# Brainstorm a new project with AI [Example]
## Description
Smart Chair V1: ESP32-C3-based seat-occupancy and posture sensing hub with 4× FSR channels and IMU over I2C, featuring corrected USB-C power wiring with TVS protection, remapped I2C on IO4/IO5 with pull-ups, dedicated PROG_TX/PROG_RX/BOOT/EN test pads, and antenna keep-out zone #consumer-electronics #BLE #I2C #USB-C #IoT
## Project Details
- **Owner:** icaris
- **Created:** 11/30/2025
- **Last Updated:** 12/1/2025
- **Visibility:** Public
- **Board Size:** 80.0 mm × 60.0 mm
- **Manufacturing Quantity Target:** 25
- **Power Requirements:** USB
- **DRC Issues:** []
- **Domain:** Consumer Electronics
- **BOM (qty-100 LCSC):** Compiled BOM with LCSC pricing for 100 units
- **System Architecture:** graph LR
USB_C[USB-C Connector]
TVS[TVS Diode]
LDO[3.3V LDO Regulator]
ESP[ESP32-C3 MCU]
IMU[MPU-6050 IMU]
FSR[4× FSR Sensor Array]
I2C_Bus[I2C Bus]
J3[JST-PH 4-pin I2C Connector]
J2[JST-PH 6-pin FSR Connector]
R19[5.1kΩ Rd on CC1]
R20[5.1kΩ Rd on CC2]
GND[GND]
TestPads[Test Pads: PROG_TX/PROG_RX/BOOT/EN]
AntennaZone[Antenna Keep-Out Zone]
USB_C -->|VBUS| TVS --> LDO -->|3.3V| ESP
USB_C -->|CC1| R19 --> GND
USB_C -->|CC2| R20 --> GND
ESP -->|I2C| I2C_Bus
I2C_Bus --> IMU
I2C_Bus --> J3
ESP -->|FSR| FSR --> J2
ESP --> TestPads
AntennaZone -.-> ESP
- **Power Source:** USB-C 5V from host
- **Target Use Case:** Seat-occupancy, posture, and movement sensing hub for smart chairs
- **Primary MCU:** Espressif ESP32-C3-WROOM-02-N4 / -02U-N4
- **Human Interface:** Buttons
- **Sensor Suite:** 4x FSR channels via analog dividers + MPU-6050 IMU over I2C
- **License:** https://creativecommons.org/licenses/by/4.0/
- **Radio Interfaces:** BLE, WiFi 2.4 GHz (on-module antenna or U.FL option)
- **Software:** Arduino
- **ERC Issues:** <paste full JSON blob or text output returned by @review here>
- **Operating Voltage:** 3.3V
- **Project Name:** Smart Chair V1 – ESP32-C3 Sensor & FSR Hub Board
- **GPIO Pin Map:** Draft ESP32-C3-WROOM-02(-U) GPIO assignment (updated):
Power / Reset / Boot
- EN (CHIP_EN):
- Function: Manual reset input (active high enable)
- Net: EN
- External: Connected to SW1 (momentary reset button), TP_EN test pad, and pull-up to 3V3 per ESP32-C3 ref design
- IO0:
- Function: PROG_BOOT / strapping pin
- Net: PROG_BOOT
- Use: BOOT0 for entering UART download mode when held low during reset
- External: Connected to TP_BOOT test pad and weak pull-up R21 to 3V3
- Notes: Do not heavily load; only use for boot/flash circuitry and optional weak pull-ups/downs
UART Programming Interface
- IO20 (RXD):
- Signal: PROG_RX
- Net: PROG_RX
- Function: UART0 RX for programming/logging
- External: Routed to TP_PROG_RX test pad (off-board USB-UART bridge)
- IO21 (TXD):
- Signal: PROG_TX
- Net: PROG_TX
- Function: UART0 TX for programming/logging
- External: Routed to TP_PROG_TX test pad (off-board USB-UART bridge)
