mITX-SSH-S - User Guide, Rev. 1.0
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6.4.
USB Connectors (I/O Area) (CN22 & CN23)
The external I/O connector panel supports two dual USB 3.0 connectors.
USB3.0 ports are backward compatible with USB2.0.
Figure 7: USB 3.0 Connector CN22, CN23
Table 12: Pin Assignment USB 3.0 Connector CN22, CN23
Pin
Signal
Note
1
+USB_VCC
+5 V Supply for USB device
2
USB_D-
USB 2.0 Differential Pair (-)
3
USB_D+
USB 2.0 Differential Pair (+)
4
GND
5
USB_RX-
USB 3.0 Rx. Differential Pair (-)
6
USB 3.0 Rx. Differential Pair (+)
7
GND
8
USB_TX-
USB 3.0 Tx. Differential Pair (-)
9
USB 3.0 Tx. Differential Pair (+)
Table 13: Signal Description
Signal
Description
, USB_TX-,
, USB_RX-,
USB_D+, USB_D-
Differential pair works as serial differential receive/transmit data lines.
+USB_VCC
5 V supply for external devices. VCC is supplied during power-down to allow wakeup on
USB device activity. Protected by a 1A current limiting IC covering each of the USB port.
For HiSpeed rates it is required to use a USB cable, which is specified in USB 2.0 standard:
Figure 8: USB 2.0 High Speed Cable
On-Twisted Power Pair: Red: V
bus
Black: Power Ground
Inner Shield Aluminum
Metallized Polyester
28 AWG Tinned Copper Drain Wire
Polyviny Chloride (PVC) Jacket
Twisted Signaling Pair:
White: D- Green: D+
Outer Shield ≥ 65% Interwoven
Tinned Copper Braid
