CJMCU-9548 TCA9548A I2C 8 Channel Multiple Extensions Development Board

The CJMCU-9548 TCA9548A I2C 8 Channel Multiple Extensions Development Board is a convenient solution for dealing with I2C devices that have fixed addresses, allowing you to multiplex between multiple devices and access them individually. Here's a summary of its features and specifications:

  Features:  

• 1-to-8 bidirectional translating switches
• Supports hot insertion
• Low standby current
• Active-low reset input
• Power up with all switch channels deselected
• I2C bus and SMBus compatible
• 5V tolerant inputs
• Latch-up performance exceeds 100 mA per JESD 78, Class II

  Specifications:  

• Input Voltage: 1.65V to 5.5V
• Clock Frequency: 0 to 400 kHz
• Dimensions: 22mm x 32mm x 2.7mm
• Weight: 4g

  Pin Description:  

• Power Pins:
  • Vin: The power pin, should match the logic level of your microcontroller (e.g., 5V for Arduino)
  • GND: Common ground for power and logic
• I2C Control-Side Pins:
  • SCL: I2C clock pin for the chip itself, connect to your microcontroller's I2C clock line
  • SDA: I2C data pin for the chip itself, connect to your microcontroller's I2C data line
  • RST: Reset pin, pulled high by default, connect to ground to reset
  • A0, A1, A2: Address selection pins for the multiplexer
• I2C Multiplexed-Side Pins:
  • SDx and SCx: 8 sets of SDx and SCx pins, representing 8 separate I2C bus sets for multiplexing

  Programming:  You can use the provided helper function to select the port you want to communicate with, ranging from 0 to 7.

  Package Includes:  

• 1 x CJMCU TCA9548A I2C 8 Channel Multiple Extensions Development Board
• 2 x Header sets (unsoldered)

This development board is ideal for managing multiple I2C devices with fixed addresses, providing a simple and efficient way to access them individually using your microcontroller.