I am trying to create a QFN pkg for a TI part. Here are the details.
1) 4 pins on a side with 0.5mm pitch
2) pad size of 0.28x0.85 mm
The problem I am confronting is that all the dimensions are such that I need to constantly change grid resolution. But for example when I create 4 of the pins on a side with 0.5mm grid and change the grid so I can create another side's 4 pins (2.1 mm away), I CANNOT measure that distance since the MARK command only works on grid lines and the pads are not aligned to any grids.
Question 1: What is the proper way to do this when a whole bunch of dimensions are used and require different grid resolutions.
Question 2: Is there a way to create a pad that is round on one end ?
many thanks in advanced.