User Guide

ME910G1 HW Design Guide

1VV0301593 Rev.7 Page 47 of 98 2021-02-02

Communication ports

Note: 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 connector 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:

PAD

Signal

I/O

Function

NOTE

B15

USB_D+

I/O

USB differential Data (+)

C15

USB_D-

I/O

USB differential Data (-)

A13

VUSB

Power sense for the internal USB transceiver.

Accepted range: 3.0V

to 5.5V

100K pull down

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.