[time-nuts] Using GPS 1PPS for accurate period measurement

Azelio Boriani azelio.boriani at screen.it
Fri Dec 2 18:12:51 EST 2011


Man, what should we follow if not the manufacturer datasheet? Everyone can
predict that the best results are obtained following the component's
datasheet. Indeed maybe, after having followed the datasheet, that you can
improve something.

On Fri, Dec 2, 2011 at 11:51 PM, Kevin Rosenberg <kevin at rosenberg.net>wrote:

> On Dec 2, 2011, at 10:59 AM, Hal Murray wrote:
> > I've been playing with one of the Dallas DS32KHZ parts.  I'm guessing
> you are
> > [...]
> > Another possibility is that I didn't ground the NC pins.  (I didn't
> notice
> > that in the data sheet until I read it again looking for crap like that.)
>
> Using a DS1306, I found the ground plane was essential for a stable 32768
> Hz
> signal. I tried a number of ground planes in a proto board I was building.
> Who
> would have predicted that the best results came from the ground plane that
> was
> described in the 1306 datasheet. Lesson: before using a DS32KHz, I'll
> definitely
> connect the "NC pins" (sic) to ground as specified in the datasheet.
>
> > You might try a pair of tvb's picPETs.
>
> +1E3 on tvb's picPETs! Thanks, Tom!
>
> Kevin
>
>
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