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'12C508 typical apps ??'
1997\06\10@213937 by Ravindra Divekar

picon face
hi everybody,

could you tell me typical applications
of those cute 8-pin 12C508s. ?

they pack so much neat stuff, but have only 6 I/Os,
so where can they be used ?

Thanks!  ravindra/.

1997\06\11@021728 by Dan Mulally

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Ravindra Divekar wrote:
>
> hi everybody,
>
> could you tell me typical applications
> of those cute 8-pin 12C508s. ?
>
> they pack so much neat stuff, but have only 6 I/Os,
> so where can they be used ?
>
> Thanks!  ravindra/.

For controlling things with a serial bus they're handy. The SPI bus for
example only requires 4 lines for 2 way communication. I'm using one to
control an ISD33000 Voice record/playback IC. Depending on the model and
sampling rate one can record and playback up to 4 minutes of audio.
Messages can also be segmented for say an answering machine application
where you may want to jump to the next message.

1997\06\11@030241 by Mike

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At 05:30 PM 6/10/97 -0700, you wrote:
>hi everybody,
>
>could you tell me typical applications
>of those cute 8-pin 12C508s. ?
>
>they pack so much neat stuff, but have only 6 I/Os,
>so where can they be used ?

Electronic locks
PID controls
motor controls
data loggers

etc

etc


Some say there is no magic but, all things begin with thought then it becomes
academic, then some poor slob works out a practical way to implement all that
theory, this is called Engineering - for most people another form of magic.
                                                                      Massen

1997\06\11@093401 by Rick Miller

picon face
> hi everybody,
>
> could you tell me typical applications
> of those cute 8-pin 12C508s. ?
>
> they pack so much neat stuff, but have only 6 I/Os,
> so where can they be used ?
>
> Thanks!  ravindra/.

I just recommended a 12C508 to a coworker who was pulling his hair out over
a temperature compensated battery charging power supply design.  He was
having a hell of a time trying to create an analog circuit using a
thermistor to vary the feedback to the regulator.  He had an op-amp, a
bunch of resistors, even a crude power supply to start up the op-amp before
the regulator was working, then diodes to keep that from screwing up the
regulator, etc.  It was getting pretty darned huge.

Then I said (half in jest), "Why not just use an 8-pin PIC, one of those
1-wire thermometers, and a digitally programmable resistor?  Three parts
and a piecewise function in firmware and you're done."

Well, the PICSTART PLUS is on its way now...     :-)

Think too what you might do if you have a complex timing circuit.  You
might have several input signals and some sort of mess of 555 timers,
capacitors, resistors, and other logic chips to make it give you the
control signal output you want...  All of that can be replaced with a
single, 8-pin part.  The PIC can keep track of time more accurately than a
555 and all of the logical relationships are a snap to do in firmware.  I
know of several circuits I've had to work on (before the 8-pin PIC) which
could have used it.  Having a price under [US]$2.00 helps, but the board
space saved would have been worth more than that for me.

Rick Miller
spam_OUTrdmillerTakeThisOuTspamexecpc.com

1997\06\11@093514 by rtracy

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Ravindra Divekar wrote:
>
> hi everybody,
>
> could you tell me typical applications
> of those cute 8-pin 12C508s. ?
>
> they pack so much neat stuff, but have only 6 I/Os,
> so where can they be used ?
>
> Thanks!  ravindra/.


I use dual 12C509s in a industrial safety application.  It is a
mechanical hard guard for riveting machines.  The processors lower a
arm/guard over the work area, make shure no fingers are in the way and
then cycle the rivet machine.  Its really not that simple.  Machine
operators will do just about anything to remove the protected guard or
bypass it's safety.  The micros are constantly checking for "strange"
operation to keep operators from tampering.  2 micros are used to check
each others inputs and outputs, for redundancy.  So, if anything fails
the machine will fail safe.  I love the little 12Cs, there so cheap.
When are the A/D 12Cs coming out?

Rob Tracy
FotoShield Controls

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