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參數(shù)資料
| 型號： | EDE1144 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Keypad Encoder IC |
| 中文描述： | 鍵盤編碼器IC |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 63K |
| 代理商： | EDE1144 |
Copyright
1999 E-Lab Digital Engineering, Inc. All Rights Reserved.
Page 1/7
EDE1144 Keypad Encoder IC
4 x 4 Matrix Keypad Encoder IC
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
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
XMIT
Baud
+ 5V
+ 5V
GND
R0
R1
R2
R3
Beep
Valid
OSC1
OSC2
+ 5V
C3
C2
C1
C0
EDE1144
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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