Service Guide

LTE-A Module Series
EM060K-GL&EM120K-GL_Hardware_Design 39 / 78
4.2. USB Interface
The module provides one integrated Universal Serial Bus (USB) interface which complies with the USB
3.0 and 2.0 specifications and supports super speed (5 Gbps) on USB 3.0 and 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 sentence output, software debugging, firmware upgrade (USB 2.0 only),
and voice over USB*.
Table 14: Pin Definition of USB Interface
For more details about the USB 3.0 and 2.0 specifications, please visit http://www.usb.org/home
.
The following figure presents a reference circuit for the USB 3.0 and 2.0 interface.
Host Module
USB_DM
USB_DP
USB_SS_RX_P
USB_SS_RX_M
USB_SS_TX_P
USB_SS_TX_M
BB
USB_DM
USB_DP
USB_SS_RX_P
USB_SS_RX_M
USB_SS_TX_P
USB_SS_TX_M
9
7
37
35
31
29
TVS array
Test Points
Minimize these stubs in PCB layout.
C5 100 nF
C6 100 nF
C1 100 nF
C2 100 nF
R1 0 Ω
R2 0 Ω
R3 NM-0Ω
R4 NM-0Ω
Figure 18: Reference Circuit for the USB 3.0 and 2.0 Interface
Pin No. Pin Name I/O Description Comment
7 USB_DP AIO USB differential data (+)
Require differential
impedance of 90 Ω
9 USB_DM AIO USB differential data (-)
29 USB_SS_TX_M AO USB 3.0 super-speed transmit (-)
31 USB_SS_TX_P AO USB 3.0 super-speed transmit (+)
35 USB_SS_RX_M AI USB 3.0 super-speed receive (-)
37 USB_SS_RX_P AI USB 3.0 super-speed receive (+)