LTE Standard Module Series
EC200T Series Hardware Design
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3.9. USB Interface
EC200T 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 serves 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 12: Pin Description of USB Interface
Pin Name Pin No. I/O Description Comment
USB_DP 69 IO USB differential data (+)
Require differential
impedance of 90 Ω
USB_DM 70 IO USB differential data (-)
Require differential
impedance of 90 Ω
USB_VBUS 71 AI USB connection detect Typical 5.0 V
GND 72 Ground
For more details about the USB 2.0 specifications, please visit http://www.usb.org/home
.
It is recommended to reserve test points for debugging and firmware upgrade in your designs. The
following figure shows a reference circuit of USB interface.
Figure 18: Reference Circuit of USB Application
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