the presentation is now over and would like to say thanks to sir warren for a GREAT & EXCELLENT presentation...well informative and i have learned alot for the lecture...
now, i will go for day 5 lecture to finish the whole class session. thanks also to digikey and design news for giving us the opportunity to attend the continuing education...thanks to all...
slide 10 - you name your own 'power use profile' terms that are not in step with vendors names?? Seems to add yet another level of confusion ...
RUN -->> ACTIVE??
...
...
DEEP SLEEP -->> STANDBY??
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Low power is very important for the reasons stated in class 1 as well as environmental and social reasons relating to energy use and lifestyle social determinants. An interesting and perhaps, at first glance, 'fun' application is monitoring or controlling temperature in a refrigerated vehicle I suppose. Perhaps there are bragging rights for keeping Eskimo pies at constant and sub-zero temperatures driving across the desert. Perhaps a better total energy efficiency is to eliminate the application.
Good engineers, being good citizens and wise stewards of the planet's energy sometimes might want to consider recommendations for a broader conservation of energy and resource utilization at the higher system levels.
@John- Shelf life was included on my slide since I just did a screen capture of the Energizer video. They probably include it since it is important to their end customers- probably not as important to us as designers (unless our designs have batteries in them and then sit on the shelf for a long time in inventory. Seems like it would be uncommon however.
@John- The currents in Table on slide 12 are estimates from the data sheet. These can be measured using a number of techniques- ammeter, capacitor to via a shunt resistor and a scope. There are issues with each of these techniques I cover in a previous class so take a look at previous PPTs/audios if you want more details.
On batery capacity that varies with drain rate- you are correct and it can be difficult to use manufacturers data (typically in graph form as you say) but it is possible to do some estimates that 'bound' the lifetime using these graphs. Not as accurate as you might wish, but should be accurate enough for most applications (you should be able to show that you can run for at leasy 2 years- for example- but may not be able to say exactly how much longer than 2 years).
So the avg current can be determined. But to find lifetime you need to know the real battery capacity. Data sheets won't tell you the capacity directly, because a batteries capacity (mAh) varies tremendously with the drain rate. Even if they give a graph it's on a low resolution log-log scale and it's practically impossible to determine the capacity at YOUR load -- especially if your load varies, for example if current varies with battery voltage. How do you know a battery's capacity?
On the topic of 22-year battery life, Jack Ganssle wrote a good article about the (multi-)decade from a coin cell claims from manufacturers. His take was that things like the capacitor leakage (which I see is mentioned in this PPT) and other possible nanoamp leaks (also I would add, like Warren just did, battery life and self-discharge) make multi-decade runtimes on coin cells more or less impossible.
The mcu is only one part, and sometimes a small part, of the power puzzle.
Haven't previously used. Was using power from USB. Now trying to decide between AA and coin. Size is a factor, but current draw to implement Wifi or Bluetooth is a factor
AA Alkaline, lithium coin cell, lithium-ion rechargeable cell packs. Each was driven by the needs of the products it went in from smoke detectors, to cellular radio devices.
Also- I forgot to include the link to the Battery Video from Energizer in the reference section of the PPT deck. here it is so you can find it easily: Clickable Link
While you are waiting feel free to post any questions you have from previous classes or topics you are most interested in about todays topic- Extending battery lifetime. I will try and address them during todays class.
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For 3D printing to make the jump from rapid prototyping to manufacturing, engineers will need to find easier ways to move products from their CAD screens to their printers.
Gigabit and PoE are two networking technologies moving ahead in tandem as industrial users power remote Ethernet devices such as IP security cameras at 1,000 Mbps over existing CAT5 cable.
New versions of BASF's Ecovio line are both compostable and designed for either injection molding or thermoforming. These combinations are becoming more common for the single-use bioplastics used in food service and food packaging applications, but are still not widely available.
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