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FIBOCOM NL668-AM Hardware User Manual
Page 31 of 62
3.5 USIM Interface
NL668-AM module has built-in USIM card interface, and supports 1.8V and 3.0V SIM card.
3.5.1 USIM pin
USIM pin is shown in the following table:
Pin name
I/O
Pin
Description
USIM_DATA
I/O
15
USIM/SIM DATA
USIM_CLK
O
16
Clock Signal
USIM_RESET
O
17
RESET Signal
USIM_VDD
O
14
USIM/SIM Power
USIM_PRESENCE
I
13
Detect USIM/SIM card for Hot-swap
Table 3-10 SIM Card Pin
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 (Fibocom recommend: SIM016-8P-220P). We
recommend using hot plug slot with SIM_DECTECT function.
