chip for keypad interfcace?

S

starfire

Guest
Does anyone know of a newer version of a simple keypad interface chip
(provides debouncing, encoding, etc.) for a 4 X 4 keypad? The device I've
used in the past is the 74C922. While the chip still works very well, it is
somewhat dated and may be a little hard to find. Also, it there's a
surface-mount version, it would be better.

TIA

Dave
 
"starfire" <starfire151@cableone.net> schreef in bericht
news:jOednQxMy8UugfvUnZ2dnUVZ_hCdnZ2d@supernews.com...
Does anyone know of a newer version of a simple keypad interface chip
(provides debouncing, encoding, etc.) for a 4 X 4 keypad? The device I've
used in the past is the 74C922. While the chip still works very well, it
is
somewhat dated and may be a little hard to find. Also, it there's a
surface-mount version, it would be better.

TIA

Dave
Click to expand...
Chips like the 74C922 need to be connected to some controlling device, often
a micro. These these days one takes somewhat bigger a micro and incorporates
the keyboard function in it. Even if you need only the 74C922 function and
cannot buy that chip anymore it's much cheaper to get an 8-bits micro
(Microchip, Atmel or something similar) and program it then restarting the
production of an obsolete chip. Let alone developing a whole new one.

petrus bitbyter
 
starfire wrote:
Does anyone know of a newer version of a simple keypad interface chip
(provides debouncing, encoding, etc.) for a 4 X 4 keypad? The device I've
used in the past is the 74C922. While the chip still works very well, it is
somewhat dated and may be a little hard to find. Also, it there's a
surface-mount version, it would be better.
Dave
Click to expand...
http://www.google.com/search?q=4-x-4-keypad+PICmicro+note&filter=0&num=100

http://www.google.com/search?q=4-x-4-keypad+AVR&filter=0&num=100

etc.
 
"starfire" <starfire151@cableone.net> wrote in message
news:jOednQxMy8UugfvUnZ2dnUVZ_hCdnZ2d@supernews.com...
Does anyone know of a newer version of a simple keypad interface chip
(provides debouncing, encoding, etc.) for a 4 X 4 keypad? The device I've
used in the past is the 74C922. While the chip still works very well, it
is
somewhat dated and may be a little hard to find. Also, it there's a
surface-mount version, it would be better.

TIA

Dave
Click to expand...
Many thanks to those responding... It looks like a dedicated micro for
keypad interface is the way to go :)

Dave
 
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