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FIBOCOM L610-LA Series Hardware Guide
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USB_DM/DP differential signal cable is required to be less than 1pF, and a 0.5pF TVS is
recommended.
It is recommended to connect a 0ohm resistor to USB_DM/DP differential line in series.
USB_DM and USB_DP are high-speed differential signal lines, which can achieve the maximum
transmission rate of 480Mbits/s and must follow the rules below in PCB Layout:
USB_DM and USB_DP signal lines control the differential impedance of 90ohm;
USB_DM and USB_DP signal lines shall be parallel and equal in length, and shall avoid
right-angle wiring;
USB_DM and USB_DP signal cables are routed on the signal layer closest to the ground layer,
and the lines shall be wrapped with GND.
3.5 USIM Interface
L610 modules provide USIM interface and support 1.8V and 3.0V SIM.
3.5.1 USIM Pin
USIM pins are shown in the following table:
Pin Name
I/O
Pin
Description
USIM_DATA
I/O
15
USIM/SIM DATA
USIM_CLK
O
16
USIM/SIM Clock Signal
USIM_RESET
O
17
USIM/SIM RESET Signal
USIM_VDD
O
14
USIM/SIM Power
USIM_PRESENCE I
13
Detect USIM/SIM card for Hot-swap
3.5.2 USIM Interface Circuit
3.5.2.1 SIM Card Slot with Detection Signal
USIM/SIM design requires the use of SIM card slot (recommended model: SIM016-8P-220P). It is
recommended to use hot plug slot with SIM detection function.
