LE910Cx mPCIe Hardware Design Guide
1VV0301510 Rev. 13 Page 41 of 73 2021-07-07
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Plus (+) line of the differential, bi-directional USB signal to/from the
Table 19: USB Interface Signals
Note: USB_VBUS controlled internally by TGPIO_10. For
disabling/enabling use at commands via UART port. For example:
at#gpio=10,0,1 will disable USB_VBUS
at#gpio=10,1,1 will ebable USB_VBUS
For more information follow 80407ST10116A, LE9x0 AT Command
User Guide.
Note: Even if USB communication is not used, it is still highly
recommended to place an optional USB connector on the application
board. At least test points of the USB signals are required since the
USB physical communication is needed in the case of SW update.
6.6.2. Serial Port
The serial port is typically a secondary interface between the LE910Cx-mPCIe module
and OEM hardware. MODEM SERIAL PORT 1(Main) is available on LE910Cx-mPCIe
adaptor
Several configurations can be designed for the serial port on the OEM hardware.
The most common configurations are:
• RS232 PC com port
• Microcontroller UART @ 1.8V (Universal Asynchronous Receive Transmit)
• Microcontroller UART @ 3.3V/5V or other voltages different from 1.8V
Depending on the type of serial port on the OEM hardware, a level translator circuit may
be needed to make the system operate. The only configuration that does not need level
translation is the 1.8V UART.
The levels for LE910Cx UART are the CMOS levels as described in 6.1 Logic Levels
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