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From: Jim Thompson
Subject: Re: Querry, Kick Starting Crystal Oscilator.
X-Newsreader: Forte Agent 1.91/32.564
Date: Fri, 08 Nov 2002 20:45:32 GMT
NNTP-Posting-Date: Fri, 08 Nov 2002 15:45:32 EST
Organization: Cox Communications
On 8 Nov 2002 12:29:49 -0800,
email@example.com (Tim Shoppa),
In Newsgroup: sci.electronics.design,
Entitled: "Re: Querry, Kick Starting Crystal Oscilator.",
Wrote the following:
|firstname.lastname@example.org (Roy McCammon) wrote in message news:<3DCA905A.59FD928B@mmm.com.DELETETHIS>...
|> I've got a processor with a 32KHz crystal. The problem
|> is that the crystal oscillator can take a l_o_n_g time
|> to start and stabilize.
|> My though is to build a 32KHz cmos schmidt trigger RC
|> oscillator and feed that through a small capacitance into
|> the input of the crystal oscillator to get it going.
|I think you'd be better off building your own 32kHz crystal oscillator
|and feeding it to the processor, rather than using the processor's
|oscillator. You suspect and/or know that your existing oscillator is
|flaky; ditching it (since you cannot change it) is the correct
|I originated a thread a few months ago and got some very good
|about excellent 32.768 kHz oscillators. See
I agree. A stand-alone 32KHz oscillator built around a 74HCU04 (note
the "U") can be made to be pretty low power.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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