User's Guide
LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 – Preliminary • 2015-09-02 33 of 68
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Communication ports
USB 2.0 HS
The LE866 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
E5
USB_D+
I/O
USB differential Data (+)
3.3V
E6
USB_D-
I/O
USB differential Data (-)
3.3V
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: