Advice on Murata resonators
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Hi all,
I need some advice on the Murata resonators sold by Parallax.
When I connect such a resonator to a PIC, are the outer pins of the DIP
resonator
connected to the OSC1 and OSC2 pins while the middle pin connects to GND?
Or ...
Do those resonators require any additional capacitors and if so, how do
these connect?
The PIC manuals state diferent capacitor values.
Is it possible to connect a single resonator to multiple PIC's that are up
to 8 inches apart,
or would it be better to supply each PIC with its own resonator, keeping
tracks as short as possible.
Greetings peter
I need some advice on the Murata resonators sold by Parallax.
When I connect such a resonator to a PIC, are the outer pins of the DIP
resonator
connected to the OSC1 and OSC2 pins while the middle pin connects to GND?
Or ...
Do those resonators require any additional capacitors and if so, how do
these connect?
The PIC manuals state diferent capacitor values.
Is it possible to connect a single resonator to multiple PIC's that are up
to 8 inches apart,
or would it be better to supply each PIC with its own resonator, keeping
tracks as short as possible.
Greetings peter
Comments
I have used Murata resonators from Digikey, which are probably similar to
yours, (three leads). The center lead is gnded, while the outer leads
connect to Osc 1 and 2; no extra caps needed, they are in the resonator.
You need two extra caps if you use a crystal. My PIC books say to keep
leads short. Osc1 can be driven by an external clock oscillator, (Osc2 left
open), so you probably could drive multiple PICs with one external
oscillator.
Ray McArthur
> *********
> I need some advice on the Murata resonators sold by Parallax.
>
> When I connect such a resonator to a PIC, are the outer pins of the DIP
> resonator
> connected to the OSC1 and OSC2 pins while the middle pin connects to GND?
> Or ...
>
> Do those resonators require any additional capacitors and if so, how do
> these connect?
> The PIC manuals state diferent capacitor values.
>
> Is it possible to connect a single resonator to multiple PIC's that are up
> to 8 inches apart,
> or would it be better to supply each PIC with its own resonator, keeping
> tracks as short as possible.
GND. These resonators do not require the caps typically used with
crystals.
Regards
Rich
--- In basicstamps@y..., "Peter Verkaik" <peterverkaik@b...> wrote:
> Hi all,
>
> I need some advice on the Murata resonators sold by Parallax.
>
> When I connect such a resonator to a PIC, are the outer pins of the
DIP
> resonator
> connected to the OSC1 and OSC2 pins while the middle pin connects
to GND?
> Or ...
>
> Do those resonators require any additional capacitors and if so,
how do
> these connect?
> The PIC manuals state diferent capacitor values.
>
> Is it possible to connect a single resonator to multiple PIC's that
are up
> to 8 inches apart,
> or would it be better to supply each PIC with its own resonator,
keeping
> tracks as short as possible.
>
> Greetings peter
Thanks,.
Do you also know if a single resonator CAN be used on multiple PIC's
or would the clocksignal become too distorded to be usable, too much
(capacitive) load perhaps?.
Greetings peter
Oorspronkelijk bericht
Van: iceninevt@y... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=PLegSrFc8o5WK1Zl3zIV9pfze30fkxywvdG4MXxh00fuGfT-jraVLEuVq5M3hFFGC6o0FqYGGdyBSdQd0A]iceninevt@y...[/url
Verzonden: dinsdag 17 juli 2001 15:39
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] Re: Advice on Murata resonators
It is as you said, the outer pins to the OSC terminals, the center to
GND. These resonators do not require the caps typically used with
crystals.
Regards
Rich
--- In basicstamps@y..., "Peter Verkaik" <peterverkaik@b...> wrote:
> Hi all,
>
> I need some advice on the Murata resonators sold by Parallax.
>
> When I connect such a resonator to a PIC, are the outer pins of the
DIP
> resonator
> connected to the OSC1 and OSC2 pins while the middle pin connects
to GND?
> Or ...
>
> Do those resonators require any additional capacitors and if so,
how do
> these connect?
> The PIC manuals state diferent capacitor values.
>
> Is it possible to connect a single resonator to multiple PIC's that
are up
> to 8 inches apart,
> or would it be better to supply each PIC with its own resonator,
keeping
> tracks as short as possible.
>
> Greetings peter
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Some chips are designed to be used with a common oscillator. It is
often necessary that several devices use a common clock. One device
is used as the "master". The crystal or resonator is connected to
this chip. The chip then has an "osc out" pin. The "osc out" pin
supplies the clock pulses to the other chips.
The important thing is that the output of the crystal is a very
fragile thing.It must be buffered before being used. You can not
extend wiring from the crystal to various points around the PCB.
If you desire that multiple PIC's use a common clock you will have to
build one. The easiest way of doing this is to use a crystal timebase
IC, this buffers the crystal, the output of this device is a stream
of nice clock pulses. You could do it yourself- - crystal,
transistor, schmidt trigger. Anyway, there are timebases available
where everything is self contained in one DIP module. These can be
seen in the MOUSER catalog. they have a bunch of them available at
different frequencies. The output of the timebase will connect to the
PIC through one of its OSC pins. If OSC1 doesnt do it OSC2 probably
will.
I have had success doing this in similar situations, however I have
not tried this with a PIC. Still, I can see no reason why it wouldn't
work
Hope this helps
Regards
Rich
--- In basicstamps@y..., "Peter Verkaik" <peterverkaik@b...> wrote:
> Hi Rich,
>
> Thanks,.
> Do you also know if a single resonator CAN be used on multiple PIC's
> or would the clocksignal become too distorded to be usable, too much
> (capacitive) load perhaps?.
>
> Greetings peter
>
>
>
Oorspronkelijk bericht
> Van: iceninevt@y... [noparse][[/noparse]mailto:iceninevt@y...]
> Verzonden: dinsdag 17 juli 2001 15:39
> Aan: basicstamps@y...
> Onderwerp: [noparse][[/noparse]basicstamps] Re: Advice on Murata resonators
>
> It is as you said, the outer pins to the OSC terminals, the center
to
> GND. These resonators do not require the caps typically used with
> crystals.
>
> Regards
>
> Rich
>
>
>
>
> --- In basicstamps@y..., "Peter Verkaik" <peterverkaik@b...> wrote:
> > Hi all,
> >
> > I need some advice on the Murata resonators sold by Parallax.
> >
> > When I connect such a resonator to a PIC, are the outer pins of
the
> DIP
> > resonator
> > connected to the OSC1 and OSC2 pins while the middle pin connects
> to GND?
> > Or ...
> >
> > Do those resonators require any additional capacitors and if so,
> how do
> > these connect?
> > The PIC manuals state diferent capacitor values.
> >
> > Is it possible to connect a single resonator to multiple PIC's
that
> are up
> > to 8 inches apart,
> > or would it be better to supply each PIC with its own resonator,
> keeping
> > tracks as short as possible.
> >
> > Greetings peter
>
>
> To UNSUBSCRIBE, just send mail to:
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> Body of the message will be ignored.
>
>
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