Fibocom L830-EB - 3.5 USIM Interface

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L830-EB Hardware User Manual Page 23 of 39
3.5 USIM Interface
The L830 module supports USIM card interface including 1.8V and 3V SIM cards.
3.5.1 USIM Pins
The USIM pins description as shown in the following table:
Pin
Pin Name
I/O
Reset Value
Description
Type
36
UIM_PWR
PO
USIM power supply
1.8V/3V
30
UIM_RESET
O
L
USIM reset
1.8V/3V
32
UIM_CLK
O
L
USIM clock
1.8V/3V
34
UIM_DATA
I/O
L
USIM data, internal 4.7K pull-up
1.8V/3V
66
SIM_DETECT
I
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.
1.8V
3.5.2 USIM Interface Circuit
3.5.2.1 N.C. SIM Card Slot
The reference circuit design for N.C. (Normally Closed) SIM card slot is shown in Figure 3-12:
Figure 3-12 Reference Circuit for N.C. SIM Card Slot