User Manual

element14 is a trademark of Premier Farnell plc 104

Figure 69 Connector Pin Insertion Depth

To calculate the amount of the pin that extends past the Point of Contact, use the following

formula:

Overhang=Total Pin Length- PCB thickness (.062) - contact point (.079)

The longer the pin extends past the contact point, the more force it will take to insert and

remove the board. Removal is a greater issue than the insertion.

8.5 Signal Usage

Based on the pin muxing capabilities of the processor, each expansion pin can be

configured for different functions. When in the stacking mode, it will be up to the user to

ensure that any conflicts are resolved between multiple stacked cards. When stacked, the

first card detected will be used to set the pin muxing of each pin. This will prevent other

modes from being supported on stacked cards and may result in them being inoperative.

Section 7.1

of this document, the functions of the pins are defined as well as the pin

muxing options. Refer to this section for more information on what each pin is. To simplify

things, if you use the default name as the function for each pin and use those

functions, it will simplify board design and reduce conflicts with other boards.

Interoperability is up to the board suppliers and the user. This specification does not

specify a fixed function on any pin and any pin can be used to the full extent of the

functionality of that pin as enabled by the processor.