Target Power from AVR Programmer

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heinrichs.hj
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Posted by heinrichs.hj: Thu. Nov 1, 2007 - 11:40 PM
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Hi all,

I bought an AVRISP-MKII. Unfortunately, this programmer cannot provide the power for my target.
Does anybody here know a good portable progammer, that can provide power for my target?
My implementation uses ATmega48 controllers - the controller power will be isolated from the rest of the logic during programming.

Best regards,
HJ

Tags:

AVR Microcontrollers, megaAVR and tinyAVR, ATmega48
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Bronze Markjs
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Posted by js: Thu. Nov 1, 2007 - 11:46 PM
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How MUCH pwoer would be the question someone will ask you...

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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microcarl
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Posted by microcarl: Thu. Nov 1, 2007 - 11:55 PM
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Why would you want to power the target board from the ATAVRISP-MK2? The MK2 is not a power supply, it is a programmer and requires specific voltage information from the target - not supply the target with operating power. The MK2 is designed to see the target voltage and set up the internal ISP drivers to be compatible with operating voltage of the target.

Don't put the cart before the horse!!! Use an external power supply to power the target and, let the ATAVRISP-MK2 do its job - program the target...

You can avoid reality, for a while.  But you can't avoid the consequences of reality! - C.W. Livingston

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heinrichs.hj
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Posted by heinrichs.hj: Fri. Nov 2, 2007 - 12:08 AM
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Quote:
How MUCH pwoer would be the question someone will ask you...

Quote:
Why would you want to power the target board from the ATAVRISP-MK2?...

The required power is just the mega48 programming power. During programming, the mega48 power is isolated from the rest of the board logic (this isolation is automatically done by a P-MOS FET and two resistors as soon as the programmer power will be available).
In the lab I'm using an STK500, which provides the target power. I set the voltage level with AVR Studio 4.

BTW: To program the mega48 the board has to be completely unplugged from the system. That is why no power is available.

Best regards,
HJ

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