF-SN - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) - LCSC Part Number: C173752 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role: Output Header **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### LED2 — [0603GBD0790S01](https://www.flux.ai/adrian95/0603gbd0790s01~iak.md) - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4336/0603GBD0790S01.pdf - Role Details: Illuminates while MCP73831 STAT/CHRG output is low during charging - Manufacturer Part Number: 0603GBD0790S01 - Part Type: LED - Manufacturer Name: ORIENTAL TECHNOLOGY - Role: Human Interface - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### TP1 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Part Type: Test Point - Testpoint Size: 0.5 - Role Details: Probe point for protected 5V VBUS rail - Role: Human Interface **Pins:** - P1 [pin 1] ### TP2 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Testpoint Size: 0.5 - Part Type: Test Point - Role: Human Interface - Role Details: Probe point for LiPo battery rail **Pins:** - P1 [pin 1] ### TP3 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: Probe point for regulated 3.3V rail - Part Type: Test Point - Role: Human Interface - Testpoint Size: 0.5 **Pins:** - P1 [pin 1] ### TP4 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: Ground probe/reference point - Part Type: Test Point - Testpoint Size: 0.5 - Role: Human Interface **Pins:** - P1 [pin 1] ### U1 — [MCP73831T-2DCI/OT](https://www.flux.ai/adrian95/mcp73831t-2dciot~0el.md) - Manufacturer Name: Microchip Technology - Role: LiPo Charger - Role Details: 4.2V single-cell charger, programmed for ~500mA charge current using 2kΩ PROG resistor - Part Type: Power Management - Manufacturer Part Number: MCP73831T-2DCI/OT - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP73831-Family-Data-Sheet-DS20001984H.pdf **Pins:** - BAT [pin 3] - CHRG [pin 1] - GND [pin 2] - PROG [pin 5] - VCC [pin 4] ### U2 — [MCP1703Ax-330xxTT](https://www.flux.ai/kicad-part-library/mcp1703ax-330xxtt~9wn.md) - Package or Case Code: SOT-23 - Datasheet URL: http://ww1.microchip.com/downloads/en/DeviceDoc/20005122B.pdf - Manufacturer Name: Microchip Technology Inc. - Manufacturer Part Number: MCP1703Ax-330xxTT - Role: 3.3V LDO - Role Details: 250mA max low-Iq regulator for PIR/interface rail; estimated load <50mA **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/iamsoroush/usb-c-lipo-pir-sensor~ro](https://www.flux.ai/iamsoroush/usb-c-lipo-pir-sensor~ro).* --- *Generated from [https://www.flux.ai/iamsoroush/usb-c-lipo-pir-sensor~ro](https://www.flux.ai/iamsoroush/usb-c-lipo-pir-sensor~ro)*