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參數(shù)資料
| 型號： | PCE84C882 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontroller for monitor OSD and auto-sync applications(監(jiān)視器屏幕顯示和自動同步應(yīng)用的微控制器) |
| 中文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, PLASTIC, SDIP-42 |
| 文件頁數(shù)： | 18/60頁 |
| 文件大?。?/td> | 409K |
| 代理商： | PCE84C882 |
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1996 Jan 08
18
Philips Semiconductors
Preliminary specification
Microcontroller for monitor OSD
and auto-sync applications
PCE84C882
8.2
Typical ADC application
The ADC2 channel of the PCE84C882 can be used in
keypad applications to detect and identify the operation of
individual keys. The circuit for a 14-key application is
shown in Fig.14.
When no key is depressed the input voltage at the
DP12/ADC2 pin will be greater than
15
16
×
V
DD
and if the
DAC value selected is 1110 then the COMP bit will be
HIGH. When any key is depressed the input voltage at the
DP12/ADC2 pin will change, and as each key will generate
its own unique input voltage, this can be measured by the
ADC2 channel and the actual key depressed can then be
identified.
The input voltage generated by the operation of any key
(ignoring the effect of the 100 k
resistor) can be
calculated as follows:
Where n is the key number and can take any integer value
in the range 1 to 14.
The input voltage at the ADC input will be influenced by the
tolerance of the resistors and the length of the cable
connecting the keypad to the monitor. In the worse case
situation this may reduce the number of keys that can be
uniquely detected and identified.
V
ADCn
0.5
16
–
--n
)
V
DD
×
=
handbook, halfpage
5 k
key 14
DP12/ADC2
VDD
MGC718
PCE84C882
key 13
key 2
key 1
2 k
2 k
2 k
1 k
14 key matrix
100 k
VSS
Fig.14 A typical ADC application for keypad detection.
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|---|---|
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