I2C Bus (IMU + External I2C Connector J3)
- IO4 (GPIO4):
- Signal: SCL
- Net: SCL
- Function: I2C SCL (MPU-6050 U3 + JST-PH I2C connector J3 pin 1)
- External: Pulled up to 3V3 via R1/R22 located near U1
- IO5 (GPIO5):
- Signal: SDA
- Net: SDA
- Function: I2C SDA (MPU-6050 U3 + JST-PH I2C connector J3 pin 2)
- External: Pulled up to 3V3 via R2/R23 located near U1
FSR Analog Inputs (from 6-pin JST-PH FSR Harness J2)
- IO1 (ADC1_CH1) – FSR1:
- Net: FSR1
- Function: Analog input for FSR channel 1
- External: J2 Pin_3 via resistor network R13/R7 and C6
- IO4/IO5 no longer used as analog inputs (dedicated to I2C)
- IO6 (ADC1_CH6) – FSR4 / LED_PWR (current rev):
- Net: FSR4 / LED_PWR shared
- Function: Analog input for FSR channel 4 and drive for power LED (through R17)
- Notes: Shared analog/digital usage; to be separated in next revision
- IO7 – LED_STATUS:
- Net: LED_STATUS
- Function: Status LED D3 (through R18)
Other Boot/Strap Pins (Reserved / Not Used for External Connectors)
- IO2:
- Bootstrapped; kept on-board only with simple pulls as per Espressif guidelines; not exported to connectors
USB-C / Power Path
- J1: 124018312112A USB-C receptacle
- VBUS_A/VBUS_B:
- Function: 5V input from host
- Net: VBUS
- Path: J1 VBUS pins → TVS D4 (PRTR5V0U2X,215) VCC/GND → U4 NCP176 IN → 3V3 rail
- CC1/CC2:
- Nets: CC1, CC2
- Function: USB-C attach detection (power sink)
- External: Each tied to GND via 5.1 kΩ Rd resistors R19 (CC1) and R20 (CC2)
- D+/D-:
- Nets: D1+/D1-, D2+/D2-
- Function: ESD-protected only via D1 (SMF05C.TCT); not connected to ESP32 USB
Power / Ground
- 3V3:
- Net: 3V3
- Source: U4 NCP176BMX330TCG regulator (from USB VBUS)
- Sinks: U1/U2 3V3, I2C pull-ups (R1/R2/R22/R23), LED resistors (R17/R18), FSR divider top nodes, IMU U3 supply and decoupling, etc.
- GND:
- Net: GND
- Common reference for ESP32, IMU, USB-C shield/grounds, FSR dividers, LEDs, and TVS diodes
Programming Test Access
- PROG_TX: TP_PROG_TX net portal tied to U1:TXD
- PROG_RX: TP_PROG_RX net portal tied to U1:RXD
- BOOT: TP_BOOT net portal tied to U1:IO0 (PROG_BOOT net)
- EN: TP_EN net portal tied to U1:EN (EN net)
Antenna Keep-Out (ESP32-C3-WROOM-02/02U)
- Requirement (schematic note only in this rev):
- Keep copper, vias, components, and high-profile objects out of the antenna region defined in the ESP32-C3-WROOM-02/-02U datasheet (typically the antenna end of the module plus a clearance region extending off-board edge).
- Place ESP32-C3 module at PCB edge with antenna end extending beyond or flush with board outline.
- Mark keep-out on silkscreen and mechanical layers in layout (to be implemented during PCB layout).
USB-C Power-Only Mode Summary
- Port Type: USB-C sink, power-only
- CC1/CC2: 5.1 kΩ Rd to GND (R19/R20)
- VBUS: Routed only to TVS D4 and LDO U4 IN, not shorted to GND
- Data Lines: Protected by D1 but not connected to ESP32.
ERC / DRC Tracking
- ERC Issues: See latest @review output (all critical errors resolved for USB-C, I2C remap, EN/BOOT/test pads, and IMU strapping)
- DRC Issues: []
Board and Manufacturing
- Board Size: 80.0 mm × 60.0 mm
- Power Requirements: USB
- Power Source: USB-C 5V from host
- Manufacturing Quantity Target: 100
- BOM (qty-100 LCSC: Compiled BOM with LCSC pricing for 100 units
- **External Interfaces:** USB-C for power only; 4-pin JST-PH I2C; 6-pin JST-PH FSR harness
- **Connectivity:** WiFi
- **Part Type:** Interface
## Key Components
### D1 — [SMF05C.TCT](https://www.flux.ai/adrian95/smf05cptct~ybt.md)
- Manufacturer Name: Semtech Corporation
- Package or Case Code: D_SOT-23
- Mount: Surface Mount
- Datasheet URL: https://www.verical.com/datasheet/semtech-international-esd-supressors-SMF05C-TCT-89007.pdf
- License: https://creativecommons.org/licenses/by/4.0/
- Diode Type: Zener
- Availability: In Stock
- Manufacturer Part Number: SMF05C.TCT
- Part Type: Protection
**Pins:**
- CATHODE_1 [pin 1]
- CATHODE_2 [pin 3]
- CATHODE_3 [pin 4]
- CATHODE_4 [pin 5]
- CATHODE_5 [pin 6]
- COMMON_ANODE [pin 2]
### D1 — [SMF05C.TCT](https://www.flux.ai/adrian95/smf05cptct~ybt.md)
- Manufacturer Name: Semtech Corporation
- License: https://creativecommons.org/licenses/by/4.0/
- Part Type: TVS Diode
- Manufacturer Part Number: SMF05C.TCT
- Role Details: ESD array for USB-C data lines
- Datasheet URL: https://www.verical.com/datasheet/semtech-international-esd-supressors-SMF05C-TCT-89007.pdf
- Role: Protection
**Pins:**
- CATHODE_1 [pin 1]
- CATHODE_2 [pin 3]
- CATHODE_3 [pin 4]
- CATHODE_4 [pin 5]
- CATHODE_5 [pin 6]
- COMMON_ANODE [pin 2]
### D2 — [KPT-1608SURCK](https://www.flux.ai/adrian95/kpt-1608surck~dsz.md)
- Mount: Surface Mount
- Diode Type: LED
- Datasheet URL: https://www.kingbright.com/attachments/file/psearch/000/00/20160808bak/KPT-1608SURCK(Ver.22A).pdf
- Part Type: LED
- Availability: In Stock
- Manufacturer Name: Kingbright
- License: https://creativecommons.org/licenses/by/4.0/
- Manufacturer Part Number: KPT-1608SURCK
- Package or Case Code: LED-TH
**Pins:**
- A [pin 2]
- K [pin 1]
### D2 — [LED 0603 (1608 Metric)](https://www.flux.ai/jharwinbarrozo/led-0603-1608-metric~yk.md)
- Role Details: Power indicator LED
- Role: Indicator
- Part Type: LED
**Pins:**
- A [pin 2]
- K [pin 1]
### D3 — [KPT-1608SURCK](https://www.flux.ai/adrian95/kpt-1608surck~dsz.md)
- License: https://creativecommons.org/licenses/by/4.0/
- Diode Type: LED
- Manufacturer Part Number: KPT-1608SURCK
- Datasheet URL: https://www.kingbright.com/attachments/file/psearch/000/00/20160808bak/KPT-1608SURCK(Ver.22A).pdf
- Mount: Surface Mount
- Manufacturer Name: Kingbright
- Package or Case Code: LED-TH
- Availability: In Stock
- Part Type: LED
**Pins:**
- A [pin 2]
- K [pin 1]
### D3 — [LED 0603 (1608 Metric)](https://www.flux.ai/jharwinbarrozo/led-0603-1608-metric~yk.md)
- Part Type: LED
- Role: Indicator
- Role Details: BLE status indicator LED
**Pins:**
- A [pin 2]
- K [pin 1]
### D4 — [PRTR5V0U2X,215](https://www.flux.ai/openpartlist/prtr5v0u2xc215~f8.md)
- Part Type: Protection
- Diode Type: Zener
- Manufacturer Part Number: PRTR5V0U2X,215
- Package or Case Code: D_SOT-23
- License: https://creativecommons.org/licenses/by/4.0/
- Mount: Surface Mount
- Role Details: TVS diode for USB VBUS
- Manufacturer Name: Nexperia USA Inc.
- Role: Protection
- Datasheet URL: https://assets.nexperia.com/documents/data-sheet/PRTR5V0U2X.pdf
- Availability: In Stock
**Pins:**
- GND [pin 1]
- I/O1 [pin 2]
- I/O2 [pin 3]
- VCC [pin 4]
### D4 — [PRTR5V0U2X,215](https://www.flux.ai/openpartlist/prtr5v0u2xc215~f8.md)
- Manufacturer Name: Nexperia USA Inc.
