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Hi, I want to project controller board powered by 2 AAA batteries. It should have power down-wake up functionality (for long battery life) and serial communication. Are there any low power supply versions with 8032 core or better use a high efficiency step up regulator (than I could use my 5V programming environment).
Also check out the MAX3223. It's designed for battery power systems and has a self-shutoff and wakeup feature that powers the chip down to around 1uA when not in use. If your system spends most of the time in idle mode, this is your best bet. If serial activity is pretty much non-stop, the auto power off\on feature isn't really necessary.