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FIBOCOM NL668-EAU-MiniPCIe-10 Hardware User Manual
Page 24 of 56
3.4.1 USB Interface Definition
Pin Name
I/O
Pin
Description
USB_DM
IO
36
USB differential data (-)
USB_DP
IO
38
USB differential data (+)
Table 3-8 USB Interface
For more information on the USB 2.0 specification, visit http://www.usb.org/home
Note:
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 ohm resistor to USB_DM / DP differential cable;
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 control differential impedance is 90 ohm;
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.
3.5 (U)SIM Interface
MiniPCIe module have (U)SIM card interface, support 1.8V and 3.0V (U)SIM card.
3.5.1 (U)SIM Pin
(U)SIM pin is shown in the following table.
Pin Name
I/O
Pin Num
Description
USIM_VDD
O
8
(U)SIM Power
USIM_DATA
IO
10
(U)SIM Data
USIM_CLK
O
12
(U)SIM Clock
USIM_RST
O
14
(U)SIM Reset
USIM_PRESENCE
I
44
(U)SIM card detect for Hot-swap
Table 3-9 (U)SIM Pin
3.5.2 (U)SIM Interface Circuit
3.5.2.1 (U)SIM Card Conncetor With Detection Signal
(U)SIM design requires the use of (U)SIM card holder (Fibocom recommend: SIM016-8P-220P). We
