# \[Example\] ESP32 Reference Design

## Description

An example development and reference design for the ESP32 microcontroller\.

## Project Details

- **Owner:** rowsail
- **Created:** 9/12/2021
- **Last Updated:** 6/29/2023
- **Visibility:** Public

## Key Components

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### \+3V3 — Power Symbol

**Pins:**
- P1

### A0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### A1 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### A2 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### A3 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### A4 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### A5 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### A6 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### A7 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### AIN0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### AIN1 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### AIN2 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### AIN3 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B1 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B2 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B3 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B4 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B5 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B6 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### B7 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### D1 — [Schottky Diode](https://flux.ai/lwcassid/schottky-diode~zf.md)

- Series Resistance: 2\.8Ω
- Emission Coefficient: 2\.03
- Breakdown Voltage: 70V
- Saturation Current: 3\.15e\-7A

**Pins:**
- ANODE
- CATHODE

### DTS — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_CLK — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_CMD — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_EN — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_EN — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_EN — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO12 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO13 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO14 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO15 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO16 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO17 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO18 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO19 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO2 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO2 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO23 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO25 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO26 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO27 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO32 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO33 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO34 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO35 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO36 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO39 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO4 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO5 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_IO5 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_RX — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_RX — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_SD0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_SD1 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_SD2 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_SD3 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_TX — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_TX — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### ESP\_TX — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### J1 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J10 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J11 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J12 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J13 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J14 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J15 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J2 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J3 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J4 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J5 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J6 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J7 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J8 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### J9 — [Connector 01x04 Horizontal](https://flux.ai/jharwinbarrozo/connector-01x04-horizontal~h0.md)

- Part Type: Connector

**Pins:**
- PIN\_1 [pin 1]
- PIN\_2 [pin 2]
- PIN\_3 [pin 3]
- PIN\_4 [pin 4]

### PWM0 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM1 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM10 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM11 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM12 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM13 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM14 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM15 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM2 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM3 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM4 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM5 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM6 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM7 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM8 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### PWM9 — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### Q1 — S8050

- Manufacturer Name: ON Semiconductor
- Datasheet URL: https://www\.onsemi\.com/pub/Collateral/SS8050\-D\.pdf
- Manufacturer Part Number: S8050
- Part Type: Transistor

**Pins:**
- B [pin 2]
- C [pin 3]
- E [pin 1]

### Q2 — S8050

- Manufacturer Name: ON Semiconductor
- Datasheet URL: https://www\.onsemi\.com/pub/Collateral/SS8050\-D\.pdf
- Manufacturer Part Number: S8050
- Part Type: Transistor

**Pins:**
- B [pin 2]
- C [pin 3]
- E [pin 1]

### RST — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### S1 — [Push Button](https://flux.ai/jharwinbarrozo/push-button~eqk.md)

- Part Type: Switch
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1809271215\_Omron\-Electronics\-B3FS\-1050P\_C231326\.pdf
- Manufacturer Part Number: B3FS\-1050P
- Manufacturer Name: OMRON

**Pins:**
- P1 [pin 1]
- P2 [pin 3]

### S2 — [Push Button](https://flux.ai/jharwinbarrozo/push-button~eqk.md)

- Part Type: Switch
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1809271215\_Omron\-Electronics\-B3FS\-1050P\_C231326\.pdf
- Manufacturer Part Number: B3FS\-1050P
- Manufacturer Name: OMRON

**Pins:**
- P1 [pin 1]
- P2 [pin 3]

### SCL — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### SCL — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### SCL — Label

**Pins:**
- P1
- P2

### SCL — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### SDA — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### SDA — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### SDA — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### SDA — Label

- Pin Type: Signal

**Pins:**
- P1
- P2

### TP1 — [Test Point](https://flux.ai/ramprakashvishnoi8/test-point~w1.md)

**Pins:**
- P1

### TP2 — [Test Point](https://flux.ai/ramprakashvishnoi8/test-point~w1.md)

**Pins:**
- P1

### TP3 — [Test Point](https://flux.ai/ramprakashvishnoi8/test-point~w1.md)

**Pins:**
- P1

### TP4 — [Test Point](https://flux.ai/ramprakashvishnoi8/test-point~w1.md)

**Pins:**
- P1

### TP5 — [Test Point](https://flux.ai/ramprakashvishnoi8/test-point~w1.md)

**Pins:**
- P1

### TP6 — [Test Point](https://flux.ai/ramprakashvishnoi8/test-point~w1.md)

**Pins:**
- P1

### U1 — [ESP32\-WROOM\-32D](https://flux.ai/vasyl/esp32-wroom-32d~7py.md)

- Manufacturer Name: Espressif Systems
- Manufacturer Part Number: ESP32\-WROOM\-32
- Part Type: Microcontroller
- Datasheet URL: https://www\.espressif\.com/sites/default/files/documentation/esp32\-wroom\-32d\_esp32\-wroom\-32u\_datasheet\_en\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: ESP32\-WROOM\-32D        
- Package or Case Code: ESP32\-WROOM\-32

