Question

Can I use separate or different voltages to power each side of the isolation barrier?

Can I use the Si86xx as a level shifter?

Answer

Absolutely!

Each side of the isolation barrier is powered independently of one another.

Example: You can run a unit with VDD1 = 5.0 V, and VDD2 = 3.3 V, or vice versa.

 

So long as VDD1 and VDD2 remain within the specified range (see the data sheet's electrical specification table) you will be fine running them at different potentials.

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