# Cortex v0 BLE Audio Wearable ## Description Cortex v0 tiny AI wearable schematic: Raytac MDBT53V-1M BLE/nRF5340 module, USB-C LiPo charging, TPS63020 3.3V buck-boost, dual microphones, QSPI flash, tactile button, and WS2812B LED on a ~30mm round 4-layer PCB. ## Project Details - **Owner:** checht - **Created:** 5/10/2026 - **Last Updated:** 5/11/2026 - **Visibility:** Public - **Accepted DRC Exception:** U3 TPS63020 EPAD: six overlapping-copper DRC errors accepted for v0 with note accepted-with-known-limitation: thermal vias missing, fix in rev-A. ## Key Components ### D1 — [PESD5V0L1BAZ](https://www.flux.ai/lcsc/pesd5v0l1baz~7d1o.md) - JLCPCB Part Class: Extended Part - Manufacturer Part Number: PESD5V0L1BAZ - Part Type: ESD Protection Devices - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - Package or Case Code: SOD-323_L1.8-W1.3-LS2.5-BI - Role Details: 5V-class TVS diode from USB_VBUS to GND near USB-C connector for ESD/transient protection - Product Info Url: https://lcsc.com/product-detail/presales_Nexperia-PESD5V0L1BAZ_C552554.html - Manufacturer Name: Nexperia(安世) - Role: TVS Protection - LCSC Part Number: C552554 **Pins:** - A [pin 2] - K [pin 1] ### D2 — [1N4148WS-7-F](https://www.flux.ai/adrian95/1n4148ws-7-f~jvm.md) - Role Details: 1N4148 flyback diode across coin ERM motor; cathode to motor positive, anode to MOSFET drain - Datasheet URL: https://www.diodes.com/assets/Datasheets/1N4148WS_BAV16WS.pdf - Manufacturer Part Number: 1N4148WS-7-F - Role: Flyback Diode - Manufacturer Name: Diodes Incorporated - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### J1 — [USB4235-03-C](https://www.flux.ai/cherepanyadima/usb4235-03-c~sn.md) - Datasheet URL: https://gct.co/files/specs/usb4235-spec.pdf - Role: USB-C Power Input - Role Details: USB-C sink connector for USB_VBUS charging input - Part Type: Connectors - Manufacturer Name: GST - Manufacturer Part Number: USB4235-03-C_REVA **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-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn~b96.md) - Part Type: Connector - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: JST Sales America Inc. - Role: Battery Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Role Details: 500mAh single-cell LiPo connector: VBAT and GND **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [TSW-105-07-G-S](https://www.flux.ai/adrian95/tsw-105-07-g-s~klw.md) - Part Type: Connector - Datasheet URL: https://suddendocs.samtec.com/catalog_english/tsw_th.pdf - Datasheet: https://suddendocs.samtec.com/productspecs/tsw-sxx.pdf - Manufacturer Part Number: TSW-105-07-G-S - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Samtec - Role Details: 5-pin SWD programming header: VDD, SWDIO, GND, SWDCLK, RESET_N - Role: SWD Debug Header **Pins:** - 01 [pin 01] - 02 [pin 02] - 03 [pin 03] - 04 [pin 04] - 05 [pin 05] ### LED1 — [WS2812B-MINI-V3/W](https://www.flux.ai/adrian95/ws2812b-mini-v3w~zqd.md) - Role: Status LED - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: WS2812B addressable RGB status indicator - Manufacturer Part Number: WS2812B-MINI-V3/W - Part Type: LED - Datasheet URL: https://www.lcsc.com/datasheet/C527089.pdf - Manufacturer Name: Worldsemi **Pins:** - DIN - DOUT - VDD - VSS ### M1 — [DC Motor](https://www.flux.ai/jharwinbarrozo/dc-motor~21.md) - Role: Haptic Motor - Manufacturer Name: Precision Microdrives - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 310-103 - Role Details: 10mm coin ERM vibration motor for approx. 200 ms boot confirmation pulse - Part Type: Mechanical **Pins:** - - - + ### MK1 — [SPH0645LM4H-B](https://www.flux.ai/vasy_skral/sph0645lm4h-b~ymg.