User's Manual

H350 LGA Serials Module Hardware User Manual Page of
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24 USIM_CLK O USIM clock signal
23 USIM_IO I/O USIM data signal
28 GND GND USIM ground
27 USIM_CD I
USIM insert detect signal
Low level indicates SIM card is not inserted
High level indicates SIM card is inserted
5.6.2 USIM
5.6.2.1 Normally Closed SIM Circuit Design
Reference Design:
Figure 5- 8 Normally Closed SIM Interface Reference Design
Normally closed SIM:
1）Pull out SIM card, pin 7 and pin 8 are shorted.
2）Plug SIM card, pin 7 and pin 8 are disconnected.