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8 USB Port
The UE910 includes one integrated universal serial bus (USB 2.0 HS) transceiver.
8.1 USB 2.0 HS
This port is compliant with the USB 2.0 HS only.
The USB FS is supported for AT interface and data communication.
The following table is listing the available signals:
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.
In case of a Firmware upgrade using the USB port, it could be done only using an USB 2.0 HS
device.
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