I need some help understanding the dimensions specified in the datasheet of an FPGA.
I am trying to figure out the pad/ball dimensions. From looking at the schematic, it looks like theta_b is the diameter, but then what are the theta_d and theta_e values? Additionally what is the C, A, and B value? I couldn't seem to find any reference to those.
I used the autocad libraries and it appears to be the .5 mm, but would like to have a better understanding/explanation. Is theta_d the radius and theta_e maybe the height?