ESP32-I2C-HUB

Feature

• ESP32 breakout board
  • Requires specific version of ESP32 board
• GVS (Ground, Voltage, Signal) for all ESP32 pins
• 4-channel I2C Hub
  • TCA9544 - 4-Channel I2C and SMBus Multiplexer With Interrupt Logic
  • Isolated I2C channels
  • Interrupt for each I2C channel
  • I2C Channels can be independently powered with 3.3V or 5V
  • Jumper selectable I2C base address
• GVS (Ground, Voltage, Signal) for all ESP32 pins
• FTDI header
• SPI bus header
• 5V power source selection/distribution
  • 5V sources - USB, 5mm terminal block, DC jack
• On-board 3.3V power regulator (doesn't stress the ESP32 regulator)
• 95x95mm ODAS form factor
• 6-32 mounting holes

ESP-32 Module

Schematic

• ESP32-I2C-HUB Schematic
• Esp32 DevKit v1

Connectors

H1 - 3.3V from on-board regulator Header

• Install jumper
• Alternate for 3.3V power is to install S to V jumper at 3.3V header position (bottom right)
  • H1 should not be installed for that case

H2 - 5V Selection Header

• Only should have 1 jumper installed
  • FTDI supplies 5V
  • 5V DC Jack or 5 mm terminal block supplies 5V
  • USB on ESP32 supplies 5V

J3 - I2C Address Select Jumpers

• A0-A2

J7 - I2C Interface

• Also goes to the I2C Hub chip

1. GND
2. VCC
3. SDA
4. SCL
5. INT*

J4, J5, J6, J8 - I2C Power Select (Ports #0-#3)

• Selects 3.3V or 5V on I2C
• 1-2 = 3.3V
• 2-3 = 5V

J9, J10, J11, J12 - I2C interfaces #0-#3

1. GND
2. VCC
3. SDA
4. SCL
5. INT*

P1 - 5V Power

• 2x8 pin header

P8 - SPIbus connector

1. MISO
2. 3.3V
3. SCK
4. MOSI
5. n/c
6. GND

Left GVS connector

1. EN
2. VP
3. VN
4. P34
5. P35
6. P32
7. P33
8. P25
9. P26
10. SCL
11. P14
12. P12
13. P13
14. VUSB

Right GVS connector

1. P23
2. SCL
3. TX
4. RX
5. SDA
6. P19
7. P18
8. P5
9. TX1
10. RX1
11. P4
12. P2
13. P15
14. 3.3V

Software Support

• GitHub repo
  • Examples
  • Libraries

Assembly Sheet

• ESP32-I2C-HUB Assembly Sheet