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Electronics => Electronics => Topic started by: Metal Slug 2 on February 10, 2009, 11:13:12 PM

Title: Life time expectancy of an Atmega8 (or similar)? (solved)
Post by: Metal Slug 2 on February 10, 2009, 11:13:12 PM

I was just wondering.....if you were to for example use a $50 robot board with an Atmega8 and have it hooked up to a continuous 6v power supply, program in for example a 'stampy' algorithm and run if 24/7.  How long would the circuit survive for (or more specifically, the Atmega8), assuming there is no disrupting interference with it?

Title: Re: Life time expectancy of an Atmega8 (or similar)?
Post by: householdutensils on February 10, 2009, 11:17:24 PM

From the Datasheet:
 

Quote

Data retention: 20 years at 85°C/100 years at 25°C

That value is defined as:

Quote

Reliability Qualification results show that the projected data retention failure rate is much less
than 1 PPM over 20 years at 85°C or 100 years at 25°C.

I don't know if that's what you want, but it seems relevant :D

Title: Re: Life time expectancy of an Atmega8 (or similar)?
Post by: householdutensils on February 10, 2009, 11:19:55 PM

Sorry!! Hit the quote button instead of the modify button  :-X

Title: Re: Life time expectancy of an Atmega8 (or similar)?
Post by: Metal Slug 2 on February 11, 2009, 01:16:23 AM

Wow, thats much longer than I expected!  Awesome, :)
Thanks.

Title: Re: Life time expectancy of an Atmega8 (or similar)? (solved)
Post by: Admin on February 11, 2009, 08:56:11 AM

Depends on how much you write to memory. RAM will fail after so many rewrites, check the datasheet. I think the number was in the millions or billions.

EEPROM will fail after about ~100,000 rewrites.

Of course this follows a bell curve, not an exact number.

Title: Re: Life time expectancy of an Atmega8 (or similar)? (solved)
Post by: pomprocker on February 11, 2009, 10:54:57 AM

the hardware aspect may also fail. Not sure how long servos can survive after constant use

EDIT:  But like any good technician attending to a piece of machinery, there is always scheduled preventative maintenance.

Title: Re: Life time expectancy of an Atmega8 (or similar)? (solved)
Post by: Admin on February 15, 2009, 05:51:30 AM

Quote

the hardware aspect may also fail. Not sure how long servos can survive after constant use

good question!
http://www.societyofrobots.com/robotforum/index.php?topic=1300.0