Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 System description Page 31 of 119
• FW upgrades by means of the u-blox EasyFlash dedicated tool
• Trace log capture (diagnostic purposes)
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.
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☞ 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.
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☞ 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