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參數(shù)資料
| 型號： | LC75741E |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1/2 Duty Driver for Frequency Displays |
| 中文描述： | 1 / 2的責(zé)任驅(qū)動頻率顯示 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LC75741E |
In normal mode
— The pins KS1 to KS6 are set high.
—
A key scan is started when any of the keys is pressed, and the keys are kept scanning until all keys are released.
The controller can recognize simultaneous multiple key presses by checking the key data for multiple bits being set.
— If a key is pressed for over 25600T [s] (where T = 1/f
OSC
), the IC outputs a key data read request to the controller
by setting DO low. The controller acknowledges this state and reads the key data. However, note that DO will go
high when CE is set high during the serial data transfer.
— After the controller key data readout completes, the key data read request will be cleared (DO will be set high), and
the IC performs another key scan. Note that since DO is an open-drain output, a pull-up resistor (between 1 and
10 k
) is required.
In sleep mode
— The pins KS1 to KS6 are set to high or low according to the values of S0 and S1 in the control data. (See the
description of the control data elsewhere in this document.)
—
If a key connected to one of the KS1 to KS6 lines that was set high is pressed, the clock generator (oscillator circuit)
is started and a key scan is performed, and the keys are kept scanning until all keys are released.
The controller can recognize simultaneous multiple key presses by checking the key data for multiple bits being set.
— If a key is pressed for over 25600T [s] (where T = 1/f
OSC
), the IC outputs a key data read request to the controller
by setting DO low. The controller acknowledges this state and reads the key data. However, note that DO will go
high when CE is set high during the serial data transfer.
— After the controller key data readout completes, the key data read request will be cleared (DO will be set high), and
the IC performs another key scan. However, sleep mode will not be cleared. Note that since DO is an open-drain
output, a pull-up resistor (between 1 and 10 k
) is required.
— Example of a key scan operation in sleep mode
Example: Sleep mode with S0 = 0, S1 = 1 (Only KS6 is set high)
Note
*
: These diodes are required to reliably recognize multiple key presses on the KS6 line when the IC is set to sleep mode with only KS6 set to high as in
the example above. That is, they prevent incorrect recognition of key presses due to sneak currents arising from simultaneous presses of keys on
the KS1 through KS5 lines.
No. 6142-10/18
LC75742E, LC75742W
If one of these keys is pressed, clock
generator (oscillator circuit) is started and
a key scan is performed.
Serial data transfer
Key input 1
Key input 2
Key scan
Serial data transfer
Serial data transfer
Key data read
Key data read request
Key data read
Key data read request
Key data read
Key data read request
Key address (8FH)
Key address
Key address
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC75742E | RES 36K OHM 1/8W 5% 0805 SMD |
| LC75742W | 1/2 Duty VFD Driver with Key Input Function |
| LC75750W | 1/3 Duty VFD Driver(1/3占空VFD顯示驅(qū)動器) |
| LC75754M | 1/3 Duty VFD Driver(1/3占空VFD顯示驅(qū)動器) |
| LC75757E | LC75757E/W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC75741W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/2 Duty Driver for Frequency Displays |
| LC75742E | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/2 Duty VFD Driver with Key Input Function |
| LC75742W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/2 Duty VFD Driver with Key Input Function |
| LC7574E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Vacuum Fluorescent Display Driver |
| LC7574NE | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/2 Duty VFD Driver for Frequency Display |
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