Compact I/O expanders increase GPIO resources

As designers of portable systems develop versions of their core designs for different market, they often need to add features and functions but find that their controller has limited GPIO resources.

As designers of portable systems develop versions of their core designs for different market, they often need to add features and functions but find that their controller has limited GPIO resources.

With the AAT4296 and AAT4298 compact I/O expanders from Advanced analogueueic Technologies, designers can control these additional functions without altering their original platform, and in the process, simplify their design, cut cost, and get to market quicker.

Offering the ability to manage up to six functions with a single control wire, the devices allow designers to simply and easily expand GPIO resources in portable, battery-powered systems.

The AAT4296 features five push/pull outputs, while the AAT4298 offers six.

The state of each independent push/pull channel is controlled with a single GPIO via the EN/SET pin using the company's Simple Serial Control interface.

The easy-to-use interface requires a string of pulses, followed by a 500us latch time.

Both the AAT4296 and AAT4298 can facilitate voltage level-shifting as they operate over a 1.8 to 5.0V input voltage range, with EN/SET voltage input level as low as 1.4V.

To help meet the stringent power and space requirements of battery-powered products, both devices consume just 3uA quiescent current typical and are offered in small footprint packages.

The AAT4296 is immediately available in a Pb-free, 8-pin, 2.0x2.2mm SC70JW package.

The AAT4298 is offered in a lead-free, 12-pin, 3.0 x 2.85mm TSOPJW package.

Both devices are specified across the -40 to +85C temperature range.

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