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: I2S Microphone - Manufacturer Part Number: SPH0645LM4H-B - Manufacturer Name: Knowles - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Knowles%20Acoustics%20PDFs/SPH0645LM4H-B.pdf - Role Details: Digital air microphone connected to nRF5340 I2S on P1.00/P1.01/P1.02 - Symbol Style: Parametric - Part Type: Sensor **Pins:** - BCLK [pin 4] - DATA_OUT [pin 6] - GND [pin 3] - SELECT [pin 2] - VDD [pin 5] - WS [pin 1] ### PZ1 — [PKGS-00GXP1-R](https://www.flux.ai/cherepanyadima/pkgs-00gxp1-r.md) - Role Details: Placeholder/substitute for Murata 7BB-20-6L0 contact mic routed to ADC - Part Type: Sensor - Datasheet URL: https://componentsearchengine.com/Datasheets/1/PKGS-00GXP1-R.pdf - Manufacturer Name: Murata - Manufacturer Part Number: 7BB-20-6L0 - Role: Piezo Contact Microphone **Pins:** - 1 [pin 1] - 2 [pin 2] ### Q1 — [2N7002,215](https://www.flux.ai/adrian95/2n7002215~nwc.md) - Role: Motor Driver - Part Type: Transistor - Manufacturer Part Number: 2N7002,215 - Role Details: 2N7002 low-side switch controlled by nRF5340 GPIO for boot haptic coin ERM motor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Nexperia USA Inc. - Datasheet URL: https://assets.nexperia.com/documents/data-sheet/2N7002.pdf **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### SW1 — [PTS810SJK250SMTRLFS](https://www.flux.ai/jharwinbarrozo/pts810sjk250smtrlfs~6tl.md) - Part Type: Switch - Manufacturer Part Number: PTS810SJK250SMTRLFS - LCSC Part Number: C221896 - Datasheet URL: https://datasheet.lcsc.com/lcsc/1810121650_C-K-PTS810SJK250SMTRLFS_C221896.pdf - Role Details: Momentary active-low tactile button input - Manufacturer Name: C&K - Role: User Button **Pins:** - P1 [pin 1] - P3 [pin 3] ### SW2 — [OS102011MA1QN1](https://www.flux.ai/lcsc/os102011ma1qn1~acxn.md) - Role Details: SPST slide switch between LiPo VBAT and switched regulator input; MCP73831 charge path bypasses switch - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302203_C-K-OS102011MA1QN1_C226259.pdf - LCSC Part Number: C226259 - Manufacturer Name: C&K - Role: Power Switch - Product Info Url: https://lcsc.com/product-detail/Others_C-K-OS102011MA1QN1_C226259.html - Manufacturer Part Number: OS102011MA1QN1 - Package or Case Code: SW-TH_OS102011MA1QN1 - Part Type: Slide Switches - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### U1 — [MDBT53-1M](https://www.flux.ai/adrian95/ra1113112r~ljm.md) - Role: MCU/BLE Module - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MDBT53-1M - Manufacturer Name: Raytac - Datasheet URL: https://www.raytac.com/download/index.php?index_id=60 - Part Type: Integrated Circuit - Package or Case Code: MDBT531M - Role Details: Core processor and BLE radio for Cortex v0 **Pins:** - D- [pin 48] - D+ [pin 46] - DCC [pin 54] - DCCD [pin 50] - DCCH [pin 40] - DECD [pin 52] - DECR [pin 58] - GND_1 [pin 1] - GND_2 [pin 24] - GND_3 [pin 42] - GND_4 [pin 61] - P0.00/XL1 [pin 34] - P0.01/XL2 [pin 36] - P0.02/NFC1 [pin 32] - P0.03/NFC2 [pin 30] - P0.04 [pin 37] - P0.05 [pin 39] - P0.06 [pin 35] - P0.07 [pin 20] - P0.08 [pin 29] - P0.09 [pin 19] - P0.10 [pin 18] - P0.11 [pin 17] - P0.12 [pin 15] - P0.13 [pin 21] - P0.14 [pin 27] - P0.15 [pin 23] - P0.16 [pin 28] - P0.17 [pin 26] - P0.18 [pin 16] - P0.19 [pin 14] - P0.20 [pin 13] - P0.21 [pin 12] - P0.22 [pin 25] - P0.23 [pin 62] - P0.24 [pin 8] - P0.25 [pin 9] - P0.26 [pin 7] - P0.27 [pin 5] - P0.28 [pin 60] - P0.29 [pin 65] - P0.30 [pin 57] - P0.31 [pin 56] - P1.00 [pin 