Leave trim pin of 1v reference IC open is ok?

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Yes, it says "TRIM/NC". That means that if you leave it unconnected the device will work without any external compensation.

Being curious, what application is that reference generator for?
 
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it will form the control voltage for a led driver ic...the ref actually gets fed to a digital pot which divides it down as required.
so we have variable output current.
 

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