# HYPNOEEG V2 da15 4446 ## Description Ultra-Compact 2-Layer PCB Redesign with Preserved Stackup and Net Classes (SPI / Analog / Power) ## Project Details - **Owner:** brianbenchoff - **Created:** 3/11/2026 - **Last Updated:** 3/18/2026 - **Visibility:** Public - **Connectivity:** Bluetooth - **System Architecture:** flowchart TD USB_C[USB-C Connector\n(Charge Only)] TP4056[Li-ion Charger\n(TP4056)] Battery[Li-ion Battery] BAT54C[Reverse Polarity Diode\n(BAT54C)] PowerGating[Power Gating Logic] AP2112[3.3V LDO\n(AP2112)] ABX00030[Arduino Nano 33 BLE] ADS1299[EEG Front-End\n(ADS1299)] Pogo[1x10 Pogo-Pin\nElectrode Connector] Jumper[Programming Jumper] USB_C -->|VBUS| TP4056 TP4056 -->|Charge| Battery Battery --> BAT54C --> AP2112 USB_C -->|VBUS| PowerGating -->|EN| AP2112 AP2112 -->|3.3V| ABX00030 AP2112 -->|3.3V| ADS1299 ABX00030 -->|SPI| ADS1299 ADS1299 -->|EEG Signals| Pogo Jumper -->|Override EN| PowerGating - **NetClass:SPI:** SCLK, DIN, DOUT, CS, DRDY - **Stackup:** Standard 2 Layer (L2=GND, L3=3.3 V) - **Manufacturing Quantity Target:** 1 - **NetClass:Analog:** IN1P, IN1N, IN2P, IN2N, IN3P, IN3N, IN4P, IN4N, IN5P, IN5N, IN6P, IN6N, IN7P, IN7N, IN8P, IN8N, VREFP, VREFN, SRB1, SRB2, BIASREF, BIASIN, BIASOUT - **License:** https://creativecommons.org/licenses/by/4.0/ - **Power Requirements:** USB - **NetClass:Power:** VBUS, 3.3V - **Parts Available review status:** Parts Available review passed after replacements; all components are available and mapped to stocked library parts. - **C6 layout fix:** C6 was fully disconnected, nearby unintended traces removed, then reconnected as a 100 nF decoupling cap between U3:VOUT (3.3V rail feeding ADS1299 DVDD_1) and GND. No changes to board outline; ERC/DRC used to verify corrected connectivity and clearances around C6, with plane usage and rules left consistent with existing 4-layer stackup (L2=GND, L3=3.3V). - **Software:** Arduino - **GND_Fills:** Top, Bottom - **Domain:** Medical ## Key Components ### BAT1 — [MY-2477-02](https://www.flux.ai/lcsc/my-2477-02.md) - Manufacturer Name: MYOUNG(美阳) - Part Type: Battery Connectors - LCSC Part Number: C2979175 - Manufacturer Part Number: MY-2477-02 - JLCPCB Part Class: Extended Part - Package or Case Code: BAT-SMD_MY-2477-02 **Pins:** - BAT- [pin 3] - BAT+ [pin 2] - BAT+ [pin 1] ### D1 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Diode Type: TVS Diode - JLCPCB Part Class: Extended Part - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - Max Reverse Voltage: 5V - LCSC Part Number: C2827694 - Manufacturer Name: TECH PUBLIC(台舟) - Manufacturer Part Number: PESD5V0S1BA - Part Type: ESD Protection Devices **Pins:** - 1 [pin 1] - 2 [pin 2] ### D10 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Part Type: ESD Protection Devices - Manufacturer Part Number: PESD5V0S1BA - Manufacturer Name: TECH PUBLIC(台舟) - LCSC Part Number: C2827694 - Max Reverse Voltage: 5V - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - JLCPCB Part Class: Extended Part - Diode Type: TVS Diode **Pins:** - 1 [pin 1] - 2 [pin 2] ### D11 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Manufacturer Name: TECH PUBLIC(台舟) - Manufacturer Part Number: PESD5V0S1BA - Part Type: ESD Protection Devices - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - Forward Voltage: 0.8V - Diode Type: TVS Diode - JLCPCB Part Class: Extended Part - Max Reverse Voltage: 5V - LCSC Part Number: C2827694 **Pins:** - 1 [pin 1] - 2 [pin 2] ### D2 — [ESD5Z3.3T1G](https://www.flux.ai/lcsc/esd5z3p3t1g.md) - Manufacturer Part Number: ESD5Z3.3T1G - Package: SOD-523_L1.2-W0.8-LS1.6-FD - Part Type: ESD Protection Devices - LCSC Part Number: C2827729 - Package or Case Code: SOD-523_L1.2-W0.8-LS1.6-FD - Role: Protection - Manufacturer Name: TECH PUBLIC(台舟) - Role Details: ESD protection for USB D+ and D- data lines - JLCPCB Part Class: Extended Part **Pins:** - A [pin 1] - K [pin 2] ### D3 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - Forward Voltage: 0.8V - Diode Type: TVS Diode - JLCPCB Part Class: Extended Part - LCSC Part Number: C2827694 - Max Reverse Voltage: 5V - Manufacturer Name: TECH PUBLIC(台舟) - Part Type: ESD Protection Devices - Manufacturer Part Number: PESD5V0S1BA **Pins:** - 1 [pin 1] - 2 [pin 2] ### D4 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Max Reverse Voltage: 5V - LCSC Part Number: C2827694 - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - JLCPCB Part Class: Extended Part - Diode Type: TVS Diode - Manufacturer Part Number: PESD5V0S1BA - Part Type: ESD Protection Devices - Manufacturer Name: TECH PUBLIC(台舟) **Pins:** - 1 [pin 1] - 2 [pin 2] ### D5 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Max Reverse Voltage: 5V - LCSC Part Number: C2827694 - Diode Type: TVS Diode - JLCPCB Part Class: Extended Part - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - Manufacturer Part Number: PESD5V0S1BA - Part Type: ESD Protection Devices - Manufacturer Name: TECH PUBLIC(台舟) **Pins:** - 1 [pin 1] - 2 [pin 2] ### D6 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Manufacturer Name: TECH PUBLIC(台舟) - Manufacturer Part Number: PESD5V0S1BA - Part Type: ESD Protection Devices - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - JLCPCB Part Class: Extended Part - Diode Type: TVS Diode - Max Reverse Voltage: 5V - LCSC Part Number: C2827694 **Pins:** - 1 [pin 1] - 2 [pin 2] ### D7 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Max Reverse Voltage: 5V - LCSC Part Number: C2827694 - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - JLCPCB Part Class: Extended Part - Diode Type: TVS Diode - Manufacturer Part Number: PESD5V0S1BA - Part Type: ESD Protection Devices - Manufacturer Name: TECH PUBLIC(台舟) **Pins:** - 1 [pin 1] - 2 [pin 2] ### D8 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - JLCPCB Part Class: Extended Part - Diode Type: TVS Diode - LCSC Part Number: C2827694 - Max Reverse Voltage: 5V - Manufacturer Name: TECH PUBLIC(台舟) - Part Type: ESD Protection Devices - Manufacturer Part Number: PESD5V0S1BA **Pins:** - 1 [pin 1] - 2 [pin 2] ### D9 — [PESD5V0S1BA](https://www.flux.ai/lcsc/pesd5v0s1ba.md) - Forward Voltage: 0.8V - Package or Case Code: SOD-323_L1.7-W1.3-LS2.5-BI - JLCPCB Part Class: Extended Part - Diode Type: TVS Diode - Max Reverse Voltage: 5V - LCSC Part Number: C2827694 - Manufacturer Name: TECH PUBLIC(台舟) - Manufacturer Part Number: PESD5V0S1BA - Part Type: ESD Protection Devices **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [CX90M-16P](https://www.flux.ai/jecstronic/cx90m-16p.md) - Part Type: Connector - Datasheet URL: https://www.mouser.com/datasheet/2/185/CX90M_16P_CL0480_0513_0_00_2DDrawing_D174082_en-1610999.