Product Info

LPWA Module Series

BG95 Series Hardware Design

BG95_Series_Hardware_Design 47 / 106

 Keep the placement of (U)SIM card connector as close to the module as possible. Keep the trace

length as less than 200 mm 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 0.5 mm to maintain the same electric potential.

Make sure the bypass capacitor between USIM_VDD and USIM_GND less than 1 μF, and place it as

close to (U)SIM card connector as possible. If the system ground plane is complete, USIM_GND can

be connected to the system ground directly.

 To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away from each other and

shield them with surrounded ground. USIM_RST should also be ground shielded.

 In order to offer good ESD protection, it is recommended to add a TVS diode array with parasitic

capacitance not exceeding 15 pF. In order to facilitate debugging, it is recommended to reserve

series resistors for the (U)SIM signals of the module. The 33 pF capacitors are used for filtering

interference of EGSM900. 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.



1. eSIM function is optional. If eSIM is selected, then the external (U)SIM cannot be used

simultaneously.

2. BG95-M5 and BG95-M6 do not support eSIM.

3.10. USB Interface

BG95 contains one integrated Universal Serial Bus (USB) interface which complies with the USB 2.0

specification and supports operation at low-speed (1.5 Mbps) and full-speed (12 Mbps) 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 12: Pin Definition of USB Interface

Pin Name Pin No. I/O Description Comment

USB_VBUS 8 AI USB connection detection Typical 5.0 V

USB_DP 9 IO USB differential data (+)

Require differential impedance of

90 Ω

USB_DM 10 IO USB differential data (-)

NOTES