参数资料
| 型号： | LC75806PT-H |
| 厂商： | ON Semiconductor |
| 文件页数： | 29/35页 |
| 文件大小： | 0K |
| 描述： | IC LCD DISPL DVR KEY-INP 100TQFP |
| 标准包装： | 90 |
| 系列： | * |
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LC75806PT
Notes on the Controller Key Data Read Techniques
1. Timer based key data acquisition
(1) Flowchart
CE=”L”
NO
DO=”L”
YES
Key data read
processing
(2) Timing chart
Key input
Key scan
Key on
Key on
t3
t4
t3
t3
CE
DI
t6
Key
address
t6
t6
t5
Key data read
t5
t5
DO
Key data read request
t7
t7
t7
t7
Controller
determination
(Key on)
Controller
determination
(Key on)
Controller
determination
(Key off)
Controller
determination
(Key on)
Controller
determination
(Key off)
t3 ······· Key scan execution time when the key data agreed for two key scans. (615T[s])
t4 ······· Key scan execution time when the key data did not agree for two key scans and the key scan was executed
again. (1230T[s])
t5 ······· Key address (43H) transfer time
t6 ······· Key data read time
T= f
1
OSC
=
1
fCK
(3) Explanation
In this technique, the controller uses a timer to determine key on/off states and read the key data. The controller
must check the DO state when CE is low every t7 period without fail. If DO is low, the controller recognizes that a
key has been pressed and executes the key data read operation.
The period t7 in this technique must satisfy the following condition.
t7>t4+t5+t6
If a key data read operation is executed when DO is high (DO does not generate a key data read request output), the
read key data (KD1 to KD30) and sleep acknowledge data (SA) will be invalid.
No.A1425-29/35
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相关代理商/技术参数 |
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| LC75806PTS-H | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| LC75806PTS-T-H | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| LC75808 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty LCD Display Drivers with Key Input Function |
| LC75808E | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty LCD Display Drivers with Key Input Function |
| LC75808W | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty LCD Display Drivers with Key Input Function |
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