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Hirose Electric Co Ltd - Manufacturer Part Number: CX90M-16P **Pins:** - CC1 [pin A5] - CC2 [pin B5] - D- [pin A7] - D- [pin B7] - D+ [pin B6] - D+ [pin A6] - GND [pin A12] - GND [pin B12] - GND [pin A1] - GND [pin B1] - MID1 [pin MID1] - MID2 [pin MID2] - SBU1 [pin A8] - SBU2 [pin B8] - VBUS [pin B4] - VBUS [pin A9] - VBUS [pin B9] - VBUS [pin A4] ### J2 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### LED1 — [WP710A10SGD](https://www.flux.ai/jecstronic/wp710a10sgd.md) - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Kingbright - Datasheet URL: https://www.kingbrightusa.com/images/catalog/SPEC/WP710A10SGD.pdf - Manufacturer Part Number: WP710A10SGD **Pins:** - A [pin 2] - K [pin 1] ### U1 — [ADS1299IPAGR](https://www.flux.ai/adrian95/ads1299ipagr.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/lit/ds/symlink/ads1299.pdf - Manufacturer Name: Texas Instruments - Manufacturer Part Number: ADS1299IPAGR - Part Type: Integrated Circuit **Pins:** - ~CS [pin 39] - ~DRDY [pin 47] - ~PWDN [pin 35] - ~RESET [pin 36] - AVDD_1 [pin 19] - AVDD_2 [pin 22] - AVDD_3 [pin 23] - AVDD_4 [pin 56] - AVDD_5 [pin 59] - AVDD1 [pin 54] - AVSS_1 [pin 20] - AVSS_2 [pin 21] - AVSS_3 [pin 32] - AVSS_4 [pin 57] - AVSS_5 [pin 58] - AVSS1 [pin 53] - BIASIN [pin 62] - BIASINV [pin 61] - BIASOUT [pin 63] - BIASREF [pin 60] - CLK [pin 37] - CLKSEL [pin 52] - DAISY_IN [pin 41] - DGND_1 [pin 33] - DGND_2 [pin 49] - DGND_3 [pin 51] - DIN [pin 34] - DOUT [pin 43] - DVDD_1 [pin 48] - DVDD_2 [pin 50] - GPIO1 [pin 42] - GPIO2 [pin 44] - GPIO3 [pin 45] - GPIO4 [pin 46] - IN1N [pin 15] - IN1P [pin 16] - IN2N [pin 13] - IN2P [pin 14] - IN3N [pin 11] - IN3P [pin 12] - IN4N [pin 9] - IN4P [pin 10] - IN5N [pin 7] - IN5P [pin 8] - IN6N [pin 5] - IN6P [pin 6] - IN7N [pin 3] - IN7P [pin 4] - IN8N [pin 1] - IN8P [pin 2] - NC_1 [pin 27] - NC_2 [pin 29] - RESERVED [pin 64] - RESV1 [pin 31] - SCLK [pin 40] - SRB1 [pin 17] - SRB2 [pin 18] - START [pin 38] - VCAP1 [pin 28] - VCAP2 [pin 30] - VCAP3 [pin 55] - VCAP4 [pin 26] - VREFN [pin 25] - VREFP [pin 24] ### U2 — [TP4056X-42-ESOP8](https://www.flux.ai/lcsc/tp4056x-42-esop8.md) - JLCPCB Part Class: Extended Part - LCSC Part Number: C2763448 - Manufacturer Name: TOPPOWER(南京拓微) - Part Type: Battery Management ICs - Manufacturer Part Number: TP4056X-42-ESOP8 - Package or Case Code: SOP-8_L4.9-W3.9-P1.27-LS6.0-TL-EP **Pins:** - ~{CHRG} [pin 7] - ~{STDBY} [pin 6] - BAT [pin 5] - CE [pin 8] - EP [pin 9] - GND [pin 3] - PROG [pin 2] - TEMP [pin 1] - VCC [pin 4] ### U3 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1.md) - Manufacturer Part Number: AP2112K-3.3TRG1 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Name: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Datasheet