Specifications

Appendix B I/O Interface Board
LittleBoard 550 QuickStart Guide 25
Table B-3. Utility 3 Interface Pin/Signal Descriptions (J9)
Utility 3 –J9
Pin # Signal
To Connector
& Pin #
Description
1 USB3PWR J13-A1
+5V USB Port Power – Port is disabled if this input is
low.
2 USB4PWR J13-B1
+5V USB Port Power – Port is disabled if this input is
low.
3USBP3- J13-A2
USB 3 Signal -
4USBP4- J13-B2
USB 4 Signal -
5USBP3+ J13-A3
USB 3 Signal +
6USBP4+ J13-B3
USB 4 Signal +
7 USB3GND J13-A4
USB Port ground
8 USB4GND J13-B4 USB Port ground
9 SHIELD3 J13-5 &6 USB Port shield (Cable Shield)
10 SHIELD4 J13-7 &8
USB Port shield (Cable Shield)
Notes: The shaded area denotes power or ground.