Electronic – arduino – Max voltage for Arduino ATmega328 VCC pin (not raw!)

arduinoatmegavoltage

I am thinking about getting both the Pro Mini 3.3V and the 5V boards.

Example (but I may end up going generic, not sure yet)
3.3v: https://www.sparkfun.com/products/11114
5v: https://www.sparkfun.com/products/11113

Any way, I understand I can supply up to 12V of unregulated power through the RAW pins on both boards. But I need a very energy efficient set up since I'll be using batteries and I did some research that the voltage regulator wastes some power. Therefore, I'd like to send power direct to the VCC pin. What is the min/max voltage I can send through VCC for these two models? Is it exactly 3.3 and 5 respectively, no tolerance or margin? or is there some?

thanks!

Best Answer

Page 313 in the ATMEGA328P datasheet: Vcc 1.8V to 5.5V. Absolute maximum 6V, but then a lot of parameters are not specified.

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