Part Number
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AN-426 |
Manufacturer
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Altera |
Description
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Analog Keyboard Encoder |
Published
|
Apr 18, 2009 |
Detailed Description
|
www.datasheet4u.com
Using MAX II CPLDs as Analog Keyboard Encoders
Application Note 426
July 2006, Version 1.0
Introd...
|
Datasheet
|
AN-426
|
Overview
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datasheet4u.
com
Using MAX II CPLDs as Analog Keyboard Encoders
Application Note 426
July 2006, Version 1.
0
Introduction
Keyboard encoders are a very common application for CPLDs.
Typically a processor, ASSP, or ASIC does not have enough pins for keypads or keyboards.
I/O expansion is a very common function for CPLDs and allows a processor to decode a very large keyboard with very few I/Os.
Even though CPLDs like MAX® and MAX® II may have abundant low-cost I/Os, decoding a keypad or keyboard with one I/O per switch is not desirable.
The advantage of decoding a keyboard with fewer wires is that it reduces the number of wires going from a keypad to a main circuit board or it reduces the...
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