I made a 2560 core board, and I drive it with a 5 V power supply. I loaded a blink ino. But the chip feels hotter than a regular arduino 2560 board. And when I measure the current, it is around 200mA. I don't think there are anything much more than the bare chip.
The resonator is a regular 16MHz one, shown in some BOM of a regular 2560 R3. Is this something expected? Is there any thing I can do to improve this power efficiency like fuse setting?