Date: 19/09/2011

Single-wire 5 channel I/O expander with STSW tech

Texas Instruments Incorporated (TI) says its newly launched TCA5405, a single-wire I/O expander with self-timed, single-wire (STSW) technology allows system designers to control and expand outputs to as many as five, using a single processor general purpose input/output (GPIO) and 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.

Key features and benefits as per TI include:
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.
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.


Available: Now
Price: $0.65 in quantities of 1K

For more information visit: www.ti.com