The TCA6408A-Q1 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. This device can operate with a power supply voltage ranging from 1.65 V to 3.6 V
on both the I2C bus side (VCCI) and on the P-port
side (VCCP). This allows the TCA6408A-Q1 to interface with next-generation
microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to
conserve power. In contrast to the dropping power supplies of microprocessors and microcontrollers,
some PCB components such as LEDs remain at a higher power supply.
The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock
frequencies. I/O expanders such as the TCA6408A-Q1 provide a simple solution when additional I/Os
are needed for switches, sensors, push-buttons, LEDs, fans, and so forth.
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