Usb Interface - Quectel EM06 Series Manual

3.8. USB Interface

Each EM06 series module provides one integrated Universal Serial Bus (USB) interface which complies
with USB 2.0 specifications and supports high speed (480 Mbps) and full speed (12 Mbps) modes on USB
2.0. The USB interface is used for AT command communication, data transmission, GNSS NMEA
sentences output, software debugging, firmware upgrade and voice over USB*.
The following table shows the pin definition of USB interface.
Table 10: Pin Definition of USB Interface
Pin Name Pin No.
USB_DP 7
USB_DM 9
For more details about the specifications of USB 2.0, please visit this website down below:
https://www.usb.org/document-library/usb-20-specification.
The USB interface is recommended to be reserved for firmware upgrade. The following figure shows a
reference circuit of USB 2.0 interface.
Module
EM06_Series_Hardware_Design
I/O Description
IO USB 2.0 differential data bus (+)
IO USB 2.0 differential data bus (-)
Minimize these stubs
R1
USB_DM
R2
USB_DP
GND
Figure 18: Reference Design of USB 2.0 Interface
Test Points
NM_0R
R3 NM_0R
R4
ESD Array
0R
0R
LTE-A Module Series
EM06 Series Hardware Design
Comment
Require a differential impedance
of 90 Ω
USB_DM
USB_DP
GND
MCU
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