Uart To Usb Interface - Sierra Wireless AirPrime XS1110 Product Technical Specification

9

9: UART to USB Interface

If the Sierra Wireless module you have purchased does not come with a USB
interface, it is possible to connect the module to an external USB IC. To further
enhance the transferring speed, use one that is capable of USB version 2.0. Once the
driver for the chosen USB Bridge IC is successfully installed in Windows or another
operating system, the USB Bridge IC will automatically be recognized as a COM port.
Note: A proper driver must be installed for the USB to be recognized by the operating system.
Please refer to the reference circuits in Figure 9-1 below for the conversion. A
CP2102 IC is used here as an example.
Figure 9-1: UART to USB
Pin 29 and Pin 30 are the bottom ground pads which are not documented in the IC
datasheet. You may ignore these two pins in the drawing.
Rev 4.0 Jul.20 47 41113354