UE866 HARDWARE USER GUIDE
1vv0301157 Rev.12
•
2017-02-10
33 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
5.5
Communication ports
USB 2.0 HS
The UE866 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
D4
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.
Содержание UE866-EU
Страница 70: ......