Application Interfaces; Usb Interface - Quectel EC200A Series Hardware Design

4

Application Interfaces

4.1. USB Interface

EC200A series 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
For more details about the USB 2.0 specifications, please visit http://www.usb.org/home.
Pin No. I/O
71 AI
69 AIO
70 AIO
YES
YES
YES
YES
Description
USB connection detect
USB differential data (+)
USB differential data (-)
LTE Standard Module Series
Comment
Typ. 5.0 V.
If unused, keep it open.
90 Ω differential
impedance. USB 2.0
compliant.
If unused, keep it open.