USB AVR!!!

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:?: IS there any USB AVR in an DIL or DIP package?
Or it doesn't have to be AVR, it could be 51 but it has to support ISP.
Thankz.

There are pointy haired bald people.
Time flies when you have a bad prescaler selected.

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I believe someone has written USB code to run on an AVR, but I don't think that there is much you could do with it. I think even the slowest USB protocol is about as much as the AVR could handle. However, there are several USB<->Serial converters available that could be wired up, and I'm pretty sure it would be relatively simple.

Last Edited: Fri. Jan 7, 2005 - 07:42 PM
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FTDI makes the FT245 chip that is pretty quick... easily interfaces with any AVR. There are a couple manufacturers that put the FT245 on a DIP socket and they run about $25 a piece.

Check out http://www.ftdichip.com/

Last Edited: Sat. Jan 8, 2005 - 02:58 AM
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When I do USB for AVR, I use SiLabs CP2101 (now CP2102) which requires fewer external parts than the FTDI part. This device is in a MLP package, but I've been able to solder it with solder paste and a toaster oven.

And since you don't care if its an AVR (shame on you) you might check out a new part from Microchip which supposedly will fit your needs, but I haven't looked at it too deeply.

Good Luck,
Smiley

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I've always laughed a little when I hear someone doing reflow soldering with a toaster oven, just seems kind of ironic that in todays high tech world things like that work :)

-Curiosity may have killed the cat
-But that's why they have nine lives

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smileymicros wrote:
but I've been able to solder it with solder paste and a toaster oven.

Cool! How could you do that?

"Chill out with Atmel Corp."
- Scud88.

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scud88 wrote:
smileymicros wrote:
but I've been able to solder it with solder paste and a toaster oven.

Cool! How could you do that?

Take one ordinary cheap toaster oven and scratch "Poison do not use for food" on the top so it will never be reused for food. Purchase a syringe of AMTECH solder paste from Howard Electronics. Purchase a $30 multimeter with a 500 degree fahrenheit thermocouple probe from Sears. Practice controling the toaster oven temperature while watching the multimeter temperature reading until you can duplicate the reflow curve for the solder (you will overshoot, so practice is necessary--but it isn't hard to master). Put a thin strip of the solder paste over the pads. Don't worry about getting it perfect as the surface tension of the solder and the adhesion of the pads will draw the solder into the right postion. Watch carefully as you cook your device, you'll see the organics boil off right before the solder melts. After a few times you'll be watching for the solder melt as the true indicator more than watching the temperature.

Beleive it or not, this is eaiser than it sounds and a lot easier than hand soldering SMT, IMHO, and a lot cheaper than any alternative I've seen.

Good Luck,
Smiley

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That toaster oven method sounds usefull.

However, soldering fine pitched smd is quite easy if you luse Litze wire.
Litze is meshed copper with a dry substance in it that attracks solder.

If you first let the smd pads flood with solder, then when its cooled down hold the litze wire onto the flooded pads and holder a big tip iron, 1 to 3mm into the litze. The solder runs into the litze and the pads become clear but still are soldered propperly.

MY MICROCONTROLLER CAN BEAT THE HELL OUT OF YOUR MICROCONTROLLER /ATMEL

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MaxK wrote:
Litze wire.

This would work for the FTDI part, but the CP2101 is in a MLF package with no leads, the connections are just pads under the chip at the edge, so I don't think this would work for them.

Smiley

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Ohh those packages :D

Those can be nasty to solder indeed.

MY MICROCONTROLLER CAN BEAT THE HELL OUT OF YOUR MICROCONTROLLER /ATMEL

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MaxK wrote:
Litze wire.

Sorry for the off-topic, but I have to know: is this another name for the solder wick? If not, what is it and where can it be purchased? Thank you.

Bogdan

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Solder wick is same type of mesh/braid copper wire used for desoldering as I reffered to yes.

Some languagual differences.

MY MICROCONTROLLER CAN BEAT THE HELL OUT OF YOUR MICROCONTROLLER /ATMEL