Le 14 mars 2015 à 19:01, Pete Stephenson p...@heypete.com a écrit :
On Sat, Mar 14, 2015 at 12:56 PM, Mike Cook michael.c...@sfr.fr wrote:
If true, what is the maximum current that can be
safely supplied by the pin? As above, is it safe to use a
non-rechargeable battery like a CR2032?
On Sat, 14 Mar 2015 12:56:05 +0100
Mike Cook michael.c...@sfr.fr wrote:
Anyway. Using a CR2032 is OK, at least with my hardware and you get backup
for at least 4 years.
A CR2032 is a quite huge coin cell. An NVRAM module does not use much
power once Vcc goes to zero. In todays low power
att...@kinali.ch said:
A CR2032 is a quite huge coin cell. An NVRAM module does not use much power
once Vcc goes to zero. In todays low power modules it's in the order of
100nA max specified. You can assume it to be somewhere in the range of 10nA
(probably package leakage limited) and 1uA
Hi
The “old almanac” issue is *very* normal for early Oncore modules. Some
(possibly custom) firmware times out a stored almanac after
searching for X hours (minutes?). The original firmware did not time out. You
can sit there for a *long* time with a bad almanac ….
The real issue is the lack
I agree with Atilla from what I have seen. Its actually somewhat difficult
to measure this level of current. But all is not lost. Even if the unit is
drawing 1-10ua because something is going wrong. Simply add a battery
holder and 2 X AAA or AA or ...
Whatever it takes to keep the unit going.
If
Hi,
On 03/11/2015 10:37 PM, Tom Van Baak wrote:
[5] An Algorithm to Synchronize the Time of a Computer to Universal Time,
by Levine, 1995
http://tf.boulder.nist.gov/general/pdf/1064.pdf
This is a nice read, but re-applying it to NTP alters the behavior of
the noise sources and I question
I have one of these UT+ receivers. Backup is not a big deal. How long
will the power be off? Certainly not for days and weeks. The backup
battery only has to last a few seconds or maybe an hours or two. The real
problem with batteries is not how much energy they store but shelf life.
You have
On 3/15/2015 8:46 PM, Chris Albertson wrote:
I have one of these UT+ receivers. Backup is not a big deal. How long
will the power be off? Certainly not for days and weeks. The backup
battery only has to last a few seconds or maybe an hours or two. The real
problem with batteries is not
On Sun, 15 Mar 2015 03:27:06 -0700
Hal Murray hmur...@megapathdsl.net wrote:
att...@kinali.ch said:
A CR2032 is a quite huge coin cell. An NVRAM module does not use much power
once Vcc goes to zero. In todays low power modules it's in the order of
100nA max specified. You can assume it to
On Sun, 15 Mar 2015 11:05:53 -0400
paul swed paulsw...@gmail.com wrote:
I agree with Atilla from what I have seen. Its actually somewhat difficult
to measure this level of current.
It's not that difficult. You just need a good DMM. Standard ones
will not work as they have resolution limits in
Hi
For a one off / home use application - enter the local “position hold” info
into your
code. Let the micro send it up to the Oncore ….You will be hitting the
“compile”
button enough times already that one more isn’t going to slow you down much.
Bob
On Mar 15, 2015, at 3:46 PM, Chris
csteinm...@yandex.com said:
The Energizer AA and AAA lithium primary batteries (Li/FeS2) have a shelf
life exceeding 10 years,
Like many things, it's temperature dependent.
A classic trick is to store batteries in your freezer. Aside from better
shelf life, you can probably find them in
Atilla
Nor do I expect them to last 10 years, more like 1-2 years if the units
drawing the currents mentioned. Being external they are easy to change and
measure. Also cheap.
Only do this on boards that can't be replaced etc.
Regards
Paul
On Sun, Mar 15, 2015 at 6:40 PM, Attila Kinali
Attila wrote:
A CR2032 is usually of LiMnO2 chemistry, while AA/AAA's
are usually ZnMnO2. Also coin cells are optimized for long life times,
with very little current drawn, while most AA/AAA are not, or not as much.
Ie, i wouldn't expect an AAA cell, and much less an AA cell to last 10 years.
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