Application Interfaces; Usb Interface - Quectel UMTS Series Hardware Design

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Application Interfaces

4.1. USB Interface

UC200A-GL provides one integrated Universal Serial Bus (USB) interface which complies with the USB
2.0 specification and supports full-speed (12 Mbps) and high-speed (480 Mbps) modes. The USB
interface can only serve as a slave device and is used for AT command communication, data transmission,
software debugging and firmware upgrade. The following table shows the pin definition of USB interface.
Table 11: Functions of the USB Interface
Functions
AT command communication
Data transmission
Software debugging
Firmware upgrade
Pin definition of the USB interface is here as follows:
Table 12: Pin Definition of USB Interface
Pin Name
USB_VBUS
USB_DP
USB_DM
UC200A-GL_Hardware_Design
Pin No. I/O Description
71 AI USB connection detect
69 AIO USB differential data (+)
70 AIO USB differential data (-)
UMTS/HSPA+ Module Series
YES
YES
YES
YES
Comment
Typ. 5.0 V.
If unused, keep it open.
90 Ω differential impedance.
USB 2.0 compliant.
If unused, keep it open.
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