Bricked ATTiny84

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Hi all,sorry if this is in wrong place ime new to this site and havnt a clue how to use it.

Ive a question,hear it is. I was programming an attiny84 and it had loose connections at the time sometimes it programed and somtimes not,now its bricked,is this due to the loose connection? ive now sorted the connection but it wont program,its not being seen,now if i use a high voltage programmer will it sort it out? its an attiny84 but in the qfn package,ive ordered a board so i can solder the chip on to it then connect it to my HVP.Will this reset it it to stock again? I have a few chips with this problem.I never new you could brick a chip if the programming is interupted with a loose connection,is this true do you think that thats what has caused it to brick?

Many thanks in advance for any help.

Last Edited: Fri. May 19, 2017 - 02:20 PM
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Look in the tutorial section of this site, there is a tutorial on how to "unbrick" you chip, and yes loose connections, loss of power, are just a few of the many ways to brick it.

 

Jim

 

Here you go: http://www.avrfreaks.net/forum/t...

 

 

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Hi jim,Thanks for clearing that up,i did think so,makes sence realy,i suppose it corrupts the fuse bits  does it? And can it be fixed with a HVP?

Thanks again jim.

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Yes, just about anything can be fixed using a HVP, but few of us use or have one any more.

 

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Hello,

 

Be aware of a failure mode with loose connections - if the power or ground is loose then the chip can derive it's power from the external signals and that can fry the chip after some period of time.  Speaking from experience......

 

Hugh