L830-EA M.2 Module Hardware User Manual
Page 30 of 45
36
UIM_PWR
O
USIM power supply signal
30
UIM_RESET
O
USIM Reset Signal
32
UIM_CLK
O
USIM clock signal
34
UIM_DATA
I/O
USIM data signal
66
SIM_DETECT I
USIM Plug-in detection signal , 390K resistor will be pulled up
by default.
High level indicates that SIM card is inserted.
Low level indicates that card is not inserted.
5.5.2 USIM Interface Design
5.5.2.1 “Normal Closed” SIM Card Circuit Design
Reference Circuit Design:
Figure 5- 7 Reference Design of “Normally Closed” SIM Card Interface
Normally closed SIM Connector:
1
）
Pull out SIM card, pin 7 and pin 8 will short-circuit .
2
）
Insert SIM card, pin 7 and pin 8 will disconnect.
5.5.2.2 “Normally Open” SIM Circuit Design
Referenced Circuit Design:
