CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Figure 3-17 RI pin signal waveform
Send AT + DISABLEUSB = 1, AT + CSCLK = 1, after the module goes to sleep.
3.7 USIM interface
The CLM920_RC3 module provides a USIM card interface that is compatible with the ISO
7816-3 standard. The USIM card power supply is provided by the internal power manager of
the module and supports 1.8V / 3.0V voltage.
Table 3-15 SIM card signal definition
Pin
Signal name
I/O
Description
13
USIM_PRESENCE
DI
USIM card detection
14
USIM_VDD
PO
USIM card power supply
15
USIM_DATA
IO
USIM card data
16
USIM_CLK
DO
USIM card clock
17
USIM_RST
DO
USIM card reset
3.7.1 USIM card reference circuit
The CLM920_RC3 module does not have its own USIM card slot, users need to design the
USIM card slot on their own interface board. The reference circuit of the USIM card interface
is as follows
：
Figure 3-18 USIM design circuit diagram
