USB AVR ISP Adaptor With Digital Isolation.

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UNiXWHoRe
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Posted by UNiXWHoRe: Thu. Jun 12, 2008 - 07:33 PM
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Hello freaks!

I came upon an extremely easy programmer that works with AVRdude and uses the COM port, the old ISP Adaptor ( http://elm-chan.org/works/avrx/a... ), and I decided to make a home-brew version of it including a digital isolator (ADuM1411: http://www.analog.com/en/prod/0,... ) and using a FT232RL USB-UART chip...

I post here the schematic, a board layout with gerbers and BoM, all made this morning... ;) I haven`t tested this, however it should be fully compatible with the regular serial port ISP adaptor, plus it has the ability to work with 3.3v or 5v targets at the change of a jumper, and the ISP side of the isolator can also be powered from either USB or the target. It sports both the standard 6-pins and 10-pins ISP headers, and has some LEDs for show... The whole thing is surface mount.

I would appreciate any commments, suggestions, and corrections, I hereby release this freely for anyone willing to make em... ;)

Attachment(s): 

File AVR-Less USB-ISP.rar

Tags:

AVR Microcontrollers, megaAVR and tinyAVR
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UNiXWHoRe
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Posted by UNiXWHoRe: Sat. Jun 14, 2008 - 06:36 PM
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So, no interest whatsoever in this? I thought a tiny portable USB isp programmer that escapes the traditional chicken in the egg problem that traditional "intelligent" ISP programmers have, and works with standard AVRdude, while providing an electrically safe connection to the target with configurable levels would raise some interest...

This is just a first version too, if there is something you dislike about this adaptor, I would love to hear the flames as well... ;)

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DocJC
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Posted by DocJC: Sat. Jun 14, 2008 - 11:51 PM
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Quote:
I haven`t tested this, however it should be fully compatible with the regular serial port ISP adaptor

This sounds like a great project.

I was just reserving comment until the above became: "I tested this and it works Great!"

On my bench, at least, there has been an occassional project that did not pan out quite as originally planned!

JC

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