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Dallas DS3231 RTC; known stability/accuracy issues?

M

Michael

Jan 1, 1970
0
This device is billed as "Extremely Accurate" and with stability +-2ppm (at 0 to 40C). Everything
I've read in the data sheet - features as well as stability - fills the bill for my uses. However,
having read several reports in the past about poor stability of DS32KHZ (accurate 32KHz source), I
feel somewhat wary about the claims made for DS3231. Yes, I could just run some tests... but this
is no jelly bean; DigiKey gets US$7+ apiece in singles. Getting samples seems to be out of the
question; Dallas has never sent samples of anything I requested, presumably because I am not a
company.

So, does anyone here have first-hand experience with DS3231 and care to share? I'd be interested
to hear about:
1) short/long-term stability
2) accuracy
3) ease/difficulity/impossibility of synching the RTC's Freq-Out to a primary timing source's Second
pulse.
4) any functional characteristics that were unexpected, anomalous.
 
M

Michael

Jan 1, 1970
0
Upon reflection, I think my original post sounds like a solicitation of comments that I will
substitute for doing testing myself. It isn't. I certainly will test it, eventually, but I don't
want to invest any time and effort in this part if it has known problems that render it unsuitable
for my uses. Sorry for any misunderstanding.
 
J

Jean-Yves

Jan 1, 1970
0
This device is billed as "Extremely Accurate" and with stability +-2ppm (at 0
to 40C). Everything
I've read in the data sheet - features as well as stability - fills the bill
for my uses. However,
having read several reports in the past about poor stability of DS32KHZ
(accurate 32KHz source), I
feel somewhat wary about the claims made for DS3231. Yes, I could just run
some tests... but this
is no jelly bean; DigiKey gets US$7+ apiece in singles. Getting samples
seems to be out of the
question; Dallas has never sent samples of anything I requested, presumably
because I am not a
company.

So, does anyone here have first-hand experience with DS3231 and care to
share? I'd be interested
to hear about:
1) short/long-term stability
2) accuracy
3) ease/difficulity/impossibility of synching the RTC's Freq-Out to a primary
timing source's Second
pulse.
4) any functional characteristics that were unexpected, anomalous.

sorry for you but dallas (in fact maxim) is as far as I know the only
company that sends samples even to private no company user without
asking anything !!!
 
M

Michael

Jan 1, 1970
0
Jean-Yves said:
sorry for you but dallas (in fact maxim) is as far as I know the only
company that sends samples even to private no company user without
asking anything !!!


That sure makes me feel good ...... not!

Actually, each of my requests for DalSemi samples went out some years ago, to DalSemi. It was long
before Maxim entered the DalSemi picture.

The only DalSemi stuff that I receive in the mail is unsolicited brochures sealed in plastic mailing
bags, and never about a device that interests me.
 
J

Jean-Yves

Jan 1, 1970
0
That sure makes me feel good ...... not!

Actually, each of my requests for DalSemi samples went out some years ago, to
DalSemi. It was long
before Maxim entered the DalSemi picture.

The only DalSemi stuff that I receive in the mail is unsolicited brochures
sealed in plastic mailing
bags, and never about a device that interests me.

so if it was years ago, please try a sample request to maxim.com and
wait 10 days or so before asking here again ?
it seems you're in the usa so not a "forbidden" country for them to send
samples.
I never tried samples from dalsemi but for sure it was really old...;)
best regards,
 

jamesy

Mar 22, 2010
1
Joined
Mar 22, 2010
Messages
1
The Rpu(pull up resistor) value of SCL and SDA signal must be matched of DS3231 and the MCU signal, I use about 100 ohms for so called extremely accurate timing before for 11.059MHz crystal of AT89S52 before, u can try
 
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