TCA9548A_16 Datasheet, PDF (19/36 Pages) Texas Instruments – Low-Voltage 8-Channel I2C Switch with Reset

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9 Application and Implementation
TCA9548A
SCPS207F – MAY 2012 – REVISED NOVEMBER 2016
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 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 contains 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 are enabled simultaneously, additional design requirements must
be considered (see the Design Requirements section and Detailed Design Procedure section).
9.2 Typical Application
Figure 13 shows an application in which the TCA9548A can be used.
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