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XT55 AVL User’s Guide 
Confidential/Released 
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XT55_avl_ug_V03 
Page 35 of 37 
28.06.2004 
4.3 Digital Inputs 
The input pins (pin 20 – GPIO 15, pin 30 – GPIO 3) of the 80-pin board-to-board connector 
are pre-defined as digital inputs. 
These input pins can be connected to the CMOS +3.3V DC. The figure below illustrates how 
to connect these inputs. 
 
 
 
 
 
 
 
 
 
 
Figure 12: Connection example for GPIO 15 and GPIO 3