Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
Page 1 / 2   >   >>
ThermalHunter
User Rank
Rookie
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
ThermalHunter   1/5/2012 6:36:44 PM
NO RATINGS
In the early 90's I worked for a company where long life (5 yrs at room temp, 2 years at -20C) was manditory from CR2430 coin cells in a high pulse\low average current regime. We developed a custom test which emulated the pused operation and so could predict battery lifetime. There were large (2:1 - 3:1) variations between manufacturers for the "same" battery. The discharge curves were like fingerprints; it was clear which "brands" were mearly OEM versions from other manufacturers.

studleylee
User Rank
Manager
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
studleylee   1/5/2012 5:14:14 PM
NO RATINGS
Good reference info guys. thanks to authors and commentators. -Lee

mema0
User Rank
Rookie
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
mema0   1/5/2012 4:22:59 PM
NO RATINGS
The TI link is: http://www.ti.com/lit/wp/swra349/swra349.pdf Using a capacitor in parallel is useful. However, remember that you have different states in Ble. The duty cycle is not the same in all states, which means that you have to make sure that you capacitor is properly loaded in cases several TX/RX activities are done at short intervals. So a smaller TX/RX current is also an advantage there.

bcarso
User Rank
Rookie
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
bcarso   1/5/2012 1:57:35 AM
NO RATINGS
Coin Cells and Peak Current Draw Texas Instruments Mathias Jensen White Paper September 2010 This is worth checking out. I can't post the link directly but it was also an EETimes featured article --- a Google search ought to be productive. Note that it discusses both capacitor optimization and differences among battery manufacturers. Brad Wood

zeeglen
User Rank
Blogger
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
zeeglen   1/4/2012 11:36:55 PM
NO RATINGS
I think the intent of the article is to show the response of the cell alone, not how to compensate. Yes, a capacitor would certainly help; that would be good information in a follow-on article.

Mac_H
User Rank
Rookie
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
Mac_H   1/4/2012 11:27:36 PM
NO RATINGS
These are results from one specific brand of batteries - it is worth remembering that it can change dramatically for different brands. We ran some tests and found that more complex battery packs with internal temperature sensors were even *faking* safety-critical data - the manufacturer had saved money by simply removing the temperature sensor and faking the results! The graphs (and photos of the internal teardown) are here: http://bit.ly/tCTPVC

gah4
User Rank
Manager
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
gah4   1/4/2012 11:09:37 PM
NO RATINGS
A reasonable-sized capacitor would help for very short pulses, but as the pulse length increases (at constant average current) the needed capacitor will eventually be too big. Well, one has to do the experiment to find where that point is.

bcarso
User Rank
Rookie
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
bcarso   1/4/2012 6:00:45 PM
NO RATINGS
You're not missing anything! It's astonishing that the authors don't even mention capacitors in parallel to improve performance, which is a time-honored strategy. I speak from personal experience, having determined optimal strategies for coil cell use in certain wristwatches, ones that use electromechanical displays. Brad Wood

jeremybirch
User Rank
CEO
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
jeremybirch   1/4/2012 5:00:55 PM
NO RATINGS
I am probably missing something here, but if the issue here is pulse current drain on the battery due to intermittent high current use, then surely most of the issues go away if there is a capacitor in parallel with the battery in some way? This way the pulse current comes from the capacitor (which has a much lower IR) and the battery has a long time to top the capacitor back up before the next pulse.

psi123
User Rank
Rookie
re: The impact of high pulse drain on CR2032 coin-cell battery capacity
psi123   1/4/2012 4:23:20 PM
NO RATINGS
They do not have to be tested all the time.

Page 1 / 2   >   >>


Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
5 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
27 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...