provide separate ICE voltage to VTG

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#1
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I have a custom PCB with an Atmega 328 on it. The board is in a rack with other boards CPU i/O ect.

 

Of course when I switch off the rack power I lose my ICE power also. Can I provide a seperate ATMEL ICE voltage to the VTG that remains on when I switch the rack power off with the caveats above? 

 

Currently the rack CPU and my board are kind of asyncronous when it powers up.  I would like to have debug code ruinning when I power the rack.

 

Thoughts?

Last Edited: Thu. Dec 7, 2017 - 01:12 AM
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mikey1 wrote:
Can I provide a seperate ATMEL ICE voltage to the VTG that remains on when I switch the rack power off with the caveats above?
No

Atmel-ICE

Powering the Atmel-ICE

http://www.microchip.com/webdoc/GUID-DDB0017E-84E3-4E77-AAE9-7AC4290E5E8B/index.html?GUID-EB8D4B08-EEB9-439E-9A78-2F44A120C416

mikey1 wrote:
Thoughts?
Atmel-ICE on an off-rack self-powered USB hub (it and hub's power load is likely acceptable)

"Somehow" hold the CPU until the mega328 is running with Atmel-ICE.

Some MCU are a board controller such that control the power sequencer (order, durations)

 

Edit: URL

 

"Dare to be naïve." - Buckminster Fuller

Last Edited: Thu. Dec 7, 2017 - 03:15 AM
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mikey1 wrote:
Of course when I switch off the rack power I lose my ICE power also

I don't follow the "of course" there.

 

Probably because I don't follow your description of the setup.

 

Can I provide a seperate ATMEL ICE voltage to the VTG that remains on when I switch the rack power off

I find that sentence confusing - I think some parentheses are needed.

 

Rather than try to describe it in words, a diagram is usually clearer ...