HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 72 of 111 2019-11-25
9. USB PORT
The HE910 includes one integrated universal serial bus (USB 2.0 HS) transceiver.
USB 2.0 HS Description
This port is compliant with the USB 2.0 HS.
The USB FS is supported for AT interface and data communication.
The following table is listing the available signals:
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:
Figure 9-1 ESD8V0L2B-03L
NOTE:
VUSB pin should be disconnected before activating the Power
Saving Mode.
In case of a Firmware upgrade using the USB port, it could be done
only using an USB 2.0 HS device.
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