October 26, 2009 -
Key scan device, TCA8418, can generate interrupt output signal using 3-key combination to free up processor from scanning keys for presses/releases while conserving power and bandwidth. Integrated oscillator debounces at 50 µs and maintains 10-byte FIFO of key-press and key-release events, enabling storage of up to 10 keys with overflow wrap capability. Also, 18 GPIO can be configured into 8 inputs and 10 outputs supporting 8 x 10 key array (80 buttons) through I²C(TM) interface.
Texas Instruments Announces First QWERTY-Capable I2C Keypad/Keyboard Controller
Frees up processors by eliminating the need to scan the keys for presses and releases
DALLAS, Oct. 20 -- Texas Instruments Incorporated (TI) (NYSE:TXN) today introduced the TCA8418, a key scan device that can generate an interrupt output signal using a three-key combination such as CTRL-ALT-DEL, which frees up the processor from scanning the keys for presses and releases, saving power and bandwidth. The TCA8418 supports applications such as smartphones, multimedia handsets, personal digital assistants (PDA) and mobile Internet devices (MID). For more information or to request samples, please see www.ti.com/tca8418-pr.
Key features and benefits of the TCA8418
-- The key controller includes an oscillator that debounces at 50 us and maintains a 10-byte FIFO of key-press and key-release events, which can store up to 10 keys with overflow wrap capability.
-- An interrupt (/INT) output can be configured to alert key presses and releases, either as they occur or at maximum rate.
-- Power supply voltage operating range of 1.65 V to 3.6 V allows for glueless interface to today's most advanced processors.
-- Eighteen general purpose inputs/outputs (GPIO) can be configured into eight inputs and ten outputs, which supports an 8 x 10 key array (80 buttons) through the I2C(TM) interface.
-- Low standby (idle) current consumption of 3 uA extends battery life in portable devices.
-- Can be used with a processor that has limited GPIOs, and is compatible with a variety of advanced processors including many of TI's OMAP(TM) 3 applications processors.
Availability and pricing
The TCA8418 is available now in the 4 mm x 4 mm QFN package and is priced at $1.20 in quantities of 1,000. A smaller, 2 mm x 2 mm WCSP version will be available in 1Q2010, offering a reduction of 75 percent board space over competitive devices.
Texas Instruments (NYSE:TXN) helps customers solve problems and develop new electronics that make the world smarter, healthier, safer, greener and more fun. A global semiconductor company, TI innovates through manufacturing, design and sales operations in more than 30 countries. For more information, go to www.ti.com.
Trademarks
All registered trademarks and other trademarks belong to their respective owners. Company Information: Name: Texas Instruments, Inc. (TI) Address: 12500 TI Blvd. City: Dallas State: TX ZIP: 75243-4136 Country: USA Phone: 800-336-5236 FAX: 972-995-4360 http://www.ti.com/
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