Hardware Guide

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FIBOCOM MC116-NA Series Hardware Guide Page 34 of 63
The length of cable from the module to the (U)SIM card connector shall not exceed 100mm. Longer
cable reduces signal quality.
USIM_CLK and USIM_DATA signals are ground isolated to avoid mutual interference. If it is difficult
to do so, (U)SIM signal needs to be ground protected as a set;
The filter capacitor and ESD device of (U)SIM card signal cable should place close to the (U)SIM
card connector.
Please select equivalent capacitor is 22pF~33pF for ESD device.
USIM_DATA should pull up to USIM_VDD with a 10K resistor.
5.4 USB Interface
5.4.1 USB Pin Definition
Table 5-9 USB pin definition
Pin Name I/O Pin No. Description
USB_DP IO 69
USB differential data bus D+
USB_DM IO 70
USB differential data bus D-
USB_VBUS PI 71
USB Plug detect
For more information about the USB 2.0 specification, please refer to
http://www.usb.org/home
Since the module supports USB 2.0 High-Speed, TVS tube equivalent capacitance on the
USB_DM/DP differential signal cable is required to be less than 1pF, and a 0.5pF capacitance
TVS is recommended.
Connect a 0-Ω resistor to USB_DM / DP differential line to help analyze problems.
USB_DM and USB_DP are high-speed differential signal cables, can achieve the maximum
transmission rate of 480Mbits/s, and must follow the rules below in PCB Layout:
USB_DM and USB_DP signal cable’s control differential impedance is 90Ω.
USB_DM and USB_DP signal cables shall be parallel and equal in length, and avoid the
right-angle route.
USB_DM and USB_DP signal cables are routed on the signal layer closest to the ground layer,
and the cables shall be grounded.
Note: