- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382381 > PCE84C886 (NXP SEMICONDUCTORS) Microcontroller for monitor OSD and auto-sync applications PDF資料下載
參數(shù)資料
| 型號： | PCE84C886 |
| 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 |
| 中文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, PLASTIC, SDIP-42 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大小： | 168K |
| 代理商： | PCE84C886 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCF1000 | Analog IC |
| PCF600 | Analog IC |
| PCF1174C | 4-digit static LCD car clock |
| PCF1174CT | 4-digit static LCD car clock |
| PCF1174CU | 4-digit static LCD car clock |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCEA02 | 制造商:ADAM-TECH 制造商全稱:Adam Technologies, Inc. 功能描述:.100&.156 RECEPTACLE WITH BOARD HOOKS |
| PCE-A-05 | 制造商:ADAM-TECH 制造商全稱:Adam Technologies, Inc. 功能描述:.100 RECEPTACLE WITH BOARD HOOKS |
| PCEA10 | 制造商:ADAM-TECH 制造商全稱:Adam Technologies, Inc. 功能描述:.100&.156 RECEPTACLE WITH BOARD HOOKS |
| PCEA20 | 制造商:ADAM-TECH 制造商全稱:Adam Technologies, Inc. 功能描述:.100&.156 RECEPTACLE WITH BOARD HOOKS |
| PCEB02 | 制造商:ADAM-TECH 制造商全稱:Adam Technologies, Inc. 功能描述:.100&.156 RECEPTACLE WITH BOARD HOOKS |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。