Telit Wireless Solutions CE910-DC, Hardware User'S Manual, Page: 37 / 67

The CE910 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
B15
USB_D+ I/O USB differential Data(+)
C15 USB_D- I/O USB differential Data(+)
A13 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 CE910 or
customer specific requirements from ESD event to USB lines (B15, C15 and A13).