Operating arduino at voltage less than 3.3V ?

Projects General Guidance
1

Hi,

I have been working on atmega 328 and using it as an arduino pro mini.
I would like to whether I can use my atmega 328 at voltage 2.8V, as the datasheet of atmega 328 says its operational voltage is 1.8V -5.5V .
Also if it is possible, I would like to know whether for bootloading atmega 328 using arduino mega 2560 I need to use level shifters for SPI connection between Atmega 328 and Arduino 2560. Also for flash programmer using ft232 along with level shifter will do the same?

Thank you,

Zeeshan

2

The ATmega328p will operate at 8 MHz down to 2.4V so if you are running at 8 MHz you can run it on 2.8V.

If you are running at 16 MHz you should use at least 3.78V.