Data Sheet

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72
The body of the MCP23008
The actual positioning of the pins is of course somewhat aesthetic and you may prefer to have
different groupings to those we have chosen.
Now that we’ve placed the pins we may need to adjust the size of the component body. If you
need to adjust the size of the component body to better fit. To do this, click on the Selection
Mode icon and simply left click on the edge of the component body, then left depress the mouse
on one of the nodes, drag to the new size and release the mouse to commit.
This works much like any other graphics package. For example, if you right click along the
bottom you can drag up and down and if you right click on an edge and you can drag
diagonally. Make sure however, that you do not leave any of the pins ‘hanging’ (not touching)
when you do this, else you will have to subsequently move the pins back onto the component
edge.
If you want to make fine adjustments you may need to adjust the Snap level – these
options are available from the View menu in Proteus (defaulted to 0.1in) and are
discussed in more detail in the reference manual.
Now that we have the basic shape of the part we need to add names to the pins. This can be
done as follows:
Right click on the pin at the top left of the component and select Edit Properties from the
resulting context menu.