SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 System description Page 41 of 157
The module itself acts as a USB device and can be connected to a USB host such as a Personal Computer
or an embedded application microprocessor equipped with compatible drivers.
The USB_D+/USB_D- lines carry USB serial bus data and signaling according to the Universal Serial Bus
Revision 2.0 specification [4], while the VUSB_DET input pin senses the VBUS USB supply presence
(nominally 5 V at the source) to detect the host connection and enable the interface. Neither the USB
interface, nor the whole module is supplied by the VUSB_DET input, which senses the USB supply voltage
and absorbs few microamperes.
☞ The USB interface is available as AT command / data communication interface only if an external valid
USB VBUS supply voltage (5.0 V typical) is applied at the VUSB_DET input of the module since the
switch-on of the module, and then held during normal operations. In this case, the UART will be not
available.
☞ If the USB interface is enabled, the module does not enter the low power deep sleep mode: the external
USB VBUS supply voltage needs to be removed from the VUSB_DET input of the module to let it enter
the Power Saving Mode defined in 3GPP Rel.13.
The USB interface is controlled and operated with:
AT commands according to 3GPP TS 27.007 [6], 3GPP TS 27.005 [7]
u-blox AT commands (see the SARA-R4/N4 series AT Commands Manual [2])
The USB interface of SARA-R4/N4 series modules can provide the following USB functions:
AT commands and data communication
Diagnostic log
The USB profile of SARA-R4/N4 series modules identifies itself by the following VID (Vendor ID) and PID
(Product ID) combination, included in the USB device descriptor according to the USB 2.0 specifications [4].
VID = 0x05C6
PID = 0x90B2
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