A semiconductor manufacturer, Texas Instruments has launched the TCA5405, a self-timed, single-wire I/O expander. The TCA5405 single-wire I/O expander enables system designers to expand and control up to five outputs using only one processor general purpose input/output (GPIO).
The expander decreases the number of connections required and in the process eliminates 50% and 75% lines as compared to I2C and a SPI (serial peripheral interface) bus respectively.
This device is compatible with design configurations such as personal digital assistants (PDAs), cell phones, portable media players as well as portable instrumentation devices like insulin pumps and blood glucose meters.
The features of the TCA5405 include an STSW (self-timed, single-wire) interface that ensures minimization of connections by around 75% against serial peripheral interface and by around 50% versus I2C. Designed for portable applications, it supports port expansion, making it well suited for simple functions that include enable pins, chip selects and complex functions such as driving LEDs while consuming less than 20 mA. The expander also features standby current consumption which enables support of high-performance, power-savvy applications with 2 uA and a drive strength current of ±20 mA.
The TCA5405 is available in a 2.25-mm2 RUG micro-QFN, 8-pin package.
Source: http://www.ti.com