Push Buttons - Texas Instruments BoosterPack BOOSTXL-IOLINKM-8 EVM User Manual

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2.4 Push Buttons

The board has one push button shown in
LaunchPad and BOOSTXL-IOLINKM-8 boards through the board-to-board mating headers, additional GPIO pins
were created using a TCA6424A I2C-to-GPIO Expander. The MCU firmware should configure these GPIO pins
to the proper direction (Input or Output) as well as the High or Low state through communication on the I2C bus.
Pressing this push button switch S1 labeled "GPIO_RST" reset the TCA6424A registers to their default values. It
is not expected that the user needs to use this push button during normal operation.
SLLU357 – MAY 2023
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Figure 2-3. Due to the limited GPIO pins available between the
Figure 2-3. GPIO Reset Push Button
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BOOSTXL-IOLINKM-8 EVM User's Guide
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