In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Bean,

for my "KISS" calculation, I just took the 275 ľA, Paul mentioned. I agree, the SX is not simply a resistor, i.e. power consumption vs supply voltage is not a linear function at all.

I support your idea using a diode (or two in series) for reducing the supply voltage instead of using an LDO regulator. The regulator would dissipate similar power as the diode would do for dropping down the voltage plus some additional power "eaten" (i.e. converted to heat) by the regulator's internal circuity.

Nevertheless, this all is a bit of guesswork. Although the SX datasheets present various diagrams showing the relationship between supply voltage, Idd drawn, and clock frequencies, it would be an idea to analyze this in more detail by measuring some "real" SXes under various conditions. I'd really like to do it if I'd only had the time...

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