TCA9548A_15 Datasheet, PDF (18/35 Pages) Texas Instruments – Low-Voltage 8-Channel I2C Switch With Reset

TCA9548A
SCPS207E – MAY 2012 – REVISED OCTOBER 2015
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
Applications of the TCA9548A will contain an I²C (or SMBus) master device and up to eight I²C slave devices.
The downstream channels are ideally used to resolve I²C slave address conflicts. For example, if eight identical
digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.
When the temperature at a specific location needs to be read, the appropriate channel can be enabled and all
other channels switched off, the data can be retrieved, and the I²C master can move on and read the next
channel.
In an application where the I²C bus will contain many additional slave devices that do not result in I²C slave
address conflicts, these slave devices can be connected to any desired channel to distribute the total bus
capacitance across multiple channels. If multiple switches will be enabled simultaneously, additional design
requirements must be considered (see Design Requirements and Detailed Design Procedure).
9.2 Typical Application
Figure 13 shows an application in which the TCA9548A can be used.
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