URL: Diodes Incorporated - Role Details: 3.3V LDO regulator for device power rail - Role: Power Management **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U4 — [CH340C](https://www.flux.ai/vasy_skral/ch340c.md) - Part Type: Integrated Circuit - Manufacturer Part Number: CH340C - Manufacturer Name: Wah - Datasheet URL: https://datasheet.lcsc.com/szlcsc/Jiangsu-Qin-Heng-CH340C_C84681.pdf **Pins:** - ~CTS [pin 9] - ~DCD [pin 12] - ~DSR [pin 10] - ~DTR [pin 13] - ~RI [pin 11] - ~RTS [pin 14] - GND [pin 1] - NC [pin 7] - NC [pin 8] - R232 [pin 15] - RXD [pin 3] - TXD [pin 2] - UD- [pin 6] - UD+ [pin 5] - V3 [pin 4] - VCC [pin 16] ### U5 — [ESP32-WROOM-32D](https://www.flux.ai/vasyl/esp32-wroom-32d.md) - Manufacturer Name: Espressif Systems - Manufacturer Part Number: ESP32-WROOM-32D - License: https://creativecommons.org/licenses/by/4.0/ - Copper Planes: Layer 2: GND, Layer 3: 5V - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - Environment: Industrial (-40 °C to 85 °C, EMI class) - Stackup: Standard 4 Layer - Part Type: Microcontroller **Pins:** - 3.3V [pin 2] - AGND [pin 39] - CLK [pin 20] - CMD [pin 19] - EN [pin 3] - GND [pin 38] - GND [pin 15] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 32] - RXD0 [pin 34] - SD0 [pin 21] - SD1 [pin 22] - SD2 [pin 17] - SD3 [pin 18] - TXD0 [pin 35] - VN [pin 5] - VP [pin 4] ### U6 — [TPS61023DRLR](https://www.flux.ai/adrian95/tps61023drlr.md) - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps61023 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Part Number: TPS61023DRLR - Manufacturer Name: Texas Instruments **Pins:** - EN [pin 2] - FB [pin 1] - GND [pin 4] - SW [pin 5] - VIN [pin 3] - VOUT [pin 6] ### U7 — [TXB0108PWR](https://www.flux.ai/jecstronic/txb0108pwr.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/txb0108.pdf? - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Part Number: TXB0108PWR **Pins:** - A1 [pin 1] - A2 [pin 3] - A3 [pin 4] - A4 [pin 5] - A5 [pin 6] - A6 [pin 7] - A7 [pin 8] - A8 [pin 9] - B1 [pin 20] - B2 [pin 18] - B3 [pin 17] - B4 [pin 16] - B5 [pin 15] - B6 [pin 14] - B7 [pin 13] - B8 [pin 12] - GND [pin 11] - OE [pin 10] - VCCA [pin 2] - VCCB [pin 19] ### Y1 — [S3D2.048000A20F30T](https://www.flux.ai/lcsc/s3d2p048000a20f30t.md) - Part Type: Oscillators - LCSC Part Number: C387317 - Product Info Url: https://lcsc.com/product-detail/SMD-Oscillators-XO_Shenzhen-SCTF-Elec-S3D2-048000A20F30T_C387317.html - JLCPCB Part Class: Extended Part - Manufacturer Name: SCTF(星通时频) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2204281545_Shenzhen-SCTF-Elec-S3D2-048000A20F30T_C387317.pdf - Manufacturer Part Number: S3D2.048000A20F30T - Package or Case Code: OSC-SMD_4P-L3.2-W2.5-BL_SIT8008BI **Pins:** - GND [pin 2] - OUTPUT [pin 3] - Tri-state [pin 1] - VDD [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/brianbenchoff/hypnoeeg-v2-da15-4446](https://www.flux.ai/brianbenchoff/hypnoeeg-v2-da15-4446).* --- *Generated from [https://www.flux.ai/brianbenchoff/hypnoeeg-v2-da15-4446](https://www.flux.ai/brianbenchoff/hypnoeeg-v2-da15-4446)*