# Luminous Cap BLE Wearable ## Description Small nRF52832 BLE wearable PCB for a clothes-hanger rail clip, targeting ~20×65 mm 2-layer JLCPCB production with LCSC-preferred parts. ## Project Details - **Owner:** xhenium - **Created:** 7/1/2026 - **Last Updated:** 7/1/2026 - **Visibility:** Public - **Connectivity:** Bluetooth - **Implementation Details:** 2-layer PCB, ~20x65 mm, JLCPCB/LCSC preferred, SWD programming, 15000-unit target - **Operating Voltage:** 3.3V - **Domain:** Wearable - **Power Requirements:** Battery ## Key Components ### D1 — [B5819W](https://www.flux.ai/lcsc/b5819w~6npr.md) - Manufacturer Part Number: B5819W - Diode Type: Schottky Diode - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_B5819W_C109213.html - Package or Case Code: SOD-123_L2.8-W1.8-LS3.7-RD - JLCPCB Part Class: Extended Part - Part Type: Schottky Barrier Diodes (SBD) - Forward Voltage: 0.45V at 1AV - Role Details: Bridge rectifier diode; B5819W SOD-123 40V 1A Schottky - Manufacturer Name: SHIKUES(时科) - Role: Rectification - Max Reverse Voltage: 40V - LCSC Part Number: C109213 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810251911_Shikues-B5819W_C109213.pdf **Pins:** - A [pin 2] - K [pin 1] ### D2 — [B5819W](https://www.flux.ai/lcsc/b5819w~6npr.md) - Max Reverse Voltage: 40V - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810251911_Shikues-B5819W_C109213.pdf - LCSC Part Number: C109213 - Role: Rectification - Part Type: Schottky Barrier Diodes (SBD) - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_B5819W_C109213.html - Package or Case Code: SOD-123_L2.8-W1.8-LS3.7-RD - Manufacturer Part Number: B5819W - Diode Type: Schottky Diode - Role Details: Bridge rectifier diode; B5819W SOD-123 40V 1A Schottky - Forward Voltage: 0.45V at 1AV - Manufacturer Name: SHIKUES(时科) **Pins:** - A [pin 2] - K [pin 1] ### D3 — [B5819W](https://www.flux.ai/lcsc/b5819w~6npr.md) - Manufacturer Name: SHIKUES(时科) - Role: Rectification - Part Type: Schottky Barrier Diodes (SBD) - JLCPCB Part Class: Extended Part - Package or Case Code: SOD-123_L2.8-W1.8-LS3.7-RD - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_B5819W_C109213.html - Manufacturer Part Number: B5819W - Diode Type: Schottky Diode - Role Details: Bridge rectifier diode; B5819W SOD-123 40V 1A Schottky - Forward Voltage: 0.45V at 1AV - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810251911_Shikues-B5819W_C109213.pdf - LCSC Part Number: C109213 - Max Reverse Voltage: 40V **Pins:** - A [pin 2] - K [pin 1] ### D4 — [B5819W](https://www.flux.ai/lcsc/b5819w~6npr.md) - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_B5819W_C109213.html - Package or Case Code: SOD-123_L2.8-W1.8-LS3.7-RD - Manufacturer Part Number: B5819W - Diode Type: Schottky Diode - Part Type: Schottky Barrier Diodes (SBD) - JLCPCB Part Class: Extended Part - Forward Voltage: 0.45V at 1AV - Manufacturer Name: SHIKUES(时科) - Role: Rectification - Max Reverse Voltage: 40V - LCSC Part Number: C109213 - Role Details: Bridge rectifier diode; B5819W SOD-123 40V 1A Schottky - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810251911_Shikues-B5819W_C109213.pdf **Pins:** - A [pin 2] - K [pin 1] ### D5 — [B5819W](https://www.flux.ai/lcsc/b5819w~6npr.md) - Role Details: B5819W SOD-123 clamp: cathode to VSRC_PROT, anode to GND - Manufacturer Name: SHIKUES(时科) - Forward Voltage: 0.45V at 1AV - JLCPCB Part Class: Extended Part - Part Type: Schottky Barrier Diodes (SBD) - Manufacturer Part Number: B5819W - Diode Type: Schottky Diode - Package or Case Code: SOD-123_L2.8-W1.8-LS3.7-RD - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_B5819W_C109213.html - Role: VSRC reverse-polarity clamp - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810251911_Shikues-B5819W_C109213.pdf - LCSC Part Number: C109213 - Max Reverse Voltage: 40V **Pins:** - A [pin 2] - K [pin 1] ### D6 — [B5819W](https://www.flux.ai/lcsc/b5819w~6npr.md) - Forward Voltage: 0.45V at 1AV - Role Details: Power-OR diode: anode to VBUS_IN, cathode to VIN - JLCPCB Part Class: Extended Part - Role: Rectification - Part Type: Schottky Barrier Diodes (SBD) - Manufacturer Part Number: B5819W - Diode Type: Schottky Diode - Package or Case Code: SOD-123_L2.8-W1.8-LS3.7-RD - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_B5819W_C109213.html - Manufacturer Name: SHIKUES(时科) - Max Reverse Voltage: 40V - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810251911_Shikues-B5819W_C109213.pdf - LCSC Part Number: C109213 **Pins:** - A [pin 2] - K [pin 1] ### D7 — [B5819W](https://www.flux.ai/lcsc/b5819w~6npr.md) - Manufacturer Name: SHIKUES(时科) - Role Details: Power-OR diode: anode to VSRC_PROT, cathode to VIN - JLCPCB Part Class: Extended Part - Part Type: Schottky Barrier Diodes (SBD) - Manufacturer Part Number: B5819W - Diode Type: Schottky Diode - Package or Case Code: SOD-123_L2.8-W1.8-LS3.7-RD - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_B5819W_C109213.html - Forward Voltage: 0.45V at 1AV - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810251911_Shikues-B5819W_C109213.pdf - LCSC Part Number: C109213 - Max Reverse Voltage: 40V - Role: Rectification **Pins:** - A [pin 2] - K [pin 1] ### D8 — [PESD5V0L1BA](https://www.flux.ai/lcsc/pesd5v0l1ba~g3sp.md) - Role Details: 5 V working-voltage low-cap ESD clamp for exposed DATA_IN UART pogo line; pin 1 to GND, pin 2 to DATA_IN - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - JLCPCB Part Class: Extended Part - LCSC Part Number: C2687118 - Role: Protection - Manufacturer Part Number: PESD5V0L1BA - Manufacturer Name: UMW(友台半导体) - Part Type: ESD Protection Devices **Pins:** - A [pin 2] - K [pin 1] ### D9 — [SD05](https://www.flux.ai/lcsc/sd05~9hd8.md) - Product Info Url: https://lcsc.com/product-detail/TVS_MDD-Microdiode-Electronics-SD05_C502527.html - JLCPCB Part Class: Extended Part - Package or Case Code: SOD-323_L1.8-W1.3-LS2.5-RD - Diode Type: Schottky Diode - Manufacturer Part Number: SD05 - Max Reverse Voltage: 50V - Role Details: VBUS_IN TVS clamp to GND for exposed pogo power rail; place close to rail-contact connector/bridge output return path. - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2407291901_MDD-Microdiode-Semiconductor-SD05_C502527.pdf - Forward Voltage: 0.45V to 0.55V - Manufacturer Name: MDD - Part Type: TVS - LCSC Part Number: C502527 - Role: Protection **Pins:** - A [pin 2] - K [pin 1] ### F1 — [0603L050YR](https://www.flux.ai/lcsc/0603l050yr~ua87.md) - Manufacturer Name: Littelfuse Inc. - Product Info Url: https://lcsc.com/product-detail/Surface-Mount-Fuses_Littelfuse_0603L050YR_Littelfuse-0603L050YR_C207015.html - JLCPCB Part Class: Extended Part - Package or Case Code: F0603 - Role Details: 500 mA hold, 1 A trip, 6 V max resettable fuse in series from source positive VSRC to protected source rail VSRC_PROT feeding OR diode D7. - Datasheet URL: https://www.littelfuse.com/assetdocs/resettable-ptcs-0603l-datasheet?assetguid=879563f9-97a7-4e71-adba-37de085b333f - Part Type: Resettable Fuses - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 0603L050YR - Role: VSRC series PTC fuse - LCSC Part Number: C207015 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [S3B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s3b-ph-sm4-tblfsn~q3c.md) - Manufacturer Name: JST Sales America Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Connector Type: JST-PH - Manufacturer Part Number: S3B-PH-SM4-TB(LF)(SN) - Role Details: Pin 1/3 are reversible VBUS/GND rail contacts; pin 2 is DATA_IN center contact - Connector Pitch: 2.0mm - Connector Positions: 3 **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J2 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/lcsc/s2b-ph-sm4-tblfsn~dy5m.md) - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - Connector Pitch: 2mm - Role Details: Common 2-pin JST-PH footprint for either 20–30 F supercapacitor or ~200 mAh single-cell LiPo with wire leads. Positive=VSRC, negative=GND. Populate only one matching charge option: LiPo charger U3/R8/C16/C17 or supercap resistor R9. - Connector Type: Wire-to-board connector - Product Info Url: https://lcsc.com/product-detail/_JST-Sales-America_S2B-PH-SM4-TB-LF-SN_JST-Sales-America-S2B-PH-SM4-TB-LF-SN_C295747.html - Connector Gender: Female - Connector Positions: 2 - Part Type: Wire To Board / Wire To Wire Connector - LCSC Part Number: C295747 - JLCPCB Part Class: Extended Part - Manufacturer Name: JST - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2102031704_JST-S2B-PH-SM4-TB-LF-SN_C295747.pdf - Role: Energy Storage - Package or Case Code: CONN-SMD_P2.00_S2B-PH-SM4-TB-LF-SN - Connector Rows: 1 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J3 — [S3B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s3b-ph-sm4-tblfsn~q3c.md) - Part Type: Connector - Connector Positions: 3 - License: https://creativecommons.org/licenses/by/4.0/ - Connector Pitch: 2.0mm - Role Details: Left short-edge external common-cathode bicolor LED connector. Pin 1 common cathode to GND, pin 2 color 1 anode via R15 to U1 P0.13, pin 3 color 2 anode via R16 to U1 P0.14. - Manufacturer Name: JST Sales America Inc. - Connector Type: JST-PH - Manufacturer Part Number: S3B-PH-SM4-TB(LF)(SN) - Role: Human Interface - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J4 — [S3B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s3b-ph-sm4-tblfsn~q3c.md) - Connector Pitch: 2.0mm - Manufacturer Part Number: S3B-PH-SM4-TB(LF)(SN) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Role: Human Interface - Part Type: Connector - Connector Positions: 3 - Manufacturer Name: JST Sales America Inc. - Connector Type: JST-PH - Role Details: Right short-edge external common-cathode bicolor LED connector. Pin 1 common cathode to GND, pin 2 color 1 anode via R17 to U1 P0.11, pin 3 color 2 anode via R18 to U1 P0.12. - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### Q1 — [AO3400A](https://www.flux.ai/lcsc/ao3400a~e5y2.md) - Part Type: MOSFETs - Role: Switching - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010301_UMW-Youtai-Semiconductor-Co---Ltd--AO3400A_C347475.pdf - LCSC Part Number: C347475 - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - Product Info Url: https://lcsc.com/product-detail/Others_Youtai-Semiconductor-Co-Ltd-AO3400A-5-8A_C347475.html - Continuous Drain Current: 5.7A - Drain to Source Voltage: 30V - Manufacturer Part Number: AO3400A - Role Details: Low-side NMOS for switched VSRC sense divider. Gate driven by VBAT_SENSE_EN; drain to bottom of R13; source to GND. LCSC C347475, JLCPCB Extended. - Power: 1.4W - Operating Temperature: -55 ~ +150℃ - Transistor Type: N-channel MOSFET - JLCPCB Part Class: Extended Part - Manufacturer Name: UMW(友台半导体) **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### U1 — [NRF52810-QFAA-T](https://www.flux.ai/lcsc/nrf52810-qfaa-t~4ho.md) - Package or Case Code: QFN-48_L6.0-W6.0-P0.40-BL-EP4.6 - Power Requirements: Battery - JLCPCB Part Class: Extended Part - Role: Logic - Part Type: RF Transceiver ICs - Manufacturer Part Number: NRF52810-QFAA-T - Manufacturer