*The RoHS icon on this product indicates that the PCBs, components, solder, and chemicals are all lead-free and RoHS compliant. Additionally, this product is produced using a lead-free process. Unfortunately, we are currently unable to provide documentation confirming that this product is RoHS compliant.
Resources:
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Package Includes:
This package doesn't include DIN-Rail PCB holder and cables.
Notes:
- This board uses 4-pin 2.00mm connectors for I2C bus.
Features:
- Bidirectional switcher: 1-Channel to 8-Channel
- I2C bus multiplexer chips: TCA9548A
- I2C bus speed: 400kHz (Fast mode)
- Configurable I2C bus pull-up resistors
- Address by 3 jumpers for use of up to 8 addresses
- Operating voltage: 1.65V to 5.5V
- Inverse polarity protection circuits for TCA9548A
- Mountable on DIN-Rail PCB holder
- PCB dimensions: 42.50 x 72.00 mm
Many electronic devices such as sensors and actuators interface with microcontrollers through the I2C bus. However, the I2C bus has some limitations, including the number of available addresses and the bus capacitance. All devices on the same bus must have a unique address, but many devices are manufactured with identical addresses, even when produced by different companies.
Another limitation is bus capacitance, which depends on the number of devices connected to the bus and the length of the cables. Increasing the number of I2C buses can solve these issues. However, if a microcontroller does not provide enough I2C buses, bus multiplexing can offer a practical solution.
The I2C-MUX9548M is an 8-channel bidirectional I2C bus multiplexer. It is designed based on the TCA9548A, which can switch the SCL and SDA lines of a master I2C bus to eight different channels. The signals on the master SCL and SDA lines can be routed to individual channels or to any combination of channels.
The I2C-MUX9548M supports bus frequencies up to 400 kHz and includes selectable pull-up resistors for the SDA and SCL lines of both the master bus and each individual channel. The board also provides a RESET pin with a pull-up resistor.
For protection, the board includes reverse-polarity circuitry to prevent damage to the TCA9548A caused by incorrect power supply connections.
The I2C-MUX9548M supports a wide operating-voltage range, making it suitable for use with both low-voltage microcontrollers and standard 5V microcontrollers.
For industrial applications, the board can be mounted on a DIN-Rail PCB holder.
To prevent damage to the board, do not plug or unplug I2C cables while the power supply is on. Always turn off the power supply before plugging or unplugging I2C cables on the board.
