I have purchased a batch of Attiny85s from Aliexpress. I normally use USBTiny device to program my Attiny85s. But these chips from Aliexpress could not be programmed in the usual way.
I built a circuit on a perfboard for high voltage programming using an Arduino Uno. My problem is that I can reset the fuses of my other Attiny85s but not of my new chips from Aliexpress. Can I say that the new chips are faulty or is there another way to recover them?
Thank you very much for your suggestions and help.

 

Not sure if this helps -

https://electronics.stackexchange.c...ting-fuse-bits-with-hv-programmer-doesnt-work

https://arduinodiy.wordpress.com/2015/05/16/high-voltage-programmingunbricking-for-attiny/



Regards, Dana.

 

Thank you very much for your help. I will check the links ASAP...

 

They cannot be programmed with either ISP or high voltage programming? Can you read the device signature (ID)?
If it does not act like a known-read, known-good ATTINY85 I would assume the chips are either defective or some other device that was relabeled.

 

They cannot be programmed with either ISP or high voltage programming? Can you read the device signature (ID)?
If it does not act like a known-read, known-good ATTINY85 I would assume the chips are either defective or some other device that was relabeled.

I also think that they are relabeled chips because the device signature is 0!

 

I don't use that chip, but I always like to read about these issues when they come up - probably to get it clear in my head that saving money sometimes costs a great deal

Have you seen this thread? It seems to contain a lot of information on the issue.

 

I also think that they are relabeled chips because the device signature is 0!

I have a few samples from the ATMEL locker I could send if you PM me.

 

I have a few samples from the ATMEL locker I could send if you PM me.
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Thank you very much. I have purchased from local dealers.

I don't use that chip, but I always like to read about these issues when they come up - probably to get it clear in my head that saving money sometimes costs a great deal

You are right but you know, this is called "experience"!

Have you seen this thread? It seems to contain a lot of information on the issue.

Thanks a lot. I have read the thread and then thrown away the 20 faulty chips.

 

Buying from a local (authorized) source is a good move.

You might feel a little better about the experience if you Widlarize the chips. The analog IC engineer Bob Widlar would give faulty chips special treatment to make sure they would never caused him problems again.

 

Buying from a local (authorized) source is a good move.

You might feel a little better about the experience if you Widlarize the chips. The analog IC engineer Bob Widlar would give faulty chips special treatment to make sure they would never caused him problems again.
View attachment 167048

Noooo! I do not like such brutal solutions. I have more advanced plans like connecting 220V to the chips. You know. It is recommended to use high voltage programming to reset bricked microcontrollers. I don't think 12V is really a "high voltage"!

 

Great idea! I guess they will be permanently reset.