Part number:
AN-426
Manufacturer:
Altera
File Size:
342.07 KB
Description:
Analog keyboard encoder.
Datasheet Details
Part number:
AN-426
Manufacturer:
Altera
File Size:
342.07 KB
Description:
Analog keyboard encoder.
AN-426, Analog Keyboard Encoder
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 keybo
AN-426 Features
* ust be strong enough when switch 1 is shorted, as shown in Equation 3. (3) ( VCC
* V OL )
* -R 1 < I OL Resistor stack R1-R5 and capacitor C1 forms an RC tim
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