**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]

### U2 — MCP23017\-E/SO

- Datasheet URL: http://www\.microchip\.com/mymicrochip/filehandler\.aspx?ddocname=en023709
- Manufacturer Part Number: MCP23017\-E/SO
- Manufacturer Name: Microchip Technology
- Part Type: Integrated Circuit
- Package or Case Code: 28\-SOIC

**Pins:**
- \~RESET
- A0
- A1
- A2
- GPA0
- GPA1
- GPA2
- GPA3
- GPA4
- GPA5
- GPA6
- GPA7
- GPB0
- GPB1
- GPB2
- GPB3
- GPB4
- GPB5
- GPB6
- GPB7
- INTA
- INTB
- SCK
- SDA
- VDD
- VSS

### U3 — TPS564201DDCR

- Manufacturer Part Number: TPS564201DDCR
- Datasheet URL: http://www\.ti\.com/general/docs/suppproductinfo\.tsp?distId=10&gotoUrl=http%3A%2F%2Fwww\.ti\.com%2Flit%2Fgpn%2Ftps564201
- Part Type: Integrated Circuit
- Manufacturer Name: Texas Instruments
- Package or Case Code: TSOT\-23\-6

**Pins:**
- EN
- GND
- SW
- VBST
- VFB
- VIN

### U4 — USB4110\-GF\-A\_REVB

- Manufacturer Name: GCT
- Datasheet URL: https://gct\.co/files/drawings/usb4110\.pdf
- Part Type: Connector 
- Package or Case Code: Surface Mount, Right Angle
- Manufacturer Part Number: USB4110\-GF\-A

**Pins:**
- CC1
- CC2
- DN1
- DN2
- DP1
- DP2
- GND
- GND
- GND
- GND
- GND
- GND
- SBU1
- SBU2
- VBUS
- VBUS

### U5 — ADS1115IDGSR

- Datasheet URL: https://www\.ti\.com/general/docs/suppproductinfo\.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww\.ti\.com%2Flit%2Fgpn%2Fads1113
- Part Type: Integrated Circuit
- Manufacturer Name: Texas Instruments
- Package or Case Code: 10\-VSSOP
- Manufacturer Part Number: ADS1115IDGSR

**Pins:**
- ADDR
- AIN0
- AIN1
- AIN2
- AIN3
- ALERT/RDY
- GND
- SCL
- SDA
- VDD

### U6 — [CP2102N\-Axx\-xQFN28](https://flux.ai/vasyl/cp2102n-a02-gqfn28~xo8.md)

- Manufacturer Part Number: CP2102N\-Axx\-xQFN28
- Manufacturer Name: SILICON LABS
- Package or Case Code: CP2102N\-A02\-GQFN28
- Datasheet URL: https://www\.silabs\.com/documents/public/data\-sheets/cp2102n\-datasheet\.pdf
- Part Type: Integrated Circuit

**Pins:**
- \~CTS
- \~DCD
- \~DSR
- \~DTR
- \~RI\~/CLK
- \~RST
- \~RTS
- \~RXT\~/GPIO\.1
- \~SUSPEND
- \~TXT\~/GPIO\.0
- \~WAKEUP\~/GPIO\.3
- CHR0
- CHR1
- CHREN
- D\-
- D\+
- GND
- GND
- GPIO\.4
- GPIO\.5
- GPIO\.6
- NC
- RS485/GPIO\.2
- RXD
- SUSPEND
- TXD
- VBUS
- VDD
- VREGIN

### U7 — PCA9685PW,118 old

- Manufacturer Part Number: PCA9685PW,118
- Part Type: Integrated Circuit
- Manufacturer Name: NXP
- Datasheet URL: https://www\.nxp\.com/docs/en/data\-sheet/PCA9685\.pdf
- Manufacturer Part Number: PCA9685PW,118
- Manufacturer Name: NXP Semiconductors NV

**Pins:**
- \~OE
- A0
- A1
- A2
- A3
- A4
- A5
- EXTCLK
- LED0
- LED1
- LED10
- LED11
- LED12
- LED13
- LED14
- LED15
- LED2
- LED3
- LED4
- LED5
- LED6
- LED7
- LED8
- LED9
- SCL
- SDA
- VDD
- VSS

### USB\_D\- — Label

**Pins:**
- P1
- P2

### USB\_D\- — Label

**Pins:**
- P1
- P2

### USB\_D\- — Label

**Pins:**
- P1
- P2

### USB\_D\+ — Label

**Pins:**
- P1
- P2

### USB\_D\+ — Label

**Pins:**
- P1
- P2

### USB\_D\+ — Label

**Pins:**
- P1
- P2

### VIN — Power Symbol

**Pins:**
- P1

### VIN — Power Symbol

**Pins:**
- P1

### VIN — Power Symbol

**Pins:**
- P1

### VUSB — Power Symbol

**Pins:**
- P1

### VUSB — Power Symbol

**Pins:**
- P1

### VUSB — Power Symbol

**Pins:**
- P1

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/rowsail/example\-esp32\-reference\-design\~l5](https://flux.ai/rowsail/example-esp32-reference-design~l5).*

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*Generated from [https://flux\.ai/rowsail/example\-esp32\-reference\-design\~l5](https://flux.ai/rowsail/example-esp32-reference-design~l5)*