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參數(shù)資料
| 型號(hào)： | AN1775 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Expanding Digital Input with an A/D Converter |
| 中文描述： | 擴(kuò)展數(shù)字輸入與A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 283K |
| 代理商： | AN1775 |
Motorola, Inc., 1998
AN1775 Rev. 1
Order this document
by AN1775/D Rev. 1
AN1775
Expanding Digital Input with an A/D Converter
By Brad Bierschenk
Freescale
Applications Engineering
Austin, Texas
Introduction
This application note documents a method of extending digital input
using the analog-to-digital converter (ADC) of a microcontroller unit
(MCU).
Many MCU applications require digital input and arbitration. For
example, determining which key of a keypad was pressed. This is
commonly done by arranging switches in a matrix configuration,
connecting to a series of digital input pins, and reading a digital input
data register to determine which key was pressed. While this method is
easily implemented, it does require the use of an MCU’s parallel port
pins.
Someapplicationsrequireallavailablebidirectionalorinput-onlypinsfor
other purposes. In such a case, an alternate method of arbitrating
keypresses is desired. By using the ADC of an MCU connected to a
resistor ladder, user input can be more efficiently processed.
F
For More Information On This Product,
Go to: www.freescale.com
n
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