3.6.1 USIM slot design
The module does not has USIM slot, users need to design USIM slot on their own interface
board.
USIM interface reference design diagram is as follow:
NOTE:
USIM interface line is recommended to choose ON SEMI SMF15C device to do ESD
protection, USIM card peripheral circuit devices should be close to USIM slot.
The SIM card circuit is susceptible and caused no card. The slot should be placed as far
away from the antenna's RF as possible and keep away from the RF line, VBAT and high
speed signal line.
The internal UIM_DATA has been pulled to the USIM_VCC through the 47K resistor, the
outside does not need to pull-up.
USIM_DET is the detection pins of USIM card to detect whether the USIM inserts or does
not insert, the default is high level. When hot plug, it needs this pin to detect the USIM status.
The USIM card and the module’s GND needs to maintain good connectivity, UIM_CLK
GND should be protected independently.
3.6.2 USIM_DET Hot plug reference design
NO.
USIM_DET status
Definition
1
HIGH
SIM inserted
2
LOW
SIM does not inserted
NOTE:
It is recommended to add a diode protection beside the UIM _DET pin.
When a normally closed SIM or a normally open SIM card is used, the detection function
can be set by the AT command. AT+HOSCFG=1,1 (High level when SIM card is insert)/
AT+HOSCFG=1,0(Low level when SIM card is insert)/ AT+HOSCFG=0.0(Hot plug is
disabled)
3.7 GPIO interface
PIN
Signal
I/O
High level
Definition
19
WAKEUP_IN
DI
1.8V
Module sleep control
