User's Manual

CL865-DUAL Hardware User Guide
1vv0301104 Rev.1 – 2014-03-07
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 37 of 70
Mod. 0805 2011-07 Rev.2
8. USB Port
The CL865 module includes a Universal Serial Bus (USB) transceiver, which operates at
USB Full-speed (12Mbits/sec) and slave mode only.
It is compliant with the USB 2.0 specification and can be used for diagnostic monitoring,
control and data transfers.
The table below describes the USB interface signals:
Pin
Signal
I/O
Function
Type
18
USB_D+
I/O
USB differential Data(+)
17
USB_D-
I/O
USB differential Data(+)
16
USB_VUSB
I
Power for the internal USB transceiver
5V
The USB_DPLUS and USB_DMINUS signals have a clock rate of 60MHz. The signal traces
should be routed carefully. Trace lengths, number of vias and capacitive loading should be
minimized. The impedance value should be as close as possible to 100 Ohms differential.
The table below describes the VUSB specification:
Parameter
Min
Max
Input voltage
4.4V
5.0V
Input current
50mA
-
WARNING:
Consider a mechanical design and a low-capacitance ESD protection device to protect CL865
or customer specific requirements from ESD event to USB lines (Pin16, Pin17 and Pin18).