ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 47 of 98 2021-02-02
Communication ports
: It is suggested to add PCB test points at non-used module’s
UART, UART_AUX and USB (for products that support USB), it can be
useful to reflash, test and debug the application. Test points for UART
or USB are fine, however we recommend placing the pads for a
suitable connec
tor to port, for convenient access for network
certification testing and access during early development testing.
The USB connector can be “DNP” until needed. This may be more
convenient than just test points alone.
USB 2.0 HS
The ME910G1 includes one integrated universal serial bus (USB 2.0 HS) transceiver.
The following table lists the available signals:
USB differential Data (+)
USB differential Data (-)
VUSB AI Power sense for the internal USB transceiver.
Accepted range: 3.0V
to 5.5V
Table 19: Available Signals
The USB_DPLUS and USB_DMINUS signals have a clock rate of 480 MHz, therefore 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.
ESD protection can be added to USB D+/D- lines in case of external connector for cable
connection.
Proper components for USB 2.0 must be used.
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