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參數(shù)資料
| 型號： | LC75864E |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1/4 Duty LCD Display Drivers with Key Input Function |
| 中文描述： | 1 / 4占空比LCD顯示驅(qū)動(dòng)器，主要輸入功能 |
| 文件頁數(shù)： | 12/26頁 |
| 文件大?。?/td> | 188K |
| 代理商： | LC75864E |
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Sleep Mode Functions
Sleep mode is set up by setting S0 or S1 in the control data to 1. The segment outputs will all go low and the common
outputs will also go low, and the oscillator on the OSC pin will stop (it will be started by a key press). This reduces
power dissipation. This mode is cleared by sending control data with both S0 and S1 set to 0. However, note that the
S1/P1 to S4/P4 outputs can be used as general-purpose output ports according to the state of the P0 to P2 control data
bits, even in sleep mode. (See the control data description for details.)
Key Scan Operation Functions
1. Key scan timing
The key scan period is 384 T (s). To reliably determine the on/off state of the keys, the LC75864E/W scans the keys
twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low
level on DO) 800 T (s) after starting a key scan. If the key data does not agree and a key was pressed at that point, it
scans the keys again. Thus the LC75864E/W cannot detect a key press shorter than 800 T (s).
Note:
*
3. In sleep mode the high/low state of these pins is determined by the S0 and S1 bits in the control data. Key scan output signals are not output
from pins that are set low.
2. In normal mode
The pins KS1 to KS6 are set high
When a key is pressed a key scan is started and the 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 800 T (s) (where T =
) the LC75864E/W outputs a key data read request (a
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 LC75864E/W
performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1
and 10 k
).
1
f
OSC
No. 6860-12/26
LC75864E, 75864W
T =
KS1
*
3
*
3
1
1
KS2
*
3
*
3
2
2
KS3
*
3
*
3
3
3
KS4
*
3
*
3
4
4
KS5
*
3
*
3
5
Key on
768T (s)
5
KS6
6
6
1
fosc
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC75873NE | 1/3 Duty General Purpose LCD Display Driver(1/3占空普通用途LCD顯示驅(qū)動(dòng)器) |
| LC75874E | 1/4-Duty General-Purpose LCD Display Driver(1/4占空通用LCD顯示驅(qū)動(dòng)器) |
| LC75878W | 1/8 to 1/10 Duty General-Purpose LCD Display Drivers |
| LC75883E | 1/3 Duty LCD Display Driver with Key Input Function(1/3占空具有鍵輸入功能的LCD顯示驅(qū)動(dòng)器) |
| LC75884 | 1/4 Duty LCD Display Drivers with Key Input Function |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC75864W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/4 Duty LCD Display Drivers with Key Input Function |
| LC75873NE | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/3 Duty General-Purpose LCD Display Driver |
| LC75873NW | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/3 Duty General-Purpose LCD Display Driver |
| LC75873NWHS-SH-E | 功能描述:LCD 驅(qū)動(dòng)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(shí)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 |
| LC75874 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/4-Duty General-Purpose LCD Display Driver |
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