User's Manual

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.2 Preliminary • 2015-08-04 41 of 81
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5.5 Communication ports
5.5.1 USB 2.0 HS
The LE910 V2 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
AI
Power sense for the internal USB
transceiver.
5V
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.