TI introduces industry's smallest single-wire I/O expander

DALLAS, USA: Texas Instruments Inc. (TI) has introduced the industry's smallest single-wire I/O expander with self-timed, single-wire (STSW) technology.

The TCA5405 allows system designers to control and expand outputs to as many as five, using a single processor general purpose input/output (GPIO). This expander reduces the number of connections needed, thus eliminating 50 percent of the lines versus I2C, and 75 percent compared to a serial peripheral interface (SPI) bus.

This device can be implemented in many design configurations that require a small footprint, such as cell phones, personal digital assistants (PDAs), portable media players, and portable instrumentation devices such as blood glucose meters and insulin pumps.

TCA5405 key features and benefits
* Easier implementation of port expansion makes it suitable for simple functions, such as chip select (CS) or enable (EN) pins, as well as complex functions like driving LEDs (<20 mA).
* One-wire protocol-based port expansion in an eight-pin, 2.25-mm2 micro-QFN package makes it the industry's smallest five-channel expander.
* STSW interface reduces connections by as much as 50 percent versus I2C, and 75 percent versus serial peripheral interface (SPI).
* Standby current consumption, which is 20 percent lower than the nearest competitor, supports power-savvy, high-performance applications with 2 uA and a drive strength current of +20 mA.