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參數(shù)資料
| 型號(hào)： | LC75817NE |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| 中文描述： | 1月8日至1月10日當(dāng)值點(diǎn)陣液晶顯示控制器/輸入功能的關(guān)鍵驅(qū)動(dòng) |
| 文件頁數(shù)： | 22/43頁 |
| 文件大?。?/td> | 829K |
| 代理商： | LC75817NE |
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No. 6144-22/43
LC75817E, 75817W
In normal mode
The pins KS1 to KS6 are set to high or low with the “set key scan output state” instruction.
If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high 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 4800T(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 LC75817E/W
performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1 and
10 k
).
Note:
*
18. Note that the high/low states of these pins are determined by the “set key scan output state” instruction, and that key scan output signals are not
output from pins that are set to low.
Key Scan Operation Functions
Key scan timing
The key scan period is 2304T(s). To reliably determine the on/off state of the keys, the LC75817E/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) 4800T(s) after starting a key scan. If the key data dose not agree and a key was pressed at that point, it
scans the keys again. Thus the LC75817E/W cannot detect a key press shorter than 4800T(s).
*
18
*
18
*
18
*
18
*
18
*
18
*
18
*
18
*
18
*
18
*
18
*
18
4608T(s)
Key input 1
Key input 2
Key scan
CE
DI
DO
4800T(s)
4800T(s)
4800T(s)
Serial data
transfer
Serial data
transfer
Key address
(43H)
Serial data
transfer
Key
address
Key data read request
Key data read
Key data read request
Key data read request
T=
1
fosc
Key data read
Key data read
Key
address
KS1
KS2
KS3
KS4
KS5
KS6
Key on
T=
1
fosc
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC75817NW | 1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| LC75821E | LCD Display Drivers |
| LC75822E | LCD Display Drivers |
| LC75823E | 1/3 Duty General-Purpose LCD Drivers |
| LC75824 | 1/4 Duty General-Purpose LCD Display Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC75817NW | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| LC75817W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controller/Driver with Key Input Function |
| LC75818PT | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| LC7581E | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers |
| LC7581T | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers |
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