Datasheet > EDE-1144

EDE-1144

更新时间： 2024-11-06 21:53:23

品牌	Logo	应用领域
其他 - ETC		编码器
页数	文件大小	规格书
7页	64K
描述
Keypad Encoder IC

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数据手册

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EDE-1144 数据手册

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

Beep

Valid

OSC1

OSC2

+ 5V

XMIT

Baud

+ 5V

GND

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

Row 0 Output 6

Row 1 Output 7

Row 2 Output 8

Row 3 Output 9

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.

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