Schematic of the AVR ISP mkII

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Hello, has somebody schematic of the AVR ISP mkII. I have two of them, they are damaged due to high voltage on their pins (one ic is surely destroyed - is burned out) and I want to try to repair them. Thanks to everyone, who has this info.

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I don't believe it is available for the AVRISP Mk2, unless someone did the drawing himself by looking at and tracing the board.

There is a block diagram in the help file of Studio (2. Hardware Description) but it's pretty useless.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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Would the chip that burned be the one in the top left corner, when the 6 pin interface is at the top. if so, I have a burned one also !!

Rusty

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It is chip near to coil and two capacitors are near to this chip, I think it is power source chip.

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shark82 wrote:
It is chip near to coil and two capacitors are near to this chip, I think it is power source chip.

Wow, I have 2 units with this problem.
Marking code BDR, I think it's a step up switching regulator.
¿Someone knows where can I found one like this? I didn't find reference.
Thank you.

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Maybe TPS61020DRC

Stealing Proteus doesn't make you an engineer.

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OK, finally I found it. It's a Texas Instrument step up.
TPS61020DRC adj 1.5A, marking code BDR.
I'm going to replace it (farnell or digikey) and test the programmers.

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ArnoldB wrote:
Maybe TPS61020DRC

Thank you!

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I have the same problem with may AVR mkII. But I would like to ask if you replace it by TPS61020DRC ? Did it work? are you sure of the part no is TPS61020DRC.

Thanks,

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I am facing same problem of damaging AVRISP mkII due to high voltage .Is it possible to Trouble shoot the same to identify damaged part. :lol:

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Hi - I'm having the same issue!
Did your new part work?
If so, I have 2 AVRISP mkII programmers here that I'll fix...

I would also like to know what causes this part to blow.

Josh

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The regulator is a TPS61020DRCR, and replacing it will probably fix a broken AVRISP mkII (at least it always worked for me).

I don't know exactly what exactly causes this part to blow, but I think most of the times I blew mine some overvoltage was involved...
Be aware that the GND of the ISP-connector is connected to the GND of the USB-connector.

And, if someone has a schematic of the AVRISP mkII, I would be interested anyway, because I think the protection circuit on the ISP-connector is well done. :-)

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Wow - you must have some good soldering skills! :wink:
That part is tiny with the pads underneath....
I attempted to replace it but upon powering up, it just started smoking again.

What I did discover is that there was 6VAC between the USB ground and the ISP ground, and this is what was causing the problem. This 6VAC was generated by my faulty power supply.

Josh

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Not surprised about the TPSxxxx . They are forever blowing on TomToms due to over volatge (12v).