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FIBOCOM MC610 Series Hardware Guide 35/70
3.4 USB Interface
MC610 series modules support USB2.0 and are compatible with USB High-Speed (480 Mbits/s) and USB
Full-Speed (12 Mbits/s). For timing sequence and electrical characteristics of USB buses of MC610 series
modules, see "Universal Serial Bus Specification 2.0".
3.4.1 USB Interface Definition
Table 3-9 USB interface
USB differential data bus
USB differential data bus
For more information about the USB Specification 2.0, visit http://www.usb.org/home.
Since the module supports USB 2.0 High-Speed, the equivalent capacitance of the TVS tube on
the USB_DM/DP differential signal line is required to be less than 1 pF, and TVS with capacitance
of 0.5 pF is recommended;
It is recommended to connect serial 0 Ω resistors on the USB_DM/DP differential line;
USB_DM and USB_DP are high-speed differential signal lines with a maximum transmission rate
of 480 Mbits/s. PCB Layout must observe the following rules:
l The control differential impedance of USB_DM and USB_DPUSB_DP signal lines is 90 Ω;
l USB_DM and USB_DP signal lines are required to be equal in length and parallel to avoid
right-angle route;
l USB_DM and USB_DP signal lines are laid in the signal layer nearest to the ground, and
protected by surrounding grounding lines in all directions of the line.
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