The heating up is slight; temperature of the two parts is maybe a bit less than 40 degrees Celsius. But still trying to diagnose for future reference... The layout is simple: --PCB with an Atmega2560V (Arduino bootloader, 3.3V, 8Mhz) and an Series 1 Xbee-Pro (50 mA to 215 mA current draw). --Made…

What could be possible reasons for Atmega-chip and Xbee heating up?

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