Texas Instruments TCA8418 Controlled Keypad Scan IC
Texas Instruments announced the TCA8418 key scan device. The TCA8418 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 is ideal for smartphones, multimedia handsets, personal digital assistants (PDA), and mobile Internet devices (MID). 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.
TI TCA8418 Keypad Scan IC Features
- 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 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 3 applications processors
More info: Texas Instruments TCA8418 I2C Controlled Keypad Scan IC (pdf)
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