Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

AN1775 Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc

Part No. AN1775
Description  Expanding Digital Input with an A/D Converter
Download  12 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo 

AN1775 Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc

 
Zoom Inzoom in Zoom Outzoom out
 1 / 12 page
background image
© 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.
Some applications require all available bidirectional or input-only pins for
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.
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor
© Freescale Semiconductor, Inc., 2004. All rights reserved.


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn