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ATmega2560 board overheating any idea's

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HendriXML:
TO 220 washers can probably be used when screwing this board down, without concerns about shorting or hurting the board in other ways.

maginnovision:

--- Quote from: SiliconWizard on September 27, 2019, 11:14:27 pm ---Don't overclock your Atmega's!! :-DD

--- End quote ---

I overclocked a 2560 to 24MHz with no issues. Batch of 20. However trying beyond 24MHz exactly 0 worked. 50% overclock though not bad. Not even a glitch despite using external SRAM(and on board xmm) and uSD Card with fatFS. It's more about testing than just not doing it.

magic:
That's low. I have two projects which run AT90USB162 at 36MHz (but only one unit tested). Above that the USART starts to give up :D

60mA seems quite a lot, measure the other board for comparison.

maginnovision:

--- Quote from: magic on September 28, 2019, 06:54:30 am ---That's low. I have two projects which run AT90USB162 at 36MHz (but only one unit tested). Above that the USART starts to give up :D

60mA seems quite a lot, measure the other board for comparison.

--- End quote ---

That's pretty good! I couldn't get any of the big megas to even startup beyond 24MHz. Even changing the voltage they wouldn't run at 25MHz.

magic:
Maybe smaller ones are better.

I found this thread while researching OC-bility of AVRs ;D
https://www.avrfreaks.net/comment/2425576#comment-2425576

I could swear I have also seen a video of somebody running a trivial LED blinker clocked from a function gen and pushed it to some 50MHz but I don't remember which chip it was. Of course such code doesn't exercise much of the peripherals or even RAM.
Some people say flash may be the bottleneck.

By the way, IIRC I also got ATmega32U4 to run at 27MHz with USB support, using some weird PLL division factors. Or maybe it was using the internal oscillator to clock USB :scared:
USB clock frequency was quite off per the USB spec, but USB2.0 hosts (at least those in computers) are very tolerant of clock skew at USB1.x speeds due to the massive oversampling afforded by a 480Mb/s PHY processing a 12Mb/s signal.

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