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參數(shù)資料
| 型號(hào)： | EDE1144 |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Keypad Encoder IC |
| 中文描述： | 鍵盤(pán)編碼器IC |
| 文件頁(yè)數(shù)： | 3/7頁(yè) |
| 文件大小： | 63K |
| 代理商： | EDE1144 |
EDE1144 Keypad Encoder IC
Page 3/7
0
4
8
12
1
5
9
13
2
6
10
14
3
7
11
15
Beeper
Output
D0
D1
D2
D3
Data
Valid
Data Output
Row 1
Row 2
Row 3
Row 0
Column 3
Column 2
Column 1
Column 0
Serial
Output
2400 / 9600 Baud Select Input
4x4 Multiplexed Keypad
EDE1144
Keypad
Encoder
Figure One: Connection Block Diagram
As illustrated by Figure One, the EDE1144 resides between the keypad and host microcontroller/
processor. The host microcontroller receives keypress data via either the four parallel data
outputs (D0-D3, Pins 6-9) or the Serial Data Output (Pin 1). The Data Valid signal (Pin 17) is
activated upon keypress (and upon each key repeat cycle if key is held). The Data Valid signal is
activated prior to transmission of the serial data to allow polled (software-UART) style host serial
systems such as the BASIC Stamp or a microcontroller without a hardware UART to enter the
serial receive routine and receive the keypress data without needing to continually wait for the
start bit. Note that the data outputs to the host microcontroller reside on the row output pins
(Pins 6-9), therefore parallel-output data should only be read while the Data Valid (Pin 17) signal
is active (low). Upon powerup, the four data output pins will be high, and will remain high
except when a key is pressed.
The following table illustrates the data values returned by the serial and parallel outputs of the
EDE144 upon each keypress. Note that the serial values are increased (by Hexadecimal 30 ($30)
for 0-9 and Hex $37 for 10-15) to correspond to the ASCII equivalent (0-9,A-F) of the BCD
(binary-coded decimal) value on the parallel outputs.
Key:
RS-232:
0
1
2
3
4
5
6
7
$30
('0')
0000
$31
('1')
0001
$32
('2')
0010
$33
('3')
0011
$34
('4')
0100
$35
('5')
0101
$36
('6')
0110
$37
('7')
0111
D3..D0:
Key:
RS-232:
8
9
10
$41
('A')
1010
11
$42
('B')
1011
12
$43
('C')
1100
13
$44
('D')
1101
14
$45
('E')
1110
15
$46
('F')
1111
$38
('8')
1000
$39
('9')
1001
D3..D0:
Table One: Keynumber vs. Output Data
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EDE-1144 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Keypad Encoder IC |
| EDE1200 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Unipolar Stepper Motor IC |
| EDE1204 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Bi-Polar Stepper Motor IC |
| EDE12400 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:BI-POLAR CHOPPER STEPPER MOTOR CONTROL MODULE |
| EDE1400 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Parallel-Printer Interface IC |
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