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參數(shù)資料
| 型號： | LC75838E |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1/3 Duty LCD Display Drivers with Key Input Function |
| 中文描述： | 1 / 3職務(wù)液晶顯示驅(qū)動器與關(guān)鍵輸入功能 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 230K |
| 代理商： | LC75838E |
No. 7135-13/24
LC75863E, 75863W
3. In sleep mode
The pins KS1 to KS6 are set to high or low by the S0 and S1 bits in the control data. (See the control data
description for details.)
If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, the oscillator on the
OSC pin is started and a key scan is performed. Keys are scanned until all keys are released. Multiple key presses
are recognized by determining whether multiple key data bits are set.
If a key is pressed for longer than 615T(s)(Where T= fosc
low level on DO) to the controller. The controller acknowledges this request and reads the key data. However, if
CE is high during a serial data transfer, DO will be set high.
After the controller reads the key data, the key data read request is cleared (DO is set high) and the LC75863E/W
performs another key scan. However, this dose not clear sleep mode. Also note that DO, being an open-drain
output, requires a pull-up resistor (between 1 and 10 k
).
Sleep mode key scan example
Example: S0=0, S1=1 (sleep with only KS6 high)
Multiple Key Presses
Although the LC75863E/W is capable of key scanning without inserting diodes for dual key presses, triple key presses on
the KI1 to KI5 input pin lines, or multiple key presses on the KS1 to KS6 output pin lines, multiple presses other than
these cases may result in keys that were not pressed recognized as having been pressed. Therefore, a diode must be
inserted in series with each key. Applications that do not recognize multiple key presses of three or more keys should
check the key data for three or more 1 bits and ignore such data.
KI1
KI2
KI3
KI4
KI5
*
4
When any one of these keys is pressed,
the oscillatior on the OSC pin is started
and the keys are scanned.
Serial data
transfer
Key data read request
Key data read
Key data read
DO
DI
Serial data
transfer
Key address
(43H)
Key address
Serial data
transfer
CE
Key scan
Key input
(KS6 line)
615T[s]
615T[s]
Key data read request
T=
1
fosc
Note:
*
4.These diodes are required to reliable recognize multiple key presses on the KS6 line when sleep mode state with only KS6 high, as in the above
example. That is, these diodes prevent incorrect operations due to sneak currents in the KS6 key scan output signal when keys on the KS1 to KS5
lines are pressed at the same time.
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| LC75842 | General-Purpose 1/2 Duty LCD Display Driver |
| LC75844 | 1/4 Duty General-Purpose LCD Driver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC75838W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty General-Purpose LCD Display Drivers |
| LC75838W-E | 制造商:ON Semiconductor 功能描述:LCD DISPLAY DRIVER - Trays |
| LC75838WS-E | 功能描述:LCD 驅(qū)動器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| LC75839PW | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/4 and 1/3-Duty General-Purpose LCD Display Driver |
| LC75839PW-H | 功能描述:LCD 驅(qū)動器 LCD DISPLAY DRIVER RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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