LTE-A Module Series
EG06 Hardware Design
EG06_Hardware_Design 44 / 89
In order to enhance the reliability and availability of the (U)SIM card in applications, please follow the
criteria below in the (U)SIM circuit design:
Keep placement of (U)SIM card connector to the module as close as possible. Keep the trace length
as less than 200mm as possible.
Keep (U)SIM card signals away from RF and VBAT traces.
Make sure the ground between the module and the (U)SIM card connector short and wide. Keep the
trace width of ground and USIM_VDD no less than 0.5mm to maintain the same electric potential.
To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away from each other and
shield them with surrounded ground.
In order to offer good ESD protection, it is recommended to add a TVS diode array of which parasitic
capacitance should not be more than 50pF. The 22
Ω resistors should be added in series between the
module and the (U)SIM card to facilitate debugging. Please note that the (U)SIM peripheral circuit
should be close to the (U)SIM card connector.
The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout trace
and sensitive occasion are applied, and should be placed close to the (U)SIM card connector.
3.10. USB Interface
EG06 provides one integrated Universal Serial Bus (USB) interface which complies with the USB 3.0/2.0
specifications and supports super speed (5Gbps) on USB 3.0, 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 output, software debugging, firmware upgrade and voice over USB*.
The following table shows the pin definition of USB interface.
Table 10: Pin Description of USB Interface
Pin Name
Pin No.
I/O
Description
Comment
USB Signal Part
USB_DP
34
IO
USB 2.0 differential data bus - plus
Require differential
impedance of 90Ω
USB_DM
33
IO
USB 2.0 differential data bus - minus
USB_VBUS
32
PI
Used for detecting the USB connection Typical 5.0V
USB_ID
36
DI
OTG identification
USB_SS_
TX_P
38
AO
USB 3.0 super-speed transmit - plus
Require differential
impedance of 90Ω