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Topic: ATmega2560 Cooling Circuit (Read 660 times) previous topic - next topic

UptownKitten

Hello, I am just curious: does the ATmega2560 processor have a on board cooling circuit? Like, how does the Arduino Mega 2560's processor stay cool?

Thanks,

UptownKitten

UptownKitten

This is for a science project, in biology, I am comparing parts of an animal cell to an Arduino Mega 2560. Also, I couldn't find anything about a cooling circuit in the datasheets, so I decided to ask here.

Datasheet

Another Datasheet

CrossRoads

It doesn't get that hot to start with.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

UptownKitten


CrossRoads

Heat comes from transistors switching. Mega doesn't have that many (compared to the microprocessor in a PC) and it doesn't switch that fast, only 16 MHz, while PC processors switch at speeds like 3.2 GHz, 200 times faster.

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

CrossRoads

If you look at Section 32 of the datasheet, there are charts showing current draw under various conditions and power supply voltage.

For example, the 2nd chart shows current draw for  16 MHz clock under an "Active" condition.
Current draw, Icc, at 16 MHz, is 20mA.

Power = current x voltage, so 0.02A x 5V = 0.1W, 100mW, so not very hot, not very warm even.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

UptownKitten


westfw

As a very rough estimate, the power dissipation of a chip (how much heat it generates), is going to be proportional to the number of transistors that make up the chip.
An ATmega128 is estimated to have about 1 million transistors (and an ATmega2560 perhaps twice that, in that it has twice as much memory; some estimates are much lower), and runs at about 0.1W.   A modern Intel Core i7 runs about 1.5 billion transistors, so 1000x the power consumption (~100W) is about right.

https://www.embeddedrelated.com/showthread/comp.arch.embedded/14362-1.php
https://en.wikipedia.org/wiki/Transistor_count



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