Quectel BG96-NA Hardware Design page 37

In order to meet ensurethe integrity of USB data line signal, components R1, R2, R3 and R4 must be
placed close to the module, and also these resistors should be placed close to each other. The extra
stubs of trace must be as short as possible.
In order to ensure the USB interface design corresponding with the USB 2.0 specification, please comply
with the following principles.
 It is important to route the USB signal traces as differential pairs with total grounding. The impedance
of USB differential trace is 90ohm.
 Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It is
important to route the USB differential traces in inner-layer with ground shielding onnot only upper
and lower layers but also right and left sides.
Pay attention to the influence of junction capacitance of ESD protection components on USB data

lines. Typically, the capacitance value should be less than 2pF.
Keep the ESD protection components to the USB connector as close as possible.

NOTE
BG96-NA module can only be used as a slave device.
BG96-NA_Hardware_Design
Figure 17: Reference Circuit of USB Application
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LTE Module Series
BG96-NA Hardware Design