45] - P1.01 [pin 43] - P1.02 [pin 33] - P1.03 [pin 31] - P1.04 [pin 11] - P1.05 [pin 22] - P1.06 [pin 10] - P1.07 [pin 63] - P1.08 [pin 3] - P1.09 [pin 64] - P1.10 [pin 59] - P1.11 [pin 55] - P1.12 [pin 53] - P1.13 [pin 51] - P1.14 [pin 49] - P1.15 [pin 47] - RESET [pin 6] - SWDCLK [pin 2] - SWDIO [pin 4] - VBUS [pin 44] - VDD [pin 38] - VDDH [pin 41] ### U2 — [MCP73831T-2ATI/OT](https://www.flux.ai/adrian95/mcp73831t-2atiot~46p.md) - Role Details: Charges 500mAh single-cell LiPo from USB-C 5V input - Manufacturer Name: Microchip Technology - Manufacturer Part Number: MCP73831T-2ATI/OT - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP73831-Family-Data-Sheet-DS20001984H.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Battery Charger - Part Type: Integrated Circuit **Pins:** - PROG [pin 5] - STAT [pin 1] - VBAT [pin 3] - VDD [pin 4] - VSS [pin 2] ### U3 — [TPS63020DSJR](https://www.flux.ai/jecstronic/tps63020dsjr~tvs.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps63020.pdf - Manufacturer Name: Texas Instruments - Role Details: Regulates VBAT to stable 3.3V system rail - License: https://creativecommons.org/licenses/by/4.0/ - Role: 3V3 Buck-Boost Regulator - Part Type: Integrated Circuit - Manufacturer Part Number: TPS63020DSJR **Pins:** - EN [pin 12] - EPAD [pin 15] - FB [pin 3] - GND [pin 2] - L1 [pin 8] - L1 [pin 9] - L2 [pin 6] - L2 [pin 7] - PG [pin 14] - PS/SYNC [pin 13] - VIN [pin 11] - VIN [pin 10] - VINA [pin 1] - VOUT [pin 5] - VOUT [pin 4] ### U4 — [W25Q128JVSIQ](https://www.flux.ai/jecstronic/w25q128jvsiq~tqj.md) - Part Type: Integrated Circuit - Role: QSPI Flash - Manufacturer Part Number: W25Q128JVSIQ - Role Details: 16MB external flash on nRF5340 QSPI bus reassigned to P0.13-P0.18 - Manufacturer Name: Winbond Electronics - Datasheet URL: https://www.winbond.com/resource-files/W25Q128JV%20RevI%2008232021%20Plus.pdf **Pins:** - ~CS [pin 1] - CLK [pin 6] - DI(IO0) [pin 5] - DO(IO1) [pin 2] - GND [pin 4] - IO2 [pin 3] - IO3 [pin 7] - VCC [pin 8] ### U5 — [MCP6001T-I-OT](https://www.flux.ai/jecstronic/mcp6001t-i-ot~s1u.md) - Manufacturer Part Number: MCP6001T-I/OT - Role Details: MCP6001 unity-gain buffer for high-impedance piezo sensor; output low-pass filtered near 4 kHz before nRF5340 SAADC - Part Type: Operational Amplifier (OP-AMP) - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf - Manufacturer Name: Microchip Technology - Role: Piezo Buffer **Pins:** - - [pin 4] - + [pin 3] - OUTPUT [pin 1] - V- [pin 2] - V+ [pin 5] ### U6 — [TPS22918DBVR](https://www.flux.ai/lcsc/tps22918dbvr~lajs.md) - Manufacturer Name: TI(德州仪器) - Part Type: Power Distribution Switches - Datasheet URL: https://lcsc.com/product-detail/PMIC-Power-Distribution-Switches_TI_TPS22918DBVR_TPS22918DBVR_C131941.html - LCSC Part Number: C131941 - Product Info Url: https://lcsc.com/product-detail/PMIC-Power-Distribution-Switches_TI_TPS22918DBVR_TPS22918DBVR_C131941.html - Manufacturer Part Number: TPS22918DBVR - JLCPCB Part Class: Extended Part - Role: Load Switch - Role Details: GPIO-controlled TPS22918 load switch gating WS2812B LED power to remove off-state quiescent LED draw - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR **Pins:** - CT [pin 4] - GND [pin 2] - ON [pin 3] - QOD [pin 5] - VIN [pin 1] - VOUT [pin 6] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/checht/cortex-v0-ble-audio-wearable~bq](https://www.flux.ai/checht/cortex-v0-ble-audio-wearable~bq).* --- *Generated from [https://www.flux.ai/checht/cortex-v0-ble-audio-wearable~bq](https://www.flux.ai/checht/cortex-v0-ble-audio-wearable~bq)*