M10 Hardware Design
M10_HD_V3.0 - 53 -
Module
SIM_VDD
SIM_RST
SIM_CLK
SIM_DATA
SIM_PRESENCE
22R
22R
22R
VCC
RST
CLK IO
VPP
GND
VDD_EXT
10K
100nF SIM_CARD
GND
GND
ESDA6V8V6
GNDPRESENCE
Figure 33: Reference circuit of the 8 pins SIM card
Note: Please do not use “AT+QSIMDET=1,1” which causes to initialize SIM card when Figure
33 circuit is adopted.
If customer does not need the SIM card detection function, keep SIM_PRESENCE open. The
reference circuit using a 6-pin SIM card socket is illustrated as the following figure.
Figure 34: Reference circuit of the 6 pins SIM card
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