Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice User Guide Preparing a design for simulation October 2019 184 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Unmodeled pins If you see messages like these in the PSpice Simulation Output window, Warning: Part part_name pin pin_name is unmodeled. Warning: Less than 2 connections at node node_name. or messages like this in the PSpice output file, Floating/unmodeled pin fixups then you may have drawn a wire to an unmodeled pin. The PSpice libraries include parts that are suitable for both simulation and board layout. The unmodeled pins map into packages but have no electrical significance; PSpice ignores unmodeled pins during simulation. Check for this Are there connections to unmodeled pins? If so, do one of the following: ■ Remove wires connected to unmodeled pins. ■ If you expect the connection to affect simulation results, find an equivalent part that models the pins in question and draw the connections. To find out more about searching for parts, see Finding the part that you want on page 144. Missing ground This problem applies to analog-only and mixed-signal circuits. If for every net in your circuit you see this message in the PSpice output file, ERROR -- Node node_name is floating. then your circuit may not be tied to ground.