Atmela ICE supply IC burned out

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#1
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Please could you please help me to repair my Atmel ICE bord ?

That small supply IC up side of main MCU (when USB port is on left side) almost melted away and I want to buy a new IC to replace it. Could someone please write me there those letters?

I can only see:
  **J

  *2J
  R5DD
stars represents letters which cannot be red.

Thank for help...

Atmel-ICE
Atmel Studio 7.0

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IIRC, there is one thread about a severe malfunction of its power supply; pictures with a work-around.

Could replace the PCBA instead of repair :

http://new.microchipdirect.com/productsearch.aspx?Keywords=ATATMEL-ICE-PCBA

https://octopart.com/search?q=atatmel-ice-pcba&avg_avail=(1__*)&start=0

 

One way to totally or partially destroy an Atmel-ICE and/or PC/notebook is to drop a conductor into the target such that the USB VBUS or ground over-currents.

A USB isolator will limit the damage.

Most USB isolators are USB full-speed though there are several USB high-speed isolators.

 

"Dare to be naïve." - Buckminster Fuller

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I thought PC USB power draw was current limited.

 

I also thought power supply chips on boards would limit the power.

 

Maybe I've just been lucky.

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Yes current is limited but when the power supply chip desided to go wrong, 0.5A is enough to destroy it.
I removed its burned body and coil (to do not left it there one side unconected) and replaced it with an linear non-switching 3-pin regulator from 5V - USB to 3.3 which is needed for MCU.
Works pretty well :)

 

Atmel-ICE
Atmel Studio 7.0

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 So does the ICE change it's VCC to match the MCU VCC?

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Yes

Atmel-ICE Main Board

http://www.atmel.com/webdoc/GUID-DDB0017E-84E3-4E77-AAE9-7AC4290E5E8B/index.html?GUID-11CB875B-461E-4F25-A26B-5CCD1D06BDCE

...

The VTG pin is used as a reference input only, and a separate power supply feeds the variable-voltage side of the on-board level converters.

...

(from previous page)

USB, UC3A4, level conversion, filters and protection, power supply, buffer from power supply to level converters

"Dare to be naïve." - Buckminster Fuller

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The UC3A4 - Main MCU of ICE is still powered by 3.3V. Only output circuits are matched to VTG.

And if the voltage which supply MCU is lower than 3.3V, for example 3V, it still works but readed VTG is bigger, so they use supply voltage for AREF... :/ I think its not best solution, when internal band gap source is also availible.
But replacment with non-switching 0.1A stabilisator is working without any problems....

 

 

Atmel-ICE
Atmel Studio 7.0

Last Edited: Wed. Sep 20, 2017 - 05:50 PM