Quote Originally Posted by ardhuru View Post
Sorry to jump in late. Just tie a 4.7 K between the serin pin and ground; should solve the problem.
Oh...hey...good point...no kidding.
Jeez, sometimes the simplest fixes are the best.
And if tying it to ground doesn't work (which it should), tie it high, or maybe use a 10K instead of a 4.7K, or maybe a 1K. Might take a bit of experimentation. But I don't see why 4.7K shouldn't work just fine.