Actually, as BruceMcLaren points out, we are not talking about Ohm's Law here, where the voltage is applied to a fixed impedance (R or Z). We are talking about I=CdV/dt, the charging of capacitances. So P = VI and P = V * C * dV / dt where the dV would equal V, since the internal logic swing for the MCU will be rail to rail. and 1/dt is the frequency. So now you have P = V * C * V * f or P = V^2 * f * C
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For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This discussion will examine what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.