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參數(shù)資料
| 型號： | PCE84C487 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for digital auto-sync and VST TV controller applications |
| 中文描述： | 微控制器的數(shù)字自動同步和VST電視控制器的應(yīng)用 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大小： | 168K |
| 代理商： | PCE84C487 |
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1996 Feb 21
20
Philips Semiconductors
Objective specification
Microcontrollers for digital auto-sync and
VST TV controller applications
PCE84C486; PCE84C487
8.2
A typical application for keypad detection
The ADC channels of the PCE84C48X 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.17.
When no key is depressed the input voltage at the ADC
input 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 ADC input pin
will change, and as each key will generate its own unique
input voltage, this can be measured by the ADC 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
×
=
Fig.17 A typical ADC application for keypad detection.
handbook, halfpage
5 k
key 14
ADCx
VDD
MGC910
PCE84C486
PCE84C487
key 13
key 2
key 1
2 k
2 k
1
μ
F
2 k
1 k
14 key matrix
100 k
VSS
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