Name: Fibocom L850-GL Series
Brand: Fibocom
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FIBOCOM L850-GL Series Hardware Guide Page 36 of 59

configured in practical application.

3.4.2.1 USB Interface Definition

Pin# Pin Name I/O Description Type

7 USB_D+ I/O USB data plus

0.3---3V,

USB2.0

9 USB_D- I/O USB data minus

0.3---3V,

USB2.0

29 USB3.0_TX- O USB3.0 transmit data minus -

31 USB3.0_TX+ O USB3.0 transmit data plus -

35 USB3.0_RX- I USB3.0 receive data minus -

37 USB3.0_RX+ I USB3.0 receive data plus -

3.4.2.2 USB2.0 Interface Application

The reference circuit is shown in Figure 3-16:

Figure 3-16 Reference circuit for USB 2.0 interface

USB_D- and USB_D+ are high speed differential signal lines with the maximum transfer rate of 480 Mbps,

so the following rules should be followed carefully in the case of PCB layout:

 USB_D- and USB_D+ signal lines should have the differential impedance of 90Ω.

 USB_D- and USB_D+ signal lines should be parallel and have the equal length. The right angle routing

should be avoided.

 USB_D- and USB_D+ signal lines should be routed on the layer that is adjacent to the ground layer,

and wrapped with GND vertically and horizontally.

3.4.2.3 USB3.0 Interface Application

The reference circuit is shown in Figure 3-17:

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Fibocom L850-GL Series Specifications

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