- Datasheet URL: https://assets.nexperia.com/documents/data-sheet/PRTR5V0U2X.pdf
- License: https://creativecommons.org/licenses/by/4.0/
- Part Type: Protection
- Manufacturer Part Number: PRTR5V0U2X,215
**Pins:**
- GND [pin 1]
- I/O1 [pin 2]
- I/O2 [pin 3]
- VCC [pin 4]
### J1 — [2024100002](https://www.flux.ai/adrian95/2024100002~atk.md)
- Mount: Surface Mount
- Manufacturer Name: Molex
- Connector Type: USB Connectors
- Connector Gender: Receptacle
- License: https://creativecommons.org/licenses/by/4.0/
- Availability: In Stock
- Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/834/202410002_Pkg_Spec.pdf
- Package or Case Code: USB-C-receptacle
- Part Type: USB C
- Manufacturer Part Number: 2024100002
**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- DA- [pin A7]
- DA+ [pin A6]
- DB- [pin B7]
- DB+ [pin B6]
- GND1 [pin A1]
- GND2 [pin A12]
- GND3 [pin B1]
- GND4 [pin B12]
- RX1- [pin B10]
- RX1+ [pin B11]
- RX2- [pin A10]
- RX2+ [pin A11]
- SBU1 [pin A8]
- SBU2 [pin B8]
- SHIELD1 [pin SH1]
- SHIELD2 [pin SH2]
- SHIELD3 [pin SH3]
- SHIELD4 [pin SH4]
- TX1- [pin A3]
- TX1+ [pin A2]
- TX2- [pin B3]
- TX2+ [pin B2]
- VBUS1 [pin A4]
- VBUS2 [pin A9]
- VBUS3 [pin B4]
- VBUS4 [pin B9]
### J1 — [124018312112A](https://www.flux.ai/adrian95/124018312112a~dea.md)
- Manufacturer Part Number: 124018312112A
- Datasheet URL: https://cdn.amphenol-cs.com/media/wysiwyg/files/documentation/datasheet/inputoutput/io_waterproof_usb_type_c.pdf
- Role Details: USB-C power input receptacle
- Part Type: Connector
- Manufacturer Name: Amphenol ICC (Commercial Products)
- Role: Connector
- License: https://creativecommons.org/licenses/by/4.0/
**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- D1- [pin A7]
- D1+ [pin A6]
- D2- [pin B7]
- D2+ [pin B6]
- GND_A [pin A1]
- GND_A [pin A12]
- GND_B [pin B1]
- GND_B [pin B12]
- RX1- [pin B10]
- RX1+ [pin B11]
- RX2- [pin A10]
- RX2+ [pin A11]
- SBU1 [pin A8]
- SBU2 [pin B8]
- SHIELD [pin SH2]
- SHIELD [pin SH4]
- SHIELD [pin SH1]
- SHIELD [pin SH3]
- TX1- [pin A3]
- TX1+ [pin A2]
- TX2- [pin B3]
- TX2+ [pin B2]
- VBUS_A [pin A4]
- VBUS_A [pin A9]
- VBUS_B [pin B4]
- VBUS_B [pin B9]
### J2 — [B6B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/b6b-ph-k-slfsn~nsa.md)
- Connector Positions: 6
- Connector Type: Board to Wire
- Manufacturer Name: JST
- Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf
- Mount: Through Hole
- Availability: In Stock
- Connector Rows: 1
- License: https://creativecommons.org/licenses/by/4.0/
- LCSC Part Number: C2263334
- Connector Pitch: 2mm
- Manufacturer Part Number: B6B-PH-K-S(LF)(SN)
- Part Type: Connector
**Pins:**
- Pin_1 [pin 1]
- Pin_2 [pin 2]
- Pin_3 [pin 3]
- Pin_4 [pin 4]
- Pin_5 [pin 5]
- Pin_6 [pin 6]
### J2 — [B6B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/b6b-ph-k-slfsn~nsa.md)
- Part Type: Connector
- Manufacturer Name: JST Sales America Inc.
