# esp32 board ## Description ESP32 DevKitC-32 Carrier PCB (No Grove, No Battery LED Bargraph, No Button) ## Project Details - **Owner:** critterhome86 - **Created:** 3/10/2026 - **Last Updated:** 3/10/2026 - **Visibility:** Public - **System Architecture:** flowchart TD USB_C["USB-C 5V Input"] --> PD["Type-C CC Sink"] USB_C --> CHG["Li-ion Charger with Power-Path"] BAT["18650 Battery Pads"] --> CHG CHG --> VSYS["System Rail VSYS"] VSYS --> REG33["3.3V Rail (ESP32 + sensors)"] VSYS --> BST5["5V Rail (sensor pad + audio amp)"] REG33 --> ESP32["ESP32 DevKitC-32 Socket (2x 1x19)"] ESP32 --> BRK["Labeled Breakout Solder Pads"] ESP32 --> MIC["TRS Mic Jack -> Bias/Filter -> ADC1"] ESP32 --> AMP["Audio Path -> Class-D Amp -> 3.5mm Speaker Jack"] REG33 --> PAD33["3.3V Sensor Power Pads"] BST5 --> PAD5["5V Sensor Power Pads"] VSYS --> GND["Common Ground"] CHG --> GND ## Key Components ### IC1 — [TPS62177DQCT](https://www.flux.ai/adrian95/tps62177dqct.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package: WSON-10 - Package or Case Code: SON50P200X300X80-11N - Part Type: Integrated Circuit - Role: Regulator - Role Details: 3.3V buck regulator from VSYS to +3V3 rail (>=500mA) - Manufacturer Part Number: TPS62177DQCT - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps62177 - Manufacturer Name: Texas Instruments **Pins:** - AGND [pin 6] - EN [pin 3] - EP [pin 11] - FB [pin 5] - NC [pin 4] - PG [pin 7] - PGND [pin 1] - SLEEP [pin 8] - SW [pin 9] - VIN [pin 2] - VOS [pin 10] ### IC2 — [MAX98357AETE+T](https://www.flux.ai/adrian95/max98357aeteplust.md) - Manufacturer Name: Analog Devices Inc./Maxim Integrated - Role Details: I2S mono class-D amp (digital in) for speaker output to 3.5mm jack - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/max98357a-max98357b.pdf - Manufacturer Part Number: MAX98357AETE+T - Role: Audio Amplifier - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Package: TQFN-16 **Pins:** - ~SD_MODE [pin 4] - BCLK [pin 16] - DIN [pin 1] - GAIN_SLOT [pin 2] - GND_1 [pin 3] - GND_2 [pin 11] - GND_3 [pin 15] - LRCLK [pin 14] - N.C._1 [pin 5] - N.C._2 [pin 6] - N.C._3 [pin 12] - N.C._4 [pin 13] - OUTN [pin 10] - OUTP [pin 9] - THERMAL_PAD [pin 17] - VDD_1 [pin 7] - VDD_2 [pin 8] ### J1 — [Pin Socket 01x19 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x19-254mm-vertical.md) - Part Type: Connector - Role Details: ESP32 DevKitC-32 carrier socket row; use two parts for 38-pin socket - Role: Connector - Package: Through Hole - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_16 [pin 16] - Pin_17 [pin 17] - Pin_18 [pin 18] - Pin_19 [pin 19] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### J2 — [Pin Socket 01x19 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x19-254mm-vertical.md) - Part Type: Connector - Role Details: ESP32 DevKitC-32 carrier socket row; use two parts for 38-pin socket - Role: Connector - Package: Through Hole - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_16 [pin 16] - Pin_17 [pin 17] - Pin_18 [pin 18] - Pin_19 [pin 19] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### J3 — [SJ1-3533NG](https://www.flux.ai/vasy_skral/sj1-3533ng.md) - Manufacturer Name: CUI Devices - Part Type: Connector - Datasheet URL: https://www.cuidevices.com/product/resource/sj1-353xng.pdf - Role: Connector - Manufacturer Part Number: SJ1-3533NG - Role Details: 3.5mm TRS jack (one used for speaker, one for microphone) - Package: Through Hole Right Angle **Pins:** - R [pin 3] - S [pin 1] - T [pin 2] ### J4 — [SJ1-3533NG](https://www.flux.ai/vasy_skral/sj1-3533ng.md) - Role Details: 3.5mm TRS jack (one used for speaker, one for microphone) - Role: Connector - Part Type: Connector - Datasheet URL: https://www.cuidevices.com/product/resource/sj1-353xng.pdf - Manufacturer Part Number: SJ1-3533NG - Manufacturer Name: CUI Devices - Package: Through Hole Right Angle **Pins:** - R [pin 3] - S [pin 