800-mA Linear Charger for 1- to 4-Cell Supercapacitor, 40-V load-dump tolerant to support charging backup supercapacitor, 3-V to 18-V operating Integrated fault protection – 18-V IN overvoltage protection – 1000-mA overcurrent protection – 125°C thermal regulation; 150°C thermal shutdown protection – ISET pin short protection

The TCA9555 is a 16-bit I/O expander for the I2C bus, designed for voltage operation from 1.65 V to 5.5 V. It provides general-purpose remote I/O expansion for most microcontroller families through the I2C interface. This device features low standby- current consumption, 5-V tolerant I/O ports, and an open-drain active-low interrupt output. It is commonly used for controlling LEDs, controlling enable or reset signals of other devices, and reading the outputs of other devices or buttons.

The TCA9555, manufactured by Texas Instruments, is a low-voltage 16-bit I/O expander designed for both I2C and SMBus for operation with a supply voltage ranging from 1.65 V to 5.5 V. This component is aimed at providing general-purpose remote I/O expansion for most microcontroller families through the I2C interface. The TCA9555 is characterized by its low standby-current consumption of maximum 3.5 uA and includes notable features such as open-drain active-low interrupt output, 5-V tolerant I/O ports, and configurable slave addresses through 3 address pins. It is designed to assist in applications such as servers, routers, personal computers, personal electronics, and industrial automation equipment, among others. Its multiple package options, including TSSOP, SSOP, WQFN, and VQFN, accommodate different sizes and form factors suitable for diverse implementation requirements. The device distinguishes itself with a polarity inversion register and latched outputs capable of directly driving LEDs, showcasing versatility in usage. Its protection features exceed JESD 22 standards for ESD, ensuring robustness for industrial applications. The TCA9555's compatibility with various microcontrollers and support for up to 400-kHz I2C bus speed make it an efficient solution for expanding I/O capabilities in space-constrained applications.