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SCPS175B – NOVEMBER 2007 – REVISED JUNE 2014 TCA6424 Low-Voltage 24-Bit I2C AND SMBus I/O Expander With Interrupt Output, Reset,
and Configuration Registers
Not Recommended for New Designs 1 Features 2 Description This 24-bit I/O expander for the two-line bidirectional
bus (I2C) is designed to provide general-purpose
remote I/O expansion for most microcontroller
families via the I2C interface [serial clock (SCL) and
serial data (SDA)]. The major benefit of this device is its wide VCC range.
It can operate from 1.65 V to 5.5 V on the P-port side
and on the SDA/SCL side. This allows the TCA6424
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 5-V power
supply.
The bidirectional voltage level translation in the …