[E-Lab Digital Engineering, Inc.]

The EDE1144 Keypad Encoder IC is designed to interface a matrix-type 4 row x 4 column (16 key or less) keypad to a microcontroller or other host processor. A one-wire serial or four-wire parallel interface returns the keypress data and can be used in conjunction with a data valid signal for polled or interrupt-driven applications. The EDE1144 provides enhanced keypad features such as contact debouncing and key auto-repeat in an easy-to-use package that will lower software overhead in the host microcontroller and reduce the I/O pin requirements from eight to one, frequently resulting in the use of a less costly host microcontroller in your design.

Functionality & Feature Set:

• Automatic key repeat after delay

• Contact debouncing

• Keybeep provides tactile feedback to operator

• Electrically quiet (reduced EMI) keypad scanning

• Serial / Parallel outputs available

• Data Valid output signal for interrupt activation

• 2400/ 9600 serial Baud rates

• Available in 18 pin DIP or SOIC packages

• Interfaces to any microcontroller or microprocessor

• Cost effective for OEM applications