User's Manual

CE910-DUAL Hardware User Guide
1vv0301010 Rev .0 – 2012-07-10
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7. USB Port
The CE910-DUAL module includes a Universal Serial Bus (USB) transceiver, which operates
at USB Full-speed (12Mbits/sec).
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
VBUS I Power sense 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 90 Ohms differential.
WARNING:
Consider a mechanical design and a low-capacitance ESD protection device to protect
CE910-DUAL or customer specific requirements from ESD event to USB lines (B15, C15
and A13).