MSC CX-MB-EVA2 user manual USB Topology, USB Power Supply

CX-MB-EVA2 User's Manual Hardware

4.12USB Topology

Eight USB ports are provided by the COM Express module.

The exact assignment of each port is defined in the following table:

USB-Port	References	Beschreibung
USB0	X29	External dual connector 1
USB1	X29	External dual connector 1
USB2	X30	External dual connector 2
USB3	X30	External dual connector 2
USB4	X31	External dual connector 3
USB5	X31	External dual connector 3
USB6	X32	External dual connector 4
USB7	X32	External dual connector 4

Table 19 Assignment USB Ports

4.12.1USB Power Supply

The power supplies are protected by USB power switches. In addition the input voltages of the USB power switches are protected by resettable fuses.

The USB power switches have the following functions:

￿The output current is limited to 500mA per port

￿A signal to detect overcurrent is generated for each two ports

￿USB0 and USB1 have one common signal to detect overcurrent

￿USB2 and USB3 have one common signal to detect overcurrent

￿USB4 and USB5 have one common signal to detect overcurrent

￿USB6 and USB7 have one common signal to detect overcurrent

Specification:

￿References: X29 - X32

￿ Connector: AMP 787617-2 (Dual USB connector type A)

￿Pinout: according to USB specification 2.0 [10]

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