Another fried dragon

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okay, so I did it, I fried my dragon but fried dragons have never been my favorite. Simply told, it seems like that it cant read back from the device, so question is, does anyone know what cind of candies is mounted on the board? i.e. the small 6p sot(?) packages. I mean I have heard its a simple dual transistor and i guess I am not the first to fry dragons, so before I go ahead purchasing another one Id better ask if you might have some experience.

Regards
Vidar (Z)

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"The fool wonders, the wise man asks"

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zainka wrote:
so before I go ahead purchasing another one Id better ask
If I had a dragon that died from normal use (which there seems to be reports of), I'd think about buying something more robust if a replacement was needed. The AVRISPMkII is nice because it's about the same price as a dragon (but no debugging) and the JTAGICEMkII is nice because it's also robust like the AVRISPMkII and will debug any AVR or AVR32.

Anyway, hopefully someone will chime in and will know of a fix for your dragon.

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Generally fried dragons are best served with hot sauce, spanish rice and a nice salad. :lol:

Sorry to hear your pet died

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

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Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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Quote:
it cant read back from the device
Have you tried ANOTHER device or board? Were you using DW with that device?

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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Yes I have tried two other devices on same bord (this is a prototype using DIP), and I have tried three other projects using different MCUs. On this very project I was using mega32, hence Jtag and not DW. One of the other boards have a tiny2313, but I cant make it to enter DW mode since ISP wont work. I guess DW actually would work but I do not have any DW enabled devices here now.

jgmdesign wrote:
Generally fried dragons are best served with hot sauce, spanish rice and a nice salad. Laughing

I think a flux sauce with tin dip will do better...

Regards
Vidar (Z)

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"The fool wonders, the wise man asks"

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There are two 6 pin devices that are found on the Dragon's hide. The parts marked 1Ft are BC847BS, a dual NPN part(symetrically packaged so no pin 1 marker), while parts marked 13t are BC847BPN, a complementry NPN-PNP part. These are used on the STK500 as well. Both are cheap.

Usually one or both of the 8-pin parts marked AHD (NLAS2066D) goes before one of the transistors dies. Be sure that this is not the case. These will affect JTAG and/or debug wire.

With the above information and some chicken soup you should have your dragon back on all fours in no time.

"It's easier to ask forgiveness than it is to get permission" - Admiral "Amazing" Grace Hopper.

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The NLAS2066D is available form Digikey as NLAS2066USGOSCT-ND @ $0.99 each.

BC847BPN is available at Digikey as
568-1634-1-ND @ $0.22 each.

BC847BS is available at Digikey as
BC847BS-TPCT-ND @ $2.00 for a min qty of 10

I'm going to add them to my next order.

I don't use the Dragon very frequently but it is the only device I have that will do HV programming.

The AVRISPMkII and the AVRJTAGICE MkII do not and I found it handy on several ATMega168's that got there fuses confused with DW... :roll:

Dyan...KV9R

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Thanks, all. Ill order some of these and try it out..

Regards
Vidar (Z)

----------------------------------------------------------

"The fool wonders, the wise man asks"

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This thread is pretty old, but it was the one that pointed me in the right direction so I'll post here. It seems that the NLAS2066 is not very readily available in May 2009...Digikey, Mouser, Jameco, Arrow all either don't stock it, are out of stock, or want you to buy the reel.

I picked up a few TS5A23166 from Digikey (296-17906-1-ND $1.05) to fix my recently fried dragon and they seem to do the job well. I wound up replacing both. The first one I replaced (closest to the jtag connector) didn't fix the problem, replacing the second one did. So I don't know if the first one was actually OK or if they both were broken.

The TS5A23166 does not have over-voltage tolerant inputs, but I'm not sure if that's ever a problem on the Dragon.

Phil

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zainka wrote:
jgmdesign wrote:
Generally fried dragons are best served with hot sauce, spanish rice and a nice salad. Laughing

I think a flux sauce with tin dip will do better...

At work I've recently been using Kester TSF-6522 tacky flux. It smells effing delicious. I kid you not. I would describe it as brownies in the oven mixed with a little caramel. Others have described it as brown sugar. Others as maple syrup.

A colleague tasted it. Apparently it only smells good.

It also works great.