SJ4 Pin in JP2 Pin Header in Main Board Version 3

[AliMoh]

Hi every body.
In docs it's said that the pin SJ4 is for resolver feedback unipolar:
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Alternatively Pin 1 and 3 can be connected to a sin/cos feedback device and Pin 4 can generate a resolver excitation sine wave. In that case Pin 2 provides 1.7V to make the resolver feedback unipolar.
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What does it mean "resolver feedback unipolar" ? I didn't get it. I want to use EVB90380. Should I Connect SJ4 to a port in EVB90380 ?

[johu]

No, this is just needed for actual resolvers as they output like +/-1V. Your chip likely outputs between 1-3V or something, so unipolar already