User's Manual

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 39 of 78

5.5 Communication ports

USB 2.0 HS

The UE910 includes one integrated universal serial bus (USB 2.0 HS) transceiver.

The following table is listing the available signals:

PAD

Signal

I/O

Function

Type

NOTE

B15

USB_D+

I/O

USB differential Data (+)

3.3V

C15

USB_D-

I/O

USB differential Data (-)

3.3V

A13

VUSB

Power sense for the internal USB

transceiver.

Accepted range:

4.4V to 5.25V

The USB_DPLUS and USB_DMINUS signals have a clock rate of 480 MHz.

The signal traces should be routed carefully. Trace lengths, number of vias and capacitive loading

should be minimized. The characteristic impedance value should be as close as possible to 90 Ohms

differential.

In case there is a need to add an ESD protection, the suggested connection is the following:

NOTE:

VUSB pin should be disconnected before activating the Power Saving Mode.