Quectel RM500Q-AE - Page 37

5G Module Series
RM500Q-AE&RM502Q-AE Hardware Design
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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 sentence output, software debugging,
firmware upgrade and voice over USB*.
Please note that only USB 2.0 can be used for firmware upgrade currently.
The following table shows the pin definition of USB interface.
Table 10109: Pin Definition of USB Interface
“*” means under development.
For more details about the USB 3.1 & 2.0 specifications, please visit http://www.usb.org/home.
The USB 2.0 interface is recommended to be reserved for firmware upgrade in designs. The following
figure shows a reference circuit of USB 3.1 & 2.0 interface.
Pin No.
Pin Name
I/O
Description
Comment
7
USB_DP
AI/AO
USB 2.0 differential data bus (+)
Require differential
impedance of 90 Ω
9
USB_DM
AI/AO
USB 2.0 differential data bus (-)
29
USB_SS_TX_M
AO
USB 3.1 transmit data (-)
31
USB_SS_TX_P
AO
USB 3.1 transmit data (+)
35
USB_SS_RX_M
AI
USB 3.1 receive data (-)
37
USB_SS_RX_P
AI
USB 3.1 receive data (+)
NOTE