- Role: Connector
- Role Details: 6-pin JST-PH connector for FSR harness
- Manufacturer Part Number: B6B-PH-K-S(LF)(SN)
- Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf
- License: https://creativecommons.org/licenses/by/4.0/
**Pins:**
- Pin_1 [pin 1]
- Pin_2 [pin 2]
- Pin_3 [pin 3]
- Pin_4 [pin 4]
- Pin_5 [pin 5]
- Pin_6 [pin 6]
### J3 — [B4B-PH-K-S(LF)(SN)](https://www.flux.ai/lcsc/b4b-ph-k-slfsn~0ffw.md)
- Connector Rows: 1
- Manufacturer Name: JST
- Connector Pitch: 2mm
- Connector Type: Board to Wire
- LCSC Part Number: C131334
- Connector Positions: 4
- Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B4B-PH-K-S-LF-SN_C131334.pdf
- Availability: In Stock
- Part Type: Connector
- Manufacturer Part Number: B4B-PH-K-S(LF)(SN)
- Package or Case Code: CONN-TH_B4B-PH-K-S
- JLCPCB Part Class: Extended Part
- Mount: Through Hole
- Product Info Url: https://lcsc.com/product-detail/PH-Connectors_JST_B4B-PH-K-S-LF-SN_B4B-PH-K-S-LF-SN_C131334.html
- Connector Gender: Female
**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
### J3 — [B4B-PH-K-S(LF)(SN)](https://www.flux.ai/lcsc/b4b-ph-k-slfsn~0ffw.md)
- Connector Gender: Female
- Pin 1 Pin Role: SCL
- Bus Type: I2C
- Role: Connector
- JLCPCB Part Class: Extended Part
- Product Info Url: https://lcsc.com/product-detail/PH-Connectors_JST_B4B-PH-K-S-LF-SN_B4B-PH-K-S-LF-SN_C131334.html
- Role Details: 4-pin JST-PH connector for I2C harness
- Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B4B-PH-K-S-LF-SN_C131334.pdf
- Connector Positions: 4
- Pin 2 Pin Role: SDA
- Part Type: Connector
- Manufacturer Part Number: B4B-PH-K-S(LF)(SN)
- Package or Case Code: CONN-TH_B4B-PH-K-S
- Connector Rows: 1
- Manufacturer Name: JST
- Connector Pitch: 2mm
- Connector Type: Headers and Wire Housings
- LCSC Part Number: C131334
**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
### SW1 — [3-1825910-5](https://www.flux.ai/vasy_skral/3-1825910-5~1i0.md)
- Role Details: Reset push-button for part U1, pin EN
- Part Type: Switch
- Availability: In Stock
- License: https://creativecommons.org/licenses/by/4.0/
- Manufacturer Part Number: 3-1825910-5
- Role: Switch
- LCSC Part Number: C171381
- Manufacturer Name: TE Connectivity ALCOSWITCH Switches
- Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1825910&DocType=Customer+Drawing&DocLang=English
**Pins:**
- 1-1 [pin 1-1]
- 1-2 [pin 1-2]
- 2-1 [pin 2-1]
- 2-2 [pin 2-2]
### SW1 — [SW_Push](https://www.flux.ai/adrian95/swpush~f5x.md)
- Manufacturer Name: Schurter Inc.
- Datasheet URL: https://us.schurter.com/en/datasheet/typ_6x6_mm_tact_switches.pdf
- Manufacturer Part Number: 1301.9314
- Role Details: Reset push-button for part U1, pin EN
- Part Type: Switch
- Role: Switch
**Pins:**
- 1
- 2
### U1 — [ESP32-C3-WROOM-02-N4](https://www.flux.ai/vasy_skral/esp32-c3-wroom-02-n4~tqi.md)
- Manufacturer Name: Espressif Systems
- Role Details: Primary MCU module
- Pin Role (IO4): SCL
- Pin Role (IO5): SDA
- Part Type: Module
- Symbol Style: Parametric
- License: https://creativecommons.org/licenses/by/4.0/
- Availability: In Stock
- Manufacturer Part Number: ESP32-C3-WROOM-02-N4
