Usim Interface; Usim Pins - Fibocom L850-GL Series Hardware Manual

USB3.0 signals are super speed differential signal lines with the maximum transfer rate of 5 Gbps. So the
following rules should be followed carefully in the case of PCB layout:
USB3.0_TX-/USB3.0_TX+ and USB3.0_RX-/ USB3.0_RX+ are two pairs differential signal lines. The

differential impedance should be controlled as 90Ω.
The two pairs differential signal lines should be parallel and have the equal length. The right angle

routing should be avoided.
The two pairs differential signal lines should be routed on the layer that is adjacent to the ground layer,

and wrapped with GND vertically and horizontally.

3.5 USIM Interface

The L850 module has a built-in USIM card interface, which supports 1.8V and 3V SIM cards.

3.5.1 USIM Pins

The USIM pins description is shown in the following table:
Pin Pin Name
36 UIM_PWR
30 UIM_RESET
32 UIM_CLK
34 UIM_DATA
66 SIM_DETECT
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FIBOCOM L850-GL Series Hardware Guide
Figure 3-17 Reference circuit for USB3.0 interface
I/O Reset Value Description
PO
-
O L
O L
I/O L
I PD
USIM power supply
USIM reset
USIM clock
USIM data, internal pull up(4.7KΩ)
USIM card detect, internal 390K pull-
up.
Active high, and high level indicates
SIM card is inserted; and low level
indicates SIM card is detached.
Type
1.8V/3V
1.8V/3V
1.8V/3V
1.8V/3V
1.8V
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