Name: NORDIC - LCSC Part Number: C1558383 - Connectivity: Bluetooth **Pins:** - ANT [pin 30] - DCC [pin 47] - DEC1 [pin 1] - DEC2 [pin 32] - DEC3 [pin 33] - DEC4 [pin 46] - NC [pin 44] - P0.00/XL1 [pin 2] - P0.01/XL2 [pin 3] - P0.02/AIN0 [pin 4] - P0.03/AIN1 [pin 5] - P0.04/AIN2 [pin 6] - P0.05/AIN3 [pin 7] - P0.06 [pin 8] - P0.07 [pin 9] - P0.08 [pin 10] - P0.09 [pin 11] - P0.10 [pin 12] - P0.11 [pin 14] - P0.12 [pin 15] - P0.13 [pin 16] - P0.14 [pin 17] - P0.15 [pin 18] - P0.16 [pin 19] - P0.17 [pin 20] - P0.19 [pin 22] - P0.20 [pin 23] - P0.21/nRESET [pin 24] - P0.22 [pin 27] - P0.23 [pin 28] - P0.26 [pin 38] - P0.27 [pin 39] - P0.28/AIN4 [pin 40] - P0.30/AIN6 [pin 42] - P0.31/AIN7 [pin 43] - PO.18 [pin 21] - PO.24 [pin 29] - PO.25 [pin 37] - PO.29/AIN5 [pin 41] - SWDCLK [pin 25] - SWDIO [pin 26] - VDD [pin 13] - VDD [pin 36] - VDD [pin 48] - VSS [pin 31] - VSS [pin 49] - VSS [pin 45] - XC1 [pin 34] - XC2 [pin 35] ### U2 — [XC6206P332MR](https://www.flux.ai/lcsc/xc6206p332mr~x6yo.md) - JLCPCB Part Class: Extended Part - Role: Power Conversion - Role Details: 3.3 V LDO for nRF52810 rail. VIN from diode-ORed VBUS_IN/VSRC; VOUT to 3V3. Typical Iq 7 µA per datasheet; current/thermal margin to be revisited after LED/load budget. - Manufacturer Part Number: XC6206P332MR - LCSC Part Number: C347376 - Part Type: Linear Voltage Regulators (LDO) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2407250919_UMW-Youtai-Semiconductor-Co---Ltd--XC6206P332MR_C347376.pdf - Manufacturer Name: UMW(友台半导体) - Product Info Url: https://lcsc.com/product-detail/Others_Youtai-Semiconductor-Co-Ltd-XC6206P332MR_C347376.html - Package or Case Code: SOT-23-3_L3.0-W1.7-P0.95-LS2.9-BR **Pins:** - VIN [pin 3] - VOUT [pin 2] - VSS [pin 1] ### U4 — [TL431](https://www.flux.ai/lcsc/tl431~qib4.md) - Operating Voltage: 2.5V to 36V - Power Consumtion: 0.001W - Role: Voltage Reference - Manufacturer Name: SHIKUES(时科) - Part Type: Voltage References - LCSC Part Number: C111578 - Manufacturer Part Number: TL431 - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_1810111320_Shikues-TL431_C111578.pdf - Logic Function: Adjustable Shunt Voltage Regulator - IC Type: Voltage References - Product Info Url: https://lcsc.com/product-detail/Voltage-References_TL431_C111578.html - Role Details: Populate U4/R10/R11 only for supercap build with R9. Cathode to VSRC, anode to GND, REF from divider. Clamp setpoint ≈3.81 V. Expected TL431 dissipation ≈18 mW at VBUS_IN=4.3 V through R9=100Ω; ≈45 mW if VBUS_IN=5.0 V. - JLCPCB Part Class: Extended Part - Frequency: not specificHz - Package or Case Code: SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR **Pins:** - AN [pin 3] - CAT [pin 2] - REF [pin 1] ### Y1 — [CS06654-32M](https://www.flux.ai/jecstronic/cs06654-32m~6j.md) - Datasheet URL: https://www.ndk.com/images/products/catalog/c_NX2016SA_e.pdf - Role: Timing - Part Type: Oscillator - Manufacturer Name: NDK America, Inc. - Manufacturer Part Number: CS06654-32M - Frequency: 32MHz - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### Y2 — [ECS-.327-6-34QCS-TR](https://www.flux.ai/adrian95/ecs-p327-6-34qcs-tr~2fv.md) - Manufacturer Name: ECS Inc. - Datasheet URL: https://ecsxtal.com/store/pdf/ECX-34Q.pdf - Manufacturer Part Number: ECX-.327-CDX-2096 - Role: Timing - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Oscillator - Frequency: 32.768kHz **Pins:** - 1 [pin 1] - 2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/xhenium/luminous-cap-ble-wearable~6u](https://www.flux.ai/xhenium/luminous-cap-ble-wearable~6u).* --- *Generated from [https://www.flux.ai/xhenium/luminous-cap-ble-wearable~6u](https://www.flux.ai/xhenium/luminous-cap-ble-wearable~6u)*