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AN-426

Altera
Part Number AN-426
Manufacturer Altera
Description 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 PDF File AN-426 PDF File

AN-426
AN-426

Overview
www.
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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