The SMD command is used to add pads for surface mount devices to a package. When the SMD command is active, an smd symbol is attached to the cursor. Pressing the left mouse button places the smd pad at the current position and attaches a new smd symbol to the cursor. Entering numbers changes the x- and y-width of the smd pad, which can be up to 0.51602 inch (13.1 mm). These parameters remain as defaults for succeeding SMD commands and can be changed with the CHANGE command. Only even values should be used. Pressing the center mouse button changes the layer onto which the smd pad will be drawn, and the right mouse button will rotate the smd pad. The SMD command is active until ';' (or another command) is entered.
Roundness
The roundness has to be entered as an integer number between 0 and 100, with a negative sign to distinguish it from the width parameters. A value of 0 results in fully rectangular smds, while a value of 100 makes the corners of the smd fully round. The command
SMD 50 50 -100 '1' *for example would create a completely round smd named '1' at the given mouseclick position. This can be used to create BGA (Ball Grid Array) pads.
Names
SMD names are generated automatically and may be modified with the NAME command. Names may be included in the SMD command if enclosed in single quotes.
Single Smds
Single smd pads in boards can only be used by defining a package with one smd.
Alter Package
It is not possible to add or delete smds in packages which are already used by a device, because this would change the pin/smd allocation defined with the CONNECT command.
Index | Copyright © 2001 CadSoft Computer GmbH |