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EDE1144

Part Number	EDE1144
Manufacturer	E-Lab
Description	Keypad Encoder IC
Published	Jan 8, 2007
Detailed Description	www.DataSheet4U.com EDE1144 Keypad Encoder IC 4 x 4 Matrix Keypad Encoder IC EDE1144 RS-232 Output 1 0=2400, 1=9600 Ba...
Datasheet	EDE1144 PDF File

Overview

www.
DataSheet4U.
com EDE1144 Keypad Encoder IC 4 x 4 Matrix Keypad Encoder IC EDE1144 RS-232 Output 1 0=2400, 1=9600 Baud 2 Connect to +5V 3 Connect to +5V 4 Digital Ground 5 Row 0 Output 6 Row 1 Output 7 Row 2 Output 8 Row 3 Output 9 XMIT Baud +5V +5V GND R0 R1 R2 R3 Beep Valid OSC1 OSC2 +5V C3 C2 C1 C0 18 Beeper Output 17 Data Valid Output 16 Oscillator Conection 15 Oscillator Connection 14 Connect to +5V 13 Column 3 Input 12 Column 2 Input 11 Column 1 Input 10 Column 0 Input 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 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.
In addition, the EDE1144 is electrically quiet.
Many keypad encoders continually scan the keypad, radiating EMI noise from the wires leading to the keypad (resulting in trouble during emissions testing & final product certification & approval).
The EDE1144 reduces this problem by monitoring the keypad with unchanging signals, and then scanning only once each time a keypress is detected.
Copyright © 1999 E-Lab Dig...

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EDE1144 Keypad Encoder IC - E-Lab

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