1] - T [pin 2] ### J5 — [Type-C-2.0-6Pin](https://www.flux.ai/jharwinbarrozo/type-c-20-6pin.md) - Package: USB-C Receptacle - Manufacturer Name: CIKI - Datasheet URL: https://datasheet.lcsc.com/lcsc/2204071830_CIKI-Type-C-2-0-6Pin_C2987385.pdf - Role Details: USB-C power input (5V sink), CC resistors to be added - Role: Connector - Manufacturer Part Number: Type-C-2.0-6Pin - Part Type: Connector **Pins:** - CC1 - CC2 - GND - GND__1 - SHIELD - SHIELD__1 - SHIELD__2 - SHIELD__3 - V-BUS - V-BUS__1 ### J6 — [TerminalBlock-01x02P-5.00mm](https://www.flux.ai/vasy_skral/terminalblock-01x02p-500mm.md) - Role: Connector - Package: Through Hole - Part Type: Connector - Role Details: Battery connection terminal block / wire pads for 18650 holder leads **Pins:** - P1 [pin 2] - P2 [pin 1] ### J7 — [TerminalBlock-01x02P-5.00mm](https://www.flux.ai/vasy_skral/terminalblock-01x02p-500mm.md) - Part Type: Connector - Package: Through Hole - Role: Connector - Role Details: Sensor power output terminal blocks (one for +3V3/GND, one for +5V/GND) **Pins:** - P1 [pin 2] - P2 [pin 1] ### J8 — [TerminalBlock-01x02P-5.00mm](https://www.flux.ai/vasy_skral/terminalblock-01x02p-500mm.md) - Role: Connector - Part Type: Connector - Role Details: Sensor power output terminal blocks (one for +3V3/GND, one for +5V/GND) - Package: Through Hole **Pins:** - P1 [pin 2] - P2 [pin 1] ### Q1 — [FS8205A](https://www.flux.ai/lcsc/fs8205a.md) - Manufacturer Name: TECH PUBLIC(台舟) - Part Type: MOSFETs - Package: SOT-23-6 - Role Details: Dual MOSFET used with DW01A for battery protection cutoff - Role: Protection - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR - JLCPCB Part Class: Extended Part - Manufacturer Part Number: FS8205A - LCSC Part Number: C2830320 **Pins:** - D1/D2 [pin 5] - D1/D2 [pin 2] - G1 [pin 6] - G2 [pin 4] - S1 [pin 1] - S2 [pin 3] ### U1 — [MCP73871-2CCI/ML](https://www.flux.ai/adrian95/mcp73871-2cciml.md) - Part Type: Integrated Circuit - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP73871-Data-Sheet-20002090E.pdf - Manufacturer Part Number: MCP73871-2CCI/ML - Package: QFN-20 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Power Management - Role Details: Li-ion charger + power-path for USB 5V input and 1-cell 18650 battery - Manufacturer Name: Microchip Technology **Pins:** - ~PG [pin 6] - ~TE [pin 9] - CE [pin 17] - EP [pin 21] - IN_1 [pin 18] - IN_2 [pin 19] - OUT_1 [pin 1] - OUT_2 [pin 20] - PROG1 [pin 13] - PROG2 [pin 4] - PROG3 [pin 12] - SEL [pin 3] - STAT1/~LBO [pin 8] - STAT2 [pin 7] - THERM [pin 5] - VBAT_1 [pin 14] - VBAT_2 [pin 15] - VBAT_SENSE [pin 16] - VPCC [pin 2] - VSS_1 [pin 10] - VSS_2 [pin 11] ### U2 — [DW01A](https://www.flux.ai/kicad-part-library/dw01a.md) - Package: SOT-23-6 - Package or Case Code: SOT-23-6 - Role Details: 1-cell Li-ion protection controller (pairs with dual MOSFET) - Role: Protection - Datasheet URL: https://hmsemi.com/downfile/DW01A.PDF - Manufacturer Part Number: DW01A - Manufacturer Name: Texas Instruments Inc. **Pins:** - CS [pin 2] - GND [pin 6] - OC [pin 3] - OD [pin 1] - TD [pin 4] - VCC [pin 5] ### U3 — [TPS61200DRC](https://www.flux.ai/kicad-part-library/tps61200drc.md) - Manufacturer Name: Texas Instruments Inc. - Role: Regulator - Datasheet URL: http://www.ti.com/lit/ds/symlink/tps61200.pdf - Manufacturer Part Number: TPS61200DRC - Package: VSON-10 - Role Details: 5V boost regulator from VSYS to +5V rail (sensor pads + audio amp) - Package or Case Code: Texas_S-PVSON-N10_ThermalVias **Pins:** - EN [pin 6] - FB [pin 10] - GND [pin 9] - L [pin 3] - PAD [pin 11] - PGND [pin 4] - PS [pin 8] - UVLO [pin 7] - VAUX [pin 1] - VIN [pin 5] - VOUT [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/critterhome86/esp32-board](https://www.flux.ai/critterhome86/esp32-board).* --- *Generated from [https://www.flux.ai/critterhome86/esp32-board](https://www.flux.ai/critterhome86/esp32-board)*