Usb Interface - Quectel BG96-NA Hardware Design

In order to enhance the reliability and availability of the (U)SIM card in applications, please follow the
criteria below in (U)SIM circuit design:
 Keep layout of (U)SIM card as close to the module as possible. Keep the trace length as less than
200mm as possible.
 Keep (U)SIM card signals away from RF and VBAT traces.
 Assure 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 awayfromeach other and
shield them with surrounded ground.
 In order to offer good ESD protection, it is recommended to add a TVSdiode array which parasitic
capacitance should be not more than 50pF. The 22ohmresistors should be added in series between
the module and the (U)SIM card so as to suppress EMI spurious transmission and enhanceESD
protection. The 33pFcapacitors are used for filtering interference of GSM900.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 areapplied, and should be placed close to the (U)SIMcard connector.

3.10. USB Interface

BG96-NA contains one integrated Universal Serial Bus (USB) transceiver which complies with the USB
2.0 specification and supports high-speed (480Mbps) and full-speed (12Mbps)modes. The USB interface
is used for AT command communication, data transmission, software debugging and firmware upgrade.
The following table shows the pin definition of USB interface.
Table 10: Pin Description of USB Interface
Pin Name Pin No.
USB_VBUS 8
USB_DP 9
USB_DM 10
GND 3
More details about the USB 2.0 specifications, please visithttp://www.usb.org/home.
The USB interface is recommended to be reserved for firmware upgrade in your design. The following
figure shows areference circuit of USB interface.
BG96-NA_Hardware_Design
I/O Description
PI Used for detecting the USB connection.
IO USB differential data bus (+)
IO USB differential data bus (-)
Ground
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LTE Module Series
BG96-NA Hardware Design
Comment
Typical 5.0V
Require differential
impedance of 90Ω.
Require differential
impedance of 90Ω.