- Role: Main MCU
- Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf
**Pins:**
- 3V3 [pin 1]
- EN [pin 2]
- GND [pin 38]
- GND [pin 32]
- GND [pin 37]
- GND [pin 22]
- GND [pin 19]
- GND [pin 34]
- GND [pin 31]
- GND [pin 21]
- GND [pin 39]
- GND [pin 36]
- GND [pin 9]
- GND [pin 25]
- GND [pin 33]
- GND [pin 29]
- GND [pin 30]
- GND [pin 28]
- GND [pin 20]
- GND [pin 35]
- GND [pin 26]
- GND [pin 24]
- GND [pin 23]
- GND [pin 27]
- IO0 [pin 18]
- IO1 [pin 17]
- IO10 [pin 10]
- IO18 [pin 13]
- IO19 [pin 14]
- IO2 [pin 16]
- IO3 [pin 15]
- IO4 [pin 3]
- IO5 [pin 4]
- IO6 [pin 5]
- IO7 [pin 6]
- IO8 [pin 7]
- IO9 [pin 8]
- RXD [pin 11]
- TXD [pin 12]
### U2 — [ESP32-C3-WROOM-02U-N4](https://www.flux.ai/lcsc/esp32-c3-wroom-02u-n4~9sql.md)
- Manufacturer Name: ESPRESSIF(乐鑫)
- Package or Case Code: WIFI-SMD_L18.0-W14.3_ESP32-C3-WROOM-02U-N4
- Role Details: Fallback MCU module
- LCSC Part Number: C2926676
- Manufacturer Part Number: ESP32-C3-WROOM-02U-N4
- JLCPCB Part Class: Extended Part
- Availability: In Stock
- Role: Main MCU
**Pins:**
- 3V3 [pin 1]
- EN [pin 2]
- GND [pin 9]
- GND [pin 19]
- GND [pin 20]
- GND [pin 21]
- GND [pin 22]
- GND [pin 23]
- GND [pin 24]
- GND [pin 25]
- GND [pin 26]
- GND [pin 27]
- IO0 [pin 18]
- IO1 [pin 17]
- IO10 [pin 10]
- IO18 [pin 13]
- IO19 [pin 14]
- IO2 [pin 16]
- IO3 [pin 15]
- IO4 [pin 3]
- IO5 [pin 4]
- IO6 [pin 5]
- IO7 [pin 6]
- IO8 [pin 7]
- IO9 [pin 8]
- RXD [pin 11]
- TXD [pin 12]
### U3 — [MPU-6050](https://www.flux.ai/hayschan/mpu-6050~8f.md)
- Role Details: Inertial Measurement Unit (I2C)
- Datasheet URL: https://product.tdk.com/system/files/dam/doc/product/sensor/mortion-inertial/imu/data_sheet/mpu-6000-datasheet1.pdf
- Role: Sensor
- Availability: In Stock
- Manufacturer Part Number: MPU-6050
- Manufacturer Name: TDK
**Pins:**
- AD0 [pin 9]
- AUX_CL [pin 7]
- AUX_DA [pin 6]
- CLKIN [pin 1]
- CPOUT [pin 20]
- EP [pin 25]
- FSYNC [pin 11]
- GND [pin 18]
- INT [pin 12]
- NC_1 [pin 2]
- NC_2 [pin 3]
- NC_3 [pin 4]
- NC_4 [pin 5]
- NC_5 [pin 14]
- NC_6 [pin 15]
- NC_7 [pin 16]
- NC_8 [pin 17]
- REGOUT [pin 10]
- RESV_1 [pin 19]
- RESV_2 [pin 21]
- RESV_3 [pin 22]
- SCL [pin 23]
- SDA [pin 24]
- VDD [pin 13]
- VLOGIC [pin 8]
### U4 — [NCP176BMX330TCG](https://www.flux.ai/lcsc/ncp176bmx330tcg~6dhg.md)
- JLCPCB Part Class: Extended Part
- Package or Case Code: XDFN-6_L1.2-W1.2-P0.40-BL-EP
- Availability: In Stock
- Manufacturer Part Number: NCP176BMX330TCG
- Manufacturer Name: onsemi(安森美)
- Role Details: 3.3V LDO regulator for ESP32-C3 power rail
- Role: Power Conversion
- LCSC Part Number: C892272
**Pins:**
- EN [pin 4]
- EP [pin 7]
- FB [pin 2]
- GND [pin 3]
- IN [pin 6]
- N/C [pin 5]
- OUT [pin 1]
*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/icaris/brainstorm-a-new-project-with-ai-example~7t](https://www.flux.ai/icaris/brainstorm-a-new-project-with-ai-example~7t).*
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*Generated from [https://www.flux.ai/icaris/brainstorm-a-new-project-with-ai-example~7t](https://www.flux.ai/icaris/brainstorm-a-new-project-with-ai-example~7t)*