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參數(shù)資料
| 型號(hào)： | 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(dòng)頻率顯示 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LC75741E |
Multiple Key Presses
The LC75742E/W, even without diodes in the key scan lines, can scan for any combination of dual key presses, any
combination of triple key presses on any of the KI1 to KI5 key scan input pin lines, or any combination of multiple key
presses on any of the KS1 to KS6 key scan output lines. However, keys that are not pressed may be seen as having been
pressed for any other multiple key press combination. Accordingly, applications must insert diodes at each key. Also, to
reject any triple and higher multiple key presses, if three or more data readout are 1 ignore the data by the software or in
other ways.
Notes on the BLK Pin and Display Control
Since the states of the IC internal data (D1 to D82, and the control data) are undefined when power is first applied,
applications should turn off the display (i.e. set S1 to S41, and G1 and G2 low) by setting the BLK pin low at the same
time as power is applied. Applications should transfer all 128 bits of the serial data while BLK is held low, and only then
set BLK high. This will prevent random meaningless display at power on. (See figure 4.)
Note on the Power on Sequence
Applications must observe the following sequences when turning the power on or off.
At power on: First turn on the logic system power (V
DD
), and then turn on the driver power (V
FL
)
At power off: First turn off the driver power (V
FL
), and then turn off the logic system power (V
DD
).
No. 6142-11/18
LC75742E, LC75742W
Serial data transfer
Serial data transfer
Serial data transfer
Key data read
Key data read request
Key data read
Key data read request
Key address (8FH)
Key address
Figure 4
Key input
(KS6 line)
Key scan
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(dòng)器) |
| LC75754M | 1/3 Duty VFD Driver(1/3占空VFD顯示驅(qū)動(dòng)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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