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參數(shù)資料
| 型號： | LC75804W |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1/3, 1/4 Duty LCD Display Drivers with Key Input Function |
| 中文描述： | 1 / 3，1 / 4占空比LCD顯示驅(qū)動器，主要輸入功能 |
| 文件頁數(shù)： | 17/37頁 |
| 文件大小： | 297K |
| 代理商： | LC75804W |
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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 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 LC75804E/W
performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1
and 10 k
).
No. 6266-17/37
LC75804E, LC75804W
Key on
576T[s]
*
3
*
3
*
3
*
3
*
3
*
3
*
3
*
3
*
3
1
1
2
2
3
3
4
4
5
5
6
6
KS5
KS4
KS3
KS6
KS2
KS1
*
3
T=
1
fosc
DI
DO
CE
615T[s]
615T[s]
615T[s]
T=
1
fosc
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.
Key Scan Operation Functions
1. Key scan timing
The key scan period is 288T(s). To reliably determine the on/off state of the keys, the LC75804E/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) 615T(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 LC75804E/W cannot detect a key press shorter than 615T(s).
Key input 1
Key input 2
Key scan
Key data read request
Key data read request
Key data read request
Key data read
Key data read
Key data read
Serial data transfer
Serial data transfer
Serial data transfer
Key address (43H)
Key address
Key address
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC75804W-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 |
| LC75804WS-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 |
| LC75805PEH-3H | 制造商:ON Semiconductor 功能描述:LED AND LCD DISPLAY DRIVE - Trays 制造商:ON Semiconductor 功能描述:FTRAY / LED AND LCD DISPLAY DRIVE |
| LC75805PES-3H | 制造商:ON Semiconductor 功能描述:LED AND LCD DISPLAY DRIVE - Trays |
| LC75806PT-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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