The TCA9554 is a 16-pin device that provides 8 bits of general purpose parallel input and
output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus)
protocol. The device can operate with a power supply voltage ranging from 1.65 V to 5.5 V. The
device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O
expanders such as the TCA9554 provide a simple solution when additional I/Os are needed for
switches, sensors, push-buttons, LEDs, fans, and other similar devices.
The features of the TCA9554 include an interrupt that is generated on the
INT pin whenever an input port changes state. The A0, A1, and A2 hardware
selectable address pins allow up to eight TCA9554 devices on the same
I2C bus. The device can also be reset to its default sate by cycling the
power supply and